Optical communications – Diagnostic testing – Determination of communication parameter
Reexamination Certificate
2005-02-18
2008-10-14
Phan, Hanh (Department: 2613)
Optical communications
Diagnostic testing
Determination of communication parameter
C398S030000, C398S033000, C398S037000, C398S181000, C398S104000, C398S105000, C398S107000, C398S173000, C398S177000, C398S079000, C398S195000, C398S174000, C398S175000, C398S176000, C359S333000, C359S341100, C359S337000, C359S341300, C359S341400
Reexamination Certificate
active
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
Asakawa Kenichi
Fujieda Tasuku
Goto Hideki
Kawaguchi Katsuyoshi
Mikada Hitoshi
Japan Agency for Marine-Earth Science and Technology
Mitsubishi Denki & Kabushiki Kaisha
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Phan Hanh
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