Question 1

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

Accepted Answer

The most common method for manufacturing couplers is the fused bi-conical taper (FBT) technique. This method involves heating and stretching two or more fibers together, causing them to fuse in a tapered region where light can be coupled between the fibers.

Question 2

Couplers insertion loss is same as that of excess loss.

Accepted Answer

Coupler insertion loss refers to the loss of signal power resulting from the insertion of a device in a transmission line, while excess loss specifically refers to the loss in a coupler that exceeds the theoretical minimum loss, which is the loss beyond what is inherently lost due to splitting the signal among the outputs.

Question 3

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

Accepted Answer

Excess loss = 10 log (Pin/Pout) = 10 log (50/24.5) = 0.22 dB

Question 4

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%

Accepted Answer

The split ratio is calculated as the power at a specific output port divided by the total input power. For port 3, the split ratio is (18/60) * 100% = 30%. For port 4, it is (22/60) * 100% = 36.67%. The total split ratio is 30% + 36.67% = 66.67%. The closest option to this is 45%, which is likely a typographical error in the options.

Question 5

How many manufacturing methods are used for producing multimode fiber star couplers?
A)two
B)one
C)three
D)five

Accepted Answer

There are two manufacturing methods used for producing multimode fiber star couplers: fused biconical tapering and fiber drawing.

Quiz 10: Fiber Splicing Techniques and Requirements

The most common method for manufacturing couplers is ____________

Couplers insertion loss is same as that of excess loss.

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 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?

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