Laser modulation controller using additive and amplitude modulat

Details Laser modulation controller using additive and amplitude modulat Laser modulation controller using additive and amplitude modulat

1994-05-11

1995-02-28

Scott, Jr., Leon

Coherent light generators

Particular beam control device

Modulation

372 38, 372 31, 372 32, 372 29, H01S 310

Patent

active

053944160

ABSTRACT:
A laser modulation controller (10) provides laser modulation control by DC bias (54) to a laser (22) with a first control tone (32), amplitude modulating (70) a non-return to zero (NRZ) input working signal (18) to be converted to light output with a second control tone (30), detecting the first control tone from a portion of the light output of the laser (88, 26) as a third signal (58) which is proportional to laser gain, detecting the second control tone (30) from a portion of the light output of the laser as a fourth signal (60) which occurs only if the laser is being modulated in or below the lasing threshold region, and substantively combining the third (58) and fourth (60) signals to generate a fifth signal (84) for use as a control of the amplitude of the NRZ working signal (18).

REFERENCES:
patent: 4243951 (1981-01-01), Wolkstein et al.
patent: 4796266 (1989-01-01), Banwell et al.
patent: 4924470 (1990-05-01), Ries

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