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

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

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. 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. 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. Which feature of an optical isolator makes it attractive to use with optical amplifier?

View solution

Q. Magneto-optic devices can be used to function as isolators.

View solution

Q. How many implementation methods are available for optical isolators?

View solution

Q. A device which is made of isolators and follows a closed loop path is called as a ____________

View solution

Q. The commercially available circulators exhibit insertion losses around ________________

View solution

Q. A combination of a FBG and optical isolators can be used to produce non-blocking optical wavelength division add/draw multiplexers.

View solution