UNIT - 1

Light Wave System Components

Q1) Explain optical fiber system.

Q2) Explain Optical fiber as Communication channel.

Q3) Explain optical fiber modes and configurations.

Q4) A fiber has normalized frequency V = 26.6 and the operating wavelength is 1300nm. If the radius of the fiber core is 25µm, compute the numerical aperture.

Q5) Explain mode theory for circular wave guides.

Q6) Explain single mode fiber.

Q7) Write a note on graded index fiber.

Q8) A graded index fiber with a parabolic reflective index profile core has a refractive index at the core axis of 1.5 and relative index difference of 1%. Estimate the maximum possible core diameter which allows single mode operation at a wavelength of 1.3 µm.

Q9) Explain signal degradation in optical fiber.

Q10) Write a note on optical sources.

Q11) Explain the concept of Photo detectors. Mention the common Photo detectors.