US 2002/0118363 A1Published application

Low-coherence reflectometer

AssigneesAndo Electric Co., Ltd., Nippon Telegraph and Telephone Corporation

InventorsFumio Akikuni, Shoichi Aoki, Tetsuo Yano, Tohru Mori, Kazumasa Takada

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Abstract

A photocoupler 3 splits the light from a low-coherence light source 1 into measuring light DL and local oscillator light KL. A photocoupler 5 receives measuring light DL arid is input to an optical circuit 7 to be measured. The photocoupler 5 splits the reflected light RL. A polarization controller 9 controls the state of polarization of the reflected light RL as split by the photocoupler 5. A photocoupler 13 allows local oscillator light KL to be incident on a reflector mirror 16 and splits local oscillator light KL. A photocoupler 11 combines the reflected light RL as controlled in the state of polarization by the polarization controller 9, with the local oscillator light KL.

Claims12

Dependent claims

A low-coherence reflectometer comprising:

a light source;
a first splitter for splitting a light beam from the light source into a first split beam and second split beam;
a second splitter for inputting the first split beam from the first splitter into an optical circuit to be measured, the second splitter for splitting the first split beam reflected on the optical circuit into a third split beam and fourth split beam;
a polarization controller for controlling polarization of the third split light received from the second splitter;
a third splitter for allowing the second split beam from the first splitter to be incident on a reflector, the third splitter for splitting the second split beam reflected on the reflector into a fifth and sixth split beam;
and
a coupling unit for combining the third split beam controlled by the polarization controller with the fifth split beam output from the third splitter.

4 more elements

Dependencies are inferred from the claim text.