Method and apparatus for using on-off-keying using laser relaxat

Details Method and apparatus for using on-off-keying using laser relaxat Method and apparatus for using on-off-keying using laser relaxat

1995-12-29

1998-09-15

Bacares, Rafael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359184, 372 25, 372 28, H04B 1004

Patent

active

058087702

ABSTRACT:
An optical communications system for transmission of optical signals using relaxation oscillation subcarrier, on-off keying modulation of the optical signals. Relaxation oscillation subcarrier on-off keying improves the signal-to-noise ratio of a receiver receiving the modulated optical signals and the data rate of the optical signal. A modulation device generates relaxation oscillations by pulsing a driving current for a transmitter between a first level below a threshold current and a second level above the threshold current. The optical communication system can further include a fiber optic link between the transmitter and the receiver. The optical communications system can further incorporate multiple frequency shift keying. The modulation device and modulation scheme can be used in all digital optical communications systems using a pulsed laser diode.

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patent: 5646774 (1997-07-01), Takara et al.
patent: 5659568 (1997-08-01), Wang et al.

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