Optical frequency control system and method

Details Optical frequency control system and method Optical frequency control system and method

1996-10-31

1998-07-07

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359181, 359187, 372 32, H04B 1004

Patent

active

057777730

ABSTRACT:
Method and apparatus for controlling the frequency of a laser in an optical transmission system which involves applying a frequency modulation to the laser, determining an amplitude modulation present in the signal downstream of the laser and attributable to the frequency modulation, and discriminating a portion of the amplitude modulation which is substantially in phase quadrature with the applied frequency modulation. The frequency of the laser is controlled on the basis of the discriminated quadrature portion. An optical component downstream of the laser may have a response which converts FM to AM. The response and the frequency output of the laser can be locked to one another, without errors caused by unwanted AM in the transmitted signal modulation frequency.

REFERENCES:
patent: 5347392 (1994-09-01), Chen et al.
patent: 5373385 (1994-12-01), Darcie et al.
patent: 5510922 (1996-04-01), Naito
Rev. Sci. Instrum. 61(9) Sep. 1990 pp. 2478-2480 "Frequency Stabilization of a Directly Modulated Laser" by Lee et al.

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