Direct detection of FSK

Details Direct detection of FSK Direct detection of FSK

1994-05-13

1995-09-19

Moore, David K.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359181, 359182, 372 38, H04B 1004

Patent

active

054521173

ABSTRACT:
A method of controlling a laser in an FSK direct detection system employing a two-path unbalanced interferometer in series with the laser output, the method including the steps of sensing when the system output level reaches a predetermined threshold, and superimposing a fixed amplitude step of drive current on the feedback controlled modulated drive current to the laser. The superimposed fixed amplitude step in the laser drive current causes a phase shift in the interferometer sufficient to cause the interferometer to acquire a fresh interference fringe whenever the interferometer is near to running out of range. The superimposed fixed amplitude step may be synchronized with a data bit transition.

REFERENCES:
patent: 4805235 (1989-02-01), Henmi
patent: 5025487 (1991-06-01), Eichen
King et al. "FSK/IM Scheme For Unrepeatered Optical Systems", IEE Colloquium on `Sources for Very High Bit Rate Optical Communication Systems` (Digest No. 080, pp. 8/1-5).varies.8 Apr. 1992.

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