Deck 10: Fiber Splicing Techniques and Requirements

Question 1

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

A)smooth and oval end faces
B)smooth and square end faces
C)rough edge faces
D)large core diameter

Answer 1

smooth and square end faces

Question 2

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

A)diamond
B)sapphire
C)tungsten carbide
D)copper

Answer 2

copper

Question 3

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

A)mechanical splicing
B)fusion splicing
C)melting
D)diffusion

Answer 3

fusion splicing

Question 4

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

A)microprocessor torches
B)ox hydric burners
C)electric arc
D)gas burner

Question 5

Average insertion losses as low as _________ have been obtained with multimode graded index and single-mode fibers using ceramic capillaries.

A)0.1 db
B)0.5 db
C)0.02 db
D)0.3 db

Question 6

_____________ are formed by sandwiching the butted fiber ends between a V-groove glass substrate and a flat glass retainer plate.

A)springroove splices
B)v-groove splices
C)elastic splices
D)fusion splices

Question 7

Mean splice insertion losses of 0.05 dB are obtained using multimode graded index fibers with the Springroove splice.

Question 8

Alignment accuracy of the order ___________ is obtained using the three glass rod alignment sleeve.

A)0.23 ?m
B)0.15 ?m
C)0.05 ?m
D)0.01 ?m

Question 9

In case of multiple fusion, splice losses using an electric arc fusion device with multimode graded index fiber range from

A)0.01 to 0.04 db
B)0.19 to 0.25 db
C)0.12 to 0.15 db
D)0.04 to 0.12 db

Question 10

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

A)mechanical splicing
B)fusion splicing
C)melting
D)diffusion

Question 11

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

A)pre-fusion
B)diffusion
C)crystallization
D)alignment

Question 12

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

A)pre-fusion
B)diffusion
C)self-alignment
D)splicing

Question 13

Mean splice insertion losses of 0.05 dB are obtained using multimode graded index fibers with the Springroove splice.

Question 14

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

A)numerical aperture
B)radiance of an optical source
C)coupling efficiency
D)angular power distribution

Question 15

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

A)optical fiber coupler
B)optical fiber splice
C)optical fiber connector
D)optical isolator

Question 16

Optical fiber couplers are also called as ________________

A)isolators
B)circulators
C)directional couplers
D)attenuators

Question 17

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

A)two
B)one
C)four
D)three

Question 18

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

A)numerical apertures of fibers
B)varying refractive index of fibers
C)angular power distribution at source
D)number of modes propagating in each fiber

Question 19

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

A)3-port
B)2*2-star
C)wdm
D)directional

Question 20

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

A)one
B)two
C)three
D)four

Question 21

The most common method for manufacturing couplers is ____________

A)wavelength division multiplexing
B)lateral offset method
C)semitransparent mirror method
D)fused bi-conical taper (fbt) technique

Question 22

Couplers insertion loss is same as that of excess loss.

Question 23

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

A)0.22 db
B)0.33 db
C)0.45 db
D)0.12 db

Question 24

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

A)42%
B)46%
C)52%
D)45%

Question 25

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

A)two
B)one
C)three
D)five