Optics: measuring and testing – By light interference – Using fiber or waveguide interferometer
Patent
1999-05-21
2000-12-12
Kim, Robert
Optics: measuring and testing
By light interference
Using fiber or waveguide interferometer
356478, G01B 902
Patent
active
061606278
ABSTRACT:
An optical fiber Mach-Zehnder interferometer optical filter is disclosed. The filter includes a stabilization light source for varying a first wavelength of a light signal for stabilizing a Mach-Zehnder interferometer, first and second optical fiber couplers for receiving an optical signal from the stabilization light source and an optical signal of a second wavelength different from a first wavelength inputted from an input port and dividing into two parts having the same intensity for thereby forming a Mach-Zehnder interferometer, a polarization controller connected with one side of the first optical fiber coupler for controlling a polarization of the interfered light of the interferometer, first and second wavelength division multiplex optical couplers connected with the second optical fiber coupler for separately outputting a first wavelength optical signal and a second wavelength optical signal, an optical fiber phase modulator connected with the other side of the first optical fiber coupler for varying the length of the optical fiber in accordance with a fed-back phase difference, and a stabilization circuit for receiving two optical signals of the first wavelength from the first and second wavelength division multiplex optical couplers and feeding back the phase difference to the optical fiber phase modulator for thereby implementing a constant optical path difference of the interferometer.
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Ahn Joon Tae
Jeon Min Yong
Kim Kyong Hon
Lee El Hang
Lee Hak Kyu
Electronics and Telecommunications Research Institute
Kim Robert
LandOfFree
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