Apparatus and method for tracking optical wavelength in WDM...

Details Apparatus and method for tracking optical wavelength in WDM... Apparatus and method for tracking optical wavelength in WDM...

2007-08-07

2007-08-07

Li, Shi K. (Department: 2613)

Optical communications

Multiplex

Wavelength division or frequency division

C398S169000

Reexamination Certificate

active

10780132

ABSTRACT:
An optical wavelength tracking apparatus and method in a wavelength division multiplexed (WDM) passive optical network (PON) in which a central office (CO) having a multi-frequency light source is connected to a plurality of optical network units (ONUs) having loop-back light sources through a WDM MUX/DEMUX in a remote node (RN). The power levels of downstream and upstream WDM optical signals are measured. The WDM wavelengths of the multi-frequency light source and the WDM MUX/DEMUX are controlled to be nearly identical in order to minimize the difference between the power levels of the downstream and upstream WDM optical signals.

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patent: 6304350 (2001-10-01), Doerr et al.
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European search report for Application EP 04 01 1315, dated Mar. 21, 2006 (provided by Applicant filed Apr. 13, 2006).

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