Overview; Principle Of Operation - OptoTest OP831 Instruction Manual

OP831

Overview

The OP831 offers an economical approach for bidirectional insertion loss
measurements for either singlemode cables or multimode cables. For the multimode
testing the OP831 is equipped with a 850nm LED, a 1300nm LED or a switched
850nm/1300nm dual LED source.
The source for the singlemode configuration consists of a dual wavelength laser with
1310nm and 1550nm wavelengths. For all models the power meter is equipped with
a fiber terminated InGaAs detector. The internal 2x2 switch routes the light in either
A-B direction or B-A direction.
The OP831 also can be combined with a 2xN optical switch for the testing of
bidirectional insertion loss on multi-fiber cables, cables harnesses or qualification
testing on a series of cables.

Principle of Operation

Single Cable Bidirectional Operation
OP831 Bidirectional Insertion Loss
LED
Laser
OPM
Multifiber Bidirectional Operation
OP831 Bidirectional Insertion Loss
LED
Laser
OPM
2x2 switch
A
2x2 switch
B
3 of 15
A
reference
cables
B
cables under test
2 xN
Switc h
(A sid e )
cable
under
test
2 xN
Switc h
(B sid e )