Optical transmission device

Details Optical transmission device Optical transmission device

2008-07-29

2008-07-29

Chan, Jason (Department: 2613)

Optical communications

Multiplex

Wavelength division or frequency division

C398S083000

Reexamination Certificate

active

07406262

ABSTRACT:
An optical transmission device improved in quality and reliability of OADM function and permitting configuration of highly-flexible, economical OADM networks. A wavelength tunable filter variably selects a wavelength according to a control frequency. A filter controller applies the control frequency to the filter while scanning wavelength over an entire signal bandwidth, to detect, from a reference wavelength monitor signal supplied thereto, a reference control frequency which permits the filter to select a reference wavelength and according to which wavelength is matched. On receiving a wavelength selection request, the controller obtains a target control frequency from the reference control frequency and the position of a target wavelength relative to the reference wavelength, and applies the obtained frequency to the filter. A reference wavelength filter transmits the reference wavelength therethrough. A light-receiving element monitors the transmitted reference wavelength to generate the monitor signal.

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British Office Action dated Aug. 10, 2006 citing the above-referenced and two references already of record.

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