[OPTICAL REVIEW Vol. 8, No. 6 (2001) 469-475]
Zero Path-Length Difference Interferometry Using Filter Response of Unbalanced Interferometer to an Amplified Spontaneous Emission Beat Noise Spectrum
Gyeong-il KWEON*, Jung-ho CHOI, Jihoon KANG and Daeyeon KIM
1Optical Amplifier Laboratory, LG Cable Ltd., 1026-6, Hogye-dong, Dongan-gu, Anyang-shi, Kyungki-do, 431-080, Korea
(Received July 2, 2001; Accepted September 11, 2001)
Zero path-length difference interferometry is demonstrated using the filter response of an unbalanced interferometer to the spontaneous/spontaneous beat noise spectrum of an amplified spontaneous emission source. The method is applicable to path-length differences ranging from a few centimeters to several kilometers.
Key words : interferometry, interferometer, zero path-length difference, optical path-length difference, amplified spontaneous emission, photocurrent, intensity noise, relative intensity noise, beat noise