Q. A GaAs optical source having a refractive index of 3.2 is coupled to a silica fiber having a refractive index of 1.42. Determine Fresnel reflection at interface in terms of percentage.

View solution

Q. A particular GaAs fiber has a Fresnel reflection magnitude of 17.6% i.e. 0.176. Find the power loss between the source and the fiber?

View solution

Q. Two joined step index fibers are perfectly aligned. What is the coupling loss of numerical aperture are NAʀ= 0.26 for emitting fiber?

View solution

Q. Two joined graded index fibers that are perfectly aligned have refractive indices αʀ = 1.93 for receiving fiber αᴇ = 2.15 for emitting fiber. Calculate the coupling loss.

View solution

Q. How many types of misalignments occur when joining compatible fiber?

View solution

Q. Losses caused by factors such as core-cladding diameter, numerical aperture, relative refractive index differences, different refractive index profiles, fiber faults are known as ____________

View solution

Q. A step index fiber has a coupling efficiency of 0.906 with uniform illumination of all propagation modes. Find the insertion loss due to lateral misalignment?

View solution

Q. A graded index fiber has a parabolic refractive index profile (α=2) and core diameter of 42 μm. Estimate an insertion loss due to a 2 μm lateral misalignment when there is index matching and assuming there is uniform illumination of all guided modes only.

View solution

Q. Determine coupling efficiency if the misalignment loss in a graded index fiber is 0.102.

View solution

Q. In a single mode fiber, the losses due to lateral offset and angular misalignment are given by 0.20 dB and 0.46 dB respectively. Find the total insertion loss.

View solution

Q. The intrinsic loss through a multimode fiber joint is independent of direction of propagation.

View solution

Q. A permanent joint formed between two different optical fibers in the field is known as a ____________

View solution

Q. How many types of fiber splices are available?

View solution

Q. The insertion losses of the fiber splices are much less than the Fresnel reflection loss at a butted fiber joint.

View solution

Q. What is the main requirement with the fibers that are intended for splicing?

View solution

Q. In score and break process, which of the following is not used as a cutting tool?

View solution

Q. The heating of the two prepared fiber ends to their fusing point with the application of required axial pressure between the two optical fibers is called as ____________

View solution

Q. Which of the following is not used as a flame heating source in fusion splicing?

View solution

Q. The rounding of the fiber ends with a low energy discharge before pressing the fibers together and fusing with a stronger arc is called as ____________

View solution

Q. _____________ is caused by surface tension effects between the two fiber ends during fusing.

View solution