Q. It is a passive device which allows the flow of optical signal power in only one direction and preventing reflections in the backward direction.

View solution

Q. An FBG is developed within a fiber core having a refractive index of 1.30. Find the grating period for it to reflect an optical signal with a wavelength of 1.33 μm.

View solution

Q. A number of three-port single-mode fiber couplers are used in the fabrication of a ladder coupler with 16 output ports. The three-port couplers each have an excess loss of 0.2 dB along with a splice loss of 0.1 dB at the interconnection of each stage. Determine the excess loss.

View solution

Q. A _____________ coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output.

View solution

Q. Calculate the splitting loss if a 30×30 port multimode fiber star coupler has 1 mW of optical power launched into an input port.

View solution

Q. How many manufacturing methods are used for producing multimode fiber star couplers?

View solution

Q. A four-port FBT coupler has 60 μW optical power launched into port one. The output powers at ports 2, 3, 4 are 0.0025, 18, and 22 μW respectively. Find the split ratio?

View solution

Q. A four-port multimode fiber FBT coupler has 50 μW optical power launched into port 1. The measured output power at ports 2,3 and 4 are 0.003, 23.0 and 24.5 μW respectively. Determine the excess loss.

View solution

Q. Couplers insertion loss is same as that of excess loss.

View solution

Q. Which is the most common method for manufacturing couplers?

View solution

Q. How many fabrication techniques are used for 3 port fiber couplers?

View solution

Q. ________ couplers combine the different wavelength optical signal onto the fiber or separate the different wavelength optical signal output from the fiber.

View solution

Q. The optical power coupled from one fiber to another is limited by ____________

View solution

Q. How many types of multiport optical fiber couplers are available at present?

View solution

Q. Optical fiber couplers are also called as ________________

View solution

Q. It is a device that distributes light from a main fiber into one or more branch fibers.

View solution

Q. When considering source-to-fiber coupling efficiencies, the ________ is an important parameter than total output power.

View solution

Q. GRIN-rod lens connectors have loss characteristics that are independent of the modal power distribution in the fiber.

View solution

Q. Which of the following factors does not cause divergence of the collimated beam from a GRIN-rod lens?

View solution

Q. The majority of the GRIN-rod lenses have diameters in the range of ____________

View solution