OPTICAL FIBER COMMUNICATION

Where Beauty of Light and Semiconductor Devices mixed together to transformed the History of Communication

Technology .

Unit 4 (OFC)-Part-2Connection Losses

Kalyan Acharjyakalyan.acharjya@gmail.com

kalyan5.blogspot.in

10/7/2016 3

Sorry, I opened the lock without prior permission taken from the

original owner. Some images used in this presentation contents are

copied from Book’s Fiber Optics & Optoelectronics By R.P. Khare and

some websites without permission.

Only Original Owner has full rights reserved for copied images.

This PPT is only for fair academic use.Kalyan Acharjya

Connection Losses

• Extrinsic Losses

– Loss Due to Fresnel Reflections

– Fiber to Fiber Misalignment Losses

– Losses Due to other Factors

• Intrinsic Losses (Not Compatible)

– The Core Diameter

– NA (The Relative index Difference)

– The Refractive Index Profile

Loss General Expression

L (Due to factors) =-10Log (Base 10) η

Where η is Coupling Efficiency

Fresnel Reflections

Fiber to Fiber Misalignment Losses

Fiber to Fiber Misalignment Losses

Fiber to Fiber Misalignment Losses

Eta (Long)=[1-DEL X NA/4an]

Fiber to Fiber Misalignment Losses

Extrinsic Losses Due to other Factors

• Non Flatness of end Surfaces

• Dust

• Joint Losses

Intrinsic Losses

Intrinsic Losses

Intrinsic Losses• Core Diameter Mismatch

• NA Mismatch

Intrinsic Losses

• Mismatch Index Profile

Thank Youkalyan5.blogspot.in

Solve It!

• Two compatible multimode SI fiber are jointedwith lateral offset of 10% of the core radius.The RI of the core of each fiber 1.5. Calculatethe insertion loss at the joint when-

– There is small air gap.

– An index matching fluid is inserted between thefibers ends.