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Optical Fiber Communication Question & Answers

May 26, 2021 By WatElectronics

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?

Hint
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?

Hint
59). How many types of DWDM networks are there?

Hint
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?

Hint
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 _______

Hint
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?

Hint
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?

Hint
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?

Hint

Optical Fiber Communication Important Questions for Exams

76). In the ruman amplifier the amplification depends on _______

Hint
77). The fiber in EDFA is heavily doped with _________

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78). An EDFA works based on which concept?

Hint
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

Hint
83). The budget analysis which is used to determine the optical link dispersion limitation is known as ________

Hint
84). How many basic elements are there in the rise time budget analysis?

Hint
85). Which rise time budget analysis depends on the source of light and driving circuit?

Hint
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 _______

Hint
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?

Hint
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 _________

Hint
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?

Hint
107). What are the major criteria behind the connectors?

Hint
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?

Hint
113). In which type of splicing the fiber are aligned and then they are locked in position using various positioning devices?

Hint
114). How many types of splices are there in mechanical splicing?

Hint
115). What are the losses generated when we do fiber-to-fiber joints?

Hint
116). Which lensing scheme of optical fiber made up of epoxy or adhesive material?

Hint
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?

Hint
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?

Hint
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?

Hint
150). How many methods are there in fiber fabrication?

Hint

Optical Fiber Communication Important MCQ’s

151). What is the standard form of OVPO?

Hint
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?

Hint
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?

Hint
191). What are the major components in carrier wave communication?

Hint
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?

Hint
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?

Hint
200). The optical modulation bandwidth of diode laser is around _________

Hint
Read more about Optical Fibers
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