Wavelength stability circuit

Details Wavelength stability circuit Wavelength stability circuit

1996-09-24

1999-01-19

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359191, H04B 10145, H04B 1004

Patent

active

058619755

ABSTRACT:
It is the object of the invention to provide a wavelength stability circuit used in a WDM optical transmission system, in which the spacing of wavelengths between adjacent optical signals are always so controlled as to keep a prescribed value. The two optical signals with different wavelengths are respectively generated by two laser diodes and multiplexed by an optical coupler. A portion of the multiplexed optical signals is supplied to an optical heterodyne detection circuit, where the spacing of the wavelengths between the two optical signals is detected. The spacing of the wavelengths between the optical signals is converted into an electrical signal by an O/E converter and a frequency counter, and the electrical signal is compared with a standard voltage in a comparator. The spacing of the wavelengths between the two optical signals is always controlled and stabilized by a control circuit and keeps a prescribed value, where the lasing wavelength of one of the two laser diodes is controlled in accordance with the result of comparison of the comparator.

REFERENCES:
patent: 5146358 (1992-09-01), Brooks
patent: 5365361 (1994-11-01), Noll et al.
patent: 5546210 (1996-08-01), Chaplyvy et al.
patent: 5570182 (1996-10-01), Nathel et al.
patent: 5589970 (1996-12-01), Lyu et al.
patent: 5663822 (1997-09-01), Fee

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