Adaptive equalizer for analog optical signal transmission

Details Adaptive equalizer for analog optical signal transmission Adaptive equalizer for analog optical signal transmission

1994-07-25

1995-12-05

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359161, 359180, 372 32, H04B 1004

Patent

active

054734606

ABSTRACT:
An adaptive equalizer (also called a laser interface) for generating an electrical modulating signal for use by a laser to modulate an optical data signal. The laser has a non-linear modulation response pattern such that the optical data signal comprises a primary data signal and a plurality of harmonic distortion products. The adaptive equalizer operates by generating a correction electrical signal having a frequency equal to a frequency of one of the harmonic distortion products (this harmonic distortion product is nulled by operation of the adaptive equalizer). The adaptive equalizer detects the phase and amplitude of the harmonic distortion product. Then, the adaptive equalizer phase shifts the correction electrical signal in accordance with the detected phase such that the correction electrical signal and the harmonic distortion product are conjugately matched. The adaptive equalizer amplifies the phase shifted correction electrical signal in accordance with the detected amplitude such that the phase shifted correction electrical signal and the harmonic distortion product are equal in amplitude. Then, the amplified and phase shifted correction electrical signal is combined with an electrical data signal to form the electrical modulating signal.

REFERENCES:
patent: 4811422 (1989-03-01), Kahn
patent: 5119392 (1992-06-01), Childs
patent: 5161044 (1992-11-01), Nazarathy
patent: 5321543 (1994-06-01), Huber
patent: 5321710 (1994-06-01), Cornish
patent: 5361156 (1994-11-01), Pidgeon

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