Suppression of noise and distortion in fiber-optic systems

Details Suppression of noise and distortion in fiber-optic systems Suppression of noise and distortion in fiber-optic systems

1992-05-22

1995-07-04

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

372 28, 372 32, 372 26, 359194, H01S 310, H01S 313

Patent

active

054305691

ABSTRACT:
Noise and distortion due to scattering and reflection in a fiber-optic communications system are suppressed by modulating the optical frequency of (chirping) a laser light source to broaden the spectrum of the laser light output. The broader spectrum spreads the noise produced by an unchirped source over a broader band. A noise and distortion suppression system includes a chirp signal generator coupled to the signal path of an RF input signal carrying information to modulate the laser optical output. In some cases, the frequency of the chirp generating signal may result in second-order intermodulation products falling within the information band. In such cases, the RF input signal is predistorted to offset the expected distortion products.

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