STUPIDSID
1 (a)
Enlise the advantage of optical fibers,compared to the usage of a copper cables in the communication.
6 M
1 (b)
With relevent diagrams,explain the different types of optical fibers,considering the number of the modes and material composition of the core.
8 M
1 (c)
Light traveling in air strikes a glass plate at an angel ?133°,where &theta1 is measured between the incoming ray and glass surface. If the refracted and reflacted beams make an angel of 90° with each other,what is the refractive index of the glass?What is the critical angle?
6 M
2 (a)
Explain the mechanisms which cause absorption in the optical fibers.mention the measured which can reduce this type of single degradation .
6 M
2 (b)
Prove that,delay differnce between the axial ray and extreme meridional ray is \[ \delta T_s\cong \frac{Ln_1\Delta}{c} \]
8 M
2 (c)
A 6km optical link consists of multicode step-index fiber,with a core RI of 1.5 and relative index differnce of 1%. Estimate,rms pulse broadening due to intermodal dispersion on the link
Maximum bit rate that may be obtained without substational errors on the link assuming only intermodal disapersion
Maximum bit rate that may be obtained without substational errors on the link assuming only intermodal disapersion
6 M
3 (a)
Draw and expalin the cross -sectional view of a typical GaAlAs double heterostructure LED,along with the energy band diagrams and variation in RI profile.
10 M
3 (b)
What is quntum efficiency?How are the 'responsivity' and 'quantum efficiency' realted?
4 M
3 (c)
A given silicomn avalanche photodiode has a quantum efficiency of 65% at a wavelength of 900nm.Suppose 0.5?w of optical power produces a multiplied photocurrent of 10?A,find the primary photocurrent and the multiplication factor.
6 M
4 (a)
List and sketch the different types spiciling techniques and connectors.
8 M
4 (b)
What are the priciple requirements of a good connector design?
6 M
4 (c)
A single mode fiber has a normalized frequency V=2.40, a core RI n1=1.47,a cladding RI of n2=1.465 and a core diameter of 9?m.Find the inseration loss of a fiber joint,if the lateral offset is 1?m.Also find the loss,if there is an angular misalignment of 1° at a 1300nm wavelenghth.
6 M
5 (a)
Expalin with a neat digram,the basis section and operation of an optical receiver.
6 M
5 (b)
Brifly explain the 'quntum limits'
4 M
5 (c)
Dervie the equation for the perfomance fidelity of an analog receiver.substains that for large optical signals.SNR represents the quantum limit for receiver sensitivity
10 M
6 (a)
With a relvent diagram,discuss the subcarrier multiplexing techniques
6 M
6 (b)
Discuss the various parameters involved in optical link power budget,with the relvent equation.
6 M
6 (c)
write shorts note on:
Mode-parition noise
Charping
Mode-parition noise
Charping
8 M
7 (a)
describe the operational principles ofWDM ,depictim the implmentation of a typical WDM networks containg various types of optical amplifires
8 M
7 (b)
Explain brifly the working of thin -film resonant cavity fiter.what is the application ?
6 M
7 (c)
What is MEMS technology?with an example,explain a MEMS actuation method.
6 M
8 (a)
with relevent schematics diagram,explain the three possible configuration of a EDFA
6 M
8 (b)
Discuss the physical layer aspects os SONET,expalning the basic structure of an STS-L SONET frame
6 M
8 (c)
What is the difference between fixed OADM and ROADM ?list the features of ROADM.
8 M
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