This article lists 150+ Optical Fiber Communication MCQs for engineering students. All the Optical Fiber Communication Questions & Answers given below include a solution and link wherever possible to the relevant topic.
In a communication system, the internet has become a deriving force. Every day we are sending around 12 million email messages, 0.5 million voice mail messages, 37 million people are logging on the net, and around 100 million additional internet users are adding year by year, all these things happening only because of optical communication.
Nowadays we are using the internet facilities to provide multiple numbers of services in various domains. Day by day the number of applications is being increased and to serve all these growing applications lots of bandwidth is required. We can operate multiple numbers of applications with an available bandwidth which is in terms of terahertz.
There are two types of optical fibers are there they are step-index and graded-index optical fiber. The bandwidth of the fiber-optic is in THz whereas the copper wire communication bandwidth is in several MHz. The bandwidth of copper wire communication is very low compared to fiber-optic communication.
An optical fiber cable acts as a transmission medium in optical communication which is made up of glass or plastic material. An optical fiber function as a cylindrical ridged waveguide and the cylindrical waveguide operates at optical frequencies which are in the terra hertz’s range.
1). Which is the transmission medium between the transmitter and receiver?
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2). In microwave technology which one is acting as a transmission medium?
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3). In optical communication _________ acts as a transmission medium
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4). An optical fiber is made up of _______ material
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5). An optical fiber function as ________
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6). Does optical fiber communication mean transferring information in the form of light?
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7). The bandwidth in fiber optical communication is represented in terms of ________
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8). An optical communication operates within a range of __________
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9). If bandwidth in optical fiber communication converted in terms of frequencies then those frequencies are the range of ________
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10). In optical fiber communication, the information is transfer in the form of light with the help of ________
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11). The light signal consists of _______
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12). The audio frequency range is from _______
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13). The wavelength of audio is about _________
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14). An optical frequency rage starts from _______
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15). The technology which is used in first-generation communication is gallium arsenide semiconductor?
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16). In a first-generation communication system, the operating region is near _____
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17). In a first-generation communication system, the bit rate is about _____
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18). In a first-generation communication system, the repeater spacing is in the range of _____
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19). In a second-generation communication system, the bit rate is about _____
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20). In a second-generation communication system, the repeater spacing is in the range of _____
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21). The wavelength of second-generation communication system is around __________
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22). In a third-generation communication system, the bit rate is about _____
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23). In a third-generation communication system, the repeater spacing is in the range of _____
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24). The wavelength of a third-generation communication system is around __________
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25). In a fourth-generation communication system, the bit rate is about _____
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Optical Fiber Communication Important Questions With Hints
26). In a fourth-generation communication system, the repeater spacing is in the range of _____
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27). The wavelength of fourth-generation communication system is around __________
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28). Which technique is used in a fourth-generation communication system?
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29). Which technique is used in a fifth-generation communication system?
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30). The bandwidth of copper wire communication is very low compared to fiber optic communication?
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31). How many types of optical fibers are there?
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32). What is the standard form of OTDR?
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33). In the fifth-generation communication system, the bit rate is about _____
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34). In a fifth-generation communication system, the repeater spacing is in the range of _____
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35). The wavelength of fifth-generation communication system is around __________
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36). An optical time-domain reflectometer used to find ___________
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37). What is the standard form of SONET?
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38). What is the standard form of SDH?
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39). The SONET functions are based on ______ system
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40). How many devices are there in SONET?
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41). What is the standard form of STS?
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42). The SONET regenerators function as which layer?
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43). How many rows does the SONET frame consist of?
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44). The first three bytes in the SONET frame are _____
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45). The transport overhead in the SONET frame divided into how many categories?
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46). In the SONET frame out of nine rows, three rows are ________
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47). In the SONET frame out of nine rows six rows are ________
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48). In the SONET frame 87 bytes of 9 rows are ________
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49). The SONET frame consists of _________
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50). The section overhead in administrative overhead is for _______
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Optical Fiber Communication Important Questions for Quiz
51). The SONET frame period is around ___________
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52). The line overhead in the SONET frame provides ______
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53). The data rate of the SONET frame is around ________
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54). ______ are the applications of SONET
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55). What is the standard form of DWDM?
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56). What are the major issues in optical communication?
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57). The problem of signal attenuation in optical communication solved by _______
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58). What are the components of DWDM?
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59). How many types of DWDM networks are there?
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60). ________ is an advantage of DWDM
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61). What is the standard form of OADM?
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62). How many types of OADM networks are there?
