Submarine observation apparatus and submarine observation...

Optical communications – Diagnostic testing – Determination of communication parameter

Reexamination Certificate

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C398S030000, C398S033000, C398S037000, C398S181000, C398S104000, C398S105000, C398S107000, C398S173000, C398S177000, C398S079000, C398S195000, C398S174000, C398S175000, C398S176000, C359S333000, C359S341100, C359S337000, C359S341300, C359S341400

Reexamination Certificate

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07437070

ABSTRACT:
In each of a plurality of submarine observation apparatus (1to n), a branching unit (63) branches fixed-wavelength light (λ1) from an incoming wavelength-multiplexed light signal. An observation signal modulating unit (64) modulates the intensity of the branched fixed-wavelength light (λ1) with observation information multiplexed by an observation signal multiplex unit (61). A combining unit (65) combines light signals (λ2) to (λn) passing through the branching unit (63) and the fixed-wavelength light (λ1a) modulated by the observation signal modulating unit (64) into a composite light signal, and outputs it to an optical fiber (12a). Therefore, in each of the plurality of submarine observation apparatus (1to n), there is no necessity for providing a wavelength-division-multiplexing-transmission optical transmitter which requires high wavelength stability.

REFERENCES:
patent: 5535037 (1996-07-01), Yoneyama
patent: 6604870 (2003-08-01), Hørlyck
patent: 7103275 (2006-09-01), Fujiwara
patent: 2005/0259264 (2005-11-01), Munehira et al.
patent: 7-202804 (1995-08-01), None

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