In-line optical wavelength reference and control module

Details In-line optical wavelength reference and control module In-line optical wavelength reference and control module

1996-01-16

1998-07-07

Bacares, Rafael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

358 18, H04J 1402

Patent

active

057777632

ABSTRACT:
An apparatus and method for use in an optical system. An in-line optical wavelength reference and control module (WRCM) is inserted in series with an optical fiber signal path between an input fiber and an output fiber. The WRCM includes an input lens, a multi-element grating and an output lens. The input lens couples an input optical signal from the input fiber into the multi-element grating. The multi-element grating includes low-efficiency gratings which reflect portions of the input optical signal having different predetermined characteristics to different detectors of a detector array, while transmitting the remaining portions of the input optical signal to the output lens. The output lens couples the transmitted portions of the optical signal back onto the optical signal path. The WRCM may thus be placed directly in series with an optical signal path. The predetermined characteristics may be selected optical signal wavelengths, such that the WRCM can be used to monitor the optical signal path for the power level and/or drift of a given system wavelength. The multi-element grating may also include one or more highefficiency gratings suitable for delivering substantially all of the optical signal power of a given wavelength division multiplexed (WDM) channel signal to or from a selected node in an optical network system.

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C. Mao et al., "Laser Wavelength Stabilization Using Holographic Filters," Accuwave Corporation, 1651 19th Street, Santa Monica, CA 90404.

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