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63). What is the standard form of WDM?
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64). ___________ are the components of WDM
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65). What are the technologies available in the WDM network?
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66). ___________ are the important features of WDM network
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67). An optical circulator is a ______ terminal device
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68). An optical isolator is a ______ terminal device
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69). The birefringent wedge in an optical isolator is made up of a _______
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70). The faradays rotator in an optical isolator, the rotation is based on _______ parameter
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71). How many types of optical couplers are there?
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72). The evanescent wave and twistedpair couplers are two ____________ types of coupler
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73). In which type of coupler the optical fibers are twisted?
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74). How many types of ruman amplifiers are there?
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75). In which ruman amplifier the pump signal and input signal wavelength are mixed in an optical cable?
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Optical Fiber Communication Important Questions for Exams
76). In the ruman amplifier the amplification depends on _______
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77). The fiber in EDFA is heavily doped with _________
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78). An EDFA works based on which concept?
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79). The EDFA operates in __________ band
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80). The EDFA used in ___________
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81). Optical amplifiers are of ______ types
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82). In an optical communication system, the system performance can be identified by using ______ analysis
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83). The budget analysis which is used to determine the optical link dispersion limitation is known as ________
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84). How many basic elements are there in the rise time budget analysis?
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85). Which rise time budget analysis depends on the source of light and driving circuit?
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86). ____________ rise time based on photodetector
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87). The point of point link of optical fiber communication system consists of ________
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88). The channel parameters based on optical fiber in point to point link __________
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89). What are the transmitter parameters in point to point link optical fiber communication system?
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90). The performance of the digital receiver in an optical system can be evaluated by ________
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91). The gain in pin photodiode is always __________
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92). The pin photodiode has ______ noises
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93). The avalanche photodiode have _______
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94). Why the output current is very less in the case of conventional and pin photodiodes
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95). To obtain high current and high gain _______ is used
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96). Which material is used in avalanche photodiode?
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97). ____________ is an advantage of avalanche photodiode
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98). The resistivity range in PIN photodiode is from __________
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99). What is the main disadvantage of pin photodiode?
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100). The ratio of the number of newly generated charge carriers by the number of incident photons is known as _________
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101). The number of electron-hole pair generated with respect to the number of photons observed is known as _________
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102). The ratio of detector output to detector input is known as ___________
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103). When light is not falling on photodetector then it is known as __________
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104). The photodiode is a_________ device
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105). What is the working principle of a photodiode?
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Read more about Diodes
106). Why connectors are used?
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107). What are the major criteria behind the connectors?
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108). The fiber splices are used to connect __________ optic cables permanently
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109). What are the basic requirements of fiber splices?
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110). How many types of techniques are there in fiber splicing?
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111). What is the main advantage of fusion splicing?
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112). What are the disadvantages of fusion splicing?
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113). In which type of splicing the fiber are aligned and then they are locked in position using various positioning devices?
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114). How many types of splices are there in mechanical splicing?
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115). What are the losses generated when we do fiber-to-fiber joints?
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116). Which lensing scheme of optical fiber made up of epoxy or adhesive material?
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117). The distributed feedback laser is used to generate signal with ___________
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118). What is the standard form of LASER?
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119). The first laser built by ________
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120). _________ are the properties of laser
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121). In case of laser ______
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122). The spectral width in LED’s is _______
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123). In laser ______
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124). The edge-emitting LED consists of _______
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125). The main disadvantage of using edge-emitting LED is _________
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Optical Fiber Communication Important Questions for Interviews
126). _______ is an important property of surface-emitting LED
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127). What is the disadvantage of using surface-emitting LEDs?
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128). If a PN junction is made from two mixture of the same type of atoms then it is called as ___________
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129). If a PN junction is made from two dissimilar layers of atoms then it is called as ___________
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130). The homojunction LED is also called as _______
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131). The heterojunction LED is also called as _______
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132). The quantum efficiency of a LED is defined as a ratio of _________
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134). Why quantum efficiency of LED is very less?
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135). The irradiance of LED is defined as a ______
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Read more about LED
136). The mode of optical fiber are categorized into _____
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137). In a single mode of optical fiber _____
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138). In a multi-mode of optical fiber _______
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139). In multimode step-index fiber the index will change from __________
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140). In multimode graded-index fiber the index will change from __________
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141). In a multimode graded-index fiber the fibers are available with bandwidth from ________
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142). In a multimode step-index fiber the signal propagates with _________
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143). In a multimode graded-index fiber the signal will follow _________
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144). The dimensions of core for multimode step-index fiber is around _______
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145). The dimensions of core for multimode graded-index fiber is around _______
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146). The ratio of the velocity of light in the air by the velocity of light in a medium is known as _________
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147). When ray enters from denser to rarer medium with the refracted angle of 90 degrees the angle of incident is known as ________
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148). How many types of rays are there in an optical fiber?
