OPTICAL FIBER MEASURING APPARATUS

Japanese Patent JP3686390

B2

PROBLEM TO BE SOLVED: To accurately obtain a change in time of the intensity of return light in an optical fiber.
SOLUTION: The optical fiber measuring apparatus comprises: an acoustic optical element 22 for switching continuous light to zero-order light and high- order light according to the signal level of a pseudo random pulse signal for outputting; a multiplexer 24 for multiplying the zero-order light and high-order light outputted from the acoustic optical element for applying to the optical fiber as measurement light; a detector 27 for multiplying return light from the optical fiber and continuous light from the light source for executing optical heterodyne detection; a signal extraction section 30 for extracting a signal that changes with time for indicating a change in time of the intensity of return light from the detection signal outputted from the detector; a correlator 34 for calculating the correlation between the signal that changes with time and the pseudo random pulse signal for outputting as a correlation signal; and a characteristic calculation section 36 for calculating the characteristics of the optical fiber from the correlation signal.

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Masaya Shimizu
Tatsuyuki Maki
Shinji Hoshino
Kazuhiko Ishiguro

JP2002140343A

August 24, 2005

May 15, 2002

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Anritsu Co., Ltd.
NEC

G01M11/02; G01M11/00; (IPC1-7): G01M11/02; G01M11/00

JP9033389A
JP9026376A

Takehiko Suzue
Sadao Muramatsu
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura

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