Coherent light generators – Particular beam control device – Modulation
Patent
1992-01-15
1993-04-06
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Modulation
372 96, 372102, 372 6, 372 19, 385 11, 359341, H01S 310
Patent
active
052009645
ABSTRACT:
Non-linear effects in an optical fiber used for communicating AM signals at high power levels are reduced by increasing the linewidth of the pump laser output signal. The linewidth can be increased by optically broadening the laser output signal by driving an optical angle modulator with broadband electrical noise. The optical signal is then externally modulated with an AM information signal for transmission over an optical link fiber. The optical modulation can be provided using either an FM or PM optical modulator. A desired linewidth can be provided by controlling the optical modulation index during the optical modulation step and/or by controlling the bandwidth of the noise source. Other techniques for broadening a laser output signal, including modulating the signal by a periodic function such as a sine wave, or injecting spontaneous emissions into the laser cavity, are also disclosed.
REFERENCES:
patent: H822 (1990-09-01), Nettleton et al.
patent: 4709417 (1987-11-01), Kuwabara
patent: 5040865 (1991-08-01), Chen et al.
patent: 5134620 (1992-07-01), Huber
patent: 5140456 (1992-08-01), Huber
General Instrument Corporation
Jr. Leon Scott
Lipsitz Barry R.
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