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149). The fiber fabrication for mass production has the following steps?
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150). How many methods are there in fiber fabrication?
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Optical Fiber Communication Important MCQ’s
151). What is the standard form of OVPO?
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152). What is the standard form of VAD?
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153). _______ are the correct steps that we have to follow in the OVPO fiber fabrication process
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154). Which fabrication method has less pollution?
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155). What are the advantages of vapor-phase axial deposition?
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156). Holey fiber is the nickname of ____________ fabrication
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157). The photonic crystal fiber categorized into ______
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158). Which fabrication method is also known as micro-structured fiber?
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159). What are the advantages of the double crucible method for fiber fabrication?
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160).What are the disadvantages of the double crucible method for fiber fabrication?
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161). In glass fibers ________
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162). In plastic fibers _________
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163). What is the standard form of MCVD?
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164). The core of the plastic fiber is made up of __________
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165). The core of the glass fiber is made up of __________
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166). How many channels does T1 multiplexer consist of _______
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167). The window range of the first fiber optic is around _______
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168). The window range of the second fiber optic is around _______
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169). The operating wavelength of the first fiber optic window is round ___________
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170). The operating wavelength of the second fiber optic window is round ___________
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171). The attenuation is expressed in ______
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172). How many factors on which attenuation is depending?
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173). Dispersion factor in attenuation is categorized in to ________
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174). What is the standard form of PCVD?
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175). The window range of the third fiber optic is around _______
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Optical Fiber Communication Important MCQ’s with Hints
176). The operating wavelength of the third fiber optic window is round ___________
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177). Which one is a type of dispersion?
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178). What is the major factor that is responsible for material absorption loss?
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179). The fiber bending loss are of ________
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180). If banding of fiber radius is more than the radius of core of fiber then this banding is known as ____________
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181). _________ are the linear scattering types
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182). ________ are the non-linear scattering types
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183). What is the standard form of PCFF?
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184). In which scattering the light from the sun scattered in the atmosphere to give the sky color blue?
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185). Which scattering takes place in a forward or backward direction?
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186). When the scattered photons lose their energy then it is known as _________
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187). When the scattered photons gain their energy then it is known as ________
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188). _________ are the types of intramodal dispersion
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189). The dispersion losses are of ________
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190). What are the optical fiber measurements?
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191). What are the major components in carrier wave communication?
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192). The communication channel in carrier wave communication is ________
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193). What do we require for a reliable communication system?
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194). What are the signals that are used to modulate high-frequency electromagnetic waves?
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195). The bit rate requirement for telecommunication is around?
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196). The bit rate requirement for standard TV?
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197). The bit rate requirement for HMTV?
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198). The data rate of microwave communication (mobile network) ________
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199). What are the advantages of a fiber optic communication system over a conventional communication system?
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200). The optical modulation bandwidth of diode laser is around _________
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Read more about Optical Fibers
FAQs
What is the range of fiber optics communication Mcq? ›
Explanation: A multimode step index fiber has a core diameter range of 100 to 300μm. This is to facilitate efficient coupling to inherent light sources.
What is optical fiber PDF? ›An optical fiber is a cylindrical dielectric waveguide made of low-loss materials such as silica glass. It has a central core in which the light is guided, embedded in an outer cladding of slightly lower refractive index (Fig. 8.0-l).
Which of the following Fibres does not used nowadays for optical Fibre communication system? ›D. Explanation: single mode fibers are used to produce polarization maintaining fibers which make them expensive. also the alternative to them are multimode fibers which are complex but accurate. so, single-mode fibers are not generally utilized in optical fiber communication.
What is optical fiber communication system? ›Fiber-optic communication is a method of transmitting information from one place to another by sending pulses of infrared light through an optical fiber. The light is a form of carrier wave that is modulated to carry information.
Which fiber is used for long distance transmission? ›Single Mode fibers are used for high speed data transmission over long distances. They are less susceptible to attenuation than multimode fibers.
How many types of optical fibers are there? ›There are basically three types of optical fiber: single mode, multimode graded index, and multimode step-index. They are characterized by the way light travels down the fiber and depend on both the wavelength of the light and the mechanical geometry of the fiber.
Where is optical fibre used? ›Optical Fibres uses in Medical industry
Because of its extremely thin and flexible nature, it is used in various instruments to view internal body parts by inserting into hollow spaces in the body. It is used as lasers during surgeries, endoscopy, microscopy and biomedical research.
Optical fiber uses the optical principle of "total internal reflection" to capture the light transmitted in an optical fiber and confine the light to the core of the fiber.
What are the different types of fibers? ›There are 2 different types of fiber -- soluble and insoluble.
What are the 2 types of fiber optic cable? ›There are two types of fibre optic cables – multimode and single-mode. Multimode fibre is capable of carrying multiple light rays (modes) at the same time as it has varying optical properties at the core. Single-mode fibre has a much smaller core size (9 microns).
What is the maximum speed of fibre optic cable? ›
Fibre optic: up to 10Gbps (at a data transfer rate of up to 10 billion bits per second) Copper cable: 25-300 Mbps (at a data transfer rate of up to 300 million bits per second) DSL: 0.5-75 Mbps.
Why is fibre optic used? ›Fiber optic cables are commonly used because of their advantages over copper cables. Some of those benefits include higher bandwidth and transmit speeds. Fiber optics is used for long-distance and high-performance data networking.
Which type of fibre has the highest model dispersion? ›8) Which type of fiber has the highest modal dispersion? Modal dispersion depends on the length of the path i.e. the longer the path is, the higher the model dispersion will be. Step-index multimode has the highest modal dispersion.
What is optical Fibre made of? ›Optical fibers are made up of silica-based glass or plastic that are insulators and therefore have no currents flowing in them. As a result, fibers are immune to electromagnetic interference.
What are the classifications of optical Fibre? ›- Step index-single mode fibres.
- Graded index-Single mode fibres.
- Step index-Multimode fibres.
- Graded index-Multimode fibres.
Fiber optic cable (also referred to as optical fiber cable) transmits data as pulses of light through flexible, optically pure fibers of glass or plastic. It has become a popular choice for Ethernet networking and telecommunications applications thanks to its fast data transmission speeds over long distances.
Who invented optical fibre? ›Charles Kuen Kao is known as the “father of fiber optic communications” for his discovery in the 1960s of certain physical properties of glass, which laid the groundwork for high-speed data communication in the Information Age.
What is the size of fiber? ›Fiber Size
The size of the optical fiber is commonly referred to by the outer diameter of its core, cladding and coating. Example: 50/125/250 indicates a fiber with a core of 50 microns, cladding of 125 microns, and a coating of 250 microns. The coating is always removed when joining or connecting fibers.
Fibers that are soluble, viscous and fermentable seem to be the healthiest, by far. Resistant starches are also incredibly healthy. Good sources of healthy fibers include vegetables, fruits, oats, legumes, nuts, dark chocolate, avocados, chia seeds and various other foods.
What is the capacity of fiber optic cable? ›Cable technology currently supports approximately 1,000 Mbps of bandwidth, while fiber optic internet supports speeds of up to 2,000 Mbps. At 1,000 Mbps, you can download a 2-hour HD movie in about 32 seconds. At 2,000 Mbps, it takes approximately 17 seconds to download a 2-hour HD movie.
What is fiber optic speed? ›
Fiber-optic internet, commonly called fiber internet or simply “fiber,” is a broadband connection that can reach speeds of up to 940 Megabits per second (Mbps), with low lag time. The technology uses fiber-optic cable, which amazingly can send data as fast as about 70% the speed of light.
What are 5 applications of fiber optics? ›- Internet. Fibre optic cables transmit large amounts of data at very high speeds. ...
- Computer Networking. ...
- Surgery and Dentistry. ...
- Automotive Industry. ...
- Telephone. ...
- Lighting and Decorations. ...
- Mechanical Inspections. ...
- Cable Television.
Optical instruments are based on optics. They use mirrors and lenses to reflect and refract light and form images. The light microscope and telescope use convex lenses and mirrors to make enlarged images of very tiny or distant objects. A camera uses a convex lens to make a reduced image of an object.
What is the V number? ›The V number is a dimensionless parameter which is often used in the context of step-index fibers. It is defined as. where λ is the vacuum wavelength, a is the radius of the fiber core, and NA is the numerical aperture.
What is critical angle in optical fiber? ›critical angle, in optics, the greatest angle at which a ray of light, travelling in one transparent medium, can strike the boundary between that medium and a second of lower refractive index without being totally reflected within the first medium.
What is optical fiber and its types? ›Types of optical fiber
There are two primary types of fiber, each of which has a different application. These are multimode (MM) fiber, which has a large core and allows for multiple paths through the fiber, and single-mode (SM) fiber, which has only one path, through a much smaller core.
Insoluble fiber, soluble fiber, and prebiotic fiber are all essential to our health and well-being. Here's why — and which foods have them. There are three forms of fiber, and we need some of each to thrive.
What are two other names for fiber? ›- grain.
- thread.
- tissue.
- cilia.
- cord.
- fibril.
- filament.
- grit.
Natural fibres can be classified according to their origin. The vegetable, or cellulose-base, class includes such important fibres as cotton, flax, and jute. The animal, or protein-base, fibres include wool, mohair, and silk. An important fibre in the mineral class is asbestos.
Which range does an optical frequency range start from? ›The optical spectrum is generally defined to encompass electromagnetic radiation with wavelengths in the range from 10 nm to 103 μm, or frequencies in the range from 300 GHz to 3000 THz (Fig. 1).
Is the range of signal frequencies within which a fiber optic component link or network will operate? ›
Typically 4% of the incident light. Expressed in dB relative to incident power. Backscattering: The scattering of light in a fiber back toward the source, used to make OTDR measurements. Bandwidth: The range of signal frequencies or bit rate within which a fiber optic component, link or network will operate.
Which limits the maximum distance between the optical fibre transmitter and receiver? ›Explanation: Attenuation along with dispersion and the conductor size are some of the factors that limit the maximum distance between the optical transmitter and the receiver.
What is the frequency limit of optical fibre? ›40 GHz is the frequency limit of an optical fiber.
Which light is used in optical fiber? ›Laser light is used for optical fiber communications for the simple reason that it is a single wavelength light source. Sunlight or the light emitted by a light bulb is a mixture of many different wavelengths of light.
Why is it called 1310 and 1550? ›Typically multi-mode glass fibers use light at 850 nm - 1300nm, referred to as “short wavelength” and single-mode fiber operates at 1310, or 1550 nm, called “long wavelength”. These wavelengths are used because they have the lowest attenuation rate.
What is critical angle in optical fiber? ›critical angle, in optics, the greatest angle at which a ray of light, travelling in one transparent medium, can strike the boundary between that medium and a second of lower refractive index without being totally reflected within the first medium.
What are three applications of fiber optics? ›- Internet. Fibre optic cables transmit large amounts of data at very high speeds. ...
- Computer Networking. ...
- Surgery and Dentistry. ...
- Automotive Industry. ...
- Telephone. ...
- Lighting and Decorations. ...
- Mechanical Inspections. ...
- Cable Television.
Optical fibres works on the principle of total internal reflection. When light ray strikes at the internal surface of optical fibre cable called such that incidence angle is greater than critical angle, then incident light ray reflects in the same medium and this phenomenon repeats.
What type of fiber-optic cable is used for internet? ›Fiber optic cable (also referred to as optical fiber cable) transmits data as pulses of light through flexible, optically pure fibers of glass or plastic. It has become a popular choice for Ethernet networking and telecommunications applications thanks to its fast data transmission speeds over long distances.
Which is the most commonly used optical transmitter? ›Laser diode transmitters These fibre optic transmitters are more expensive and tend to be used for telecommunications links where the cost sensitivity is nowhere near as great. The output from a laser diode is generally higher than that available from a LED, although the power of LEDs is increasing.
Why is single mode better than multimode? ›
In singlemode fiber, all light from a pulse travels at about the same speed and arrives at roughly the same time, eliminating the effects of modal dispersion found in multimode fiber. This supports higher bandwidth levels with less signal loss over longer distances.
What are the main elements of an optical transmitter? ›The main elements of an optical transmitter consist of an electrical interface, a data encoder/modulator, a laser, and an optical interface.
What is bandwidth of optical fiber? ›Multimode optical fiber can readily transmit high bandwidth data over long distances; a typical bandwidth-distance product for multimode fiber is 500 MHz/km, so a 500 m tether can transmit 1 GHz (several Gbits/second, with appropriate modulation).
What is optical bandwidth? ›An optical bandwidth can be the width of a frequency range which can somehow be handled by an optical element or photonic device.
How do fiber optics transmit data? ›Fiber-optic cables transmit data via fast-traveling pulses of light. Another layer of glass, called “cladding,” is wrapped around the central fiber and causes light to repeatedly bounce off the walls of the cable rather than leak out at the edges, enabling the single to go farther without attenuation.