Coherent light generators – Particular temperature control
Patent
1998-09-10
2000-04-25
Scott, Jr., Leon
Coherent light generators
Particular temperature control
372 26, 372 6, 372 38, H01S 304
Patent
active
060552522
ABSTRACT:
Techniques for controlling the operation of a laser diode to maintain optimum operating characteristics (i.e., fairly constant output power and extinction ratio) despite the fact that the threshold current and slope efficiency vary greatly over a the desired range of operating temperature. A laser driving circuit includes a bias current generator, a temperature-dependent modulation current generator, and a switching element for switching the modulation current on and off in accordance with a desired input pattern. The modulation current is caused to vary with temperature in a manner that compensates for the fact that the laser diode's slope efficiency varies with temperature.
REFERENCES:
patent: 5604757 (1997-02-01), Liang et al.
patent: 5760939 (1998-06-01), Nagarajan et al.
patent: 5812572 (1998-09-01), King et al.
Document entitled: "MAXIM. Single +5V, Fully Integrated 1.2Gbps Laser Diