Submarine observation apparatus and submarine observation system
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United States of America Patent
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Oct 14, 2008
Grant Date -
Nov 24, 2005
app pub date -
Feb 18, 2005
filing date -
May 20, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In each of a plurality of submarine observation apparatus (1 to n), a branching unit (63) branches fixed-wavelength light (.lamda.1) from an incoming wavelength-multiplexed light signal. An observation signal modulating unit (64) modulates the intensity of the branched fixed-wavelength light (.lamda.1) with observation information multiplexed by an observation signal multiplex unit (61). A combining unit (65) combines light signals (.lamda.2) to (.lamda.n) passing through the branching unit (63) and the fixed-wavelength light (.lamda.1a) 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 (1 to n), there is no necessity for providing a wavelength-division-multiplexing-transmission optical transmitter which requires high wavelength stability.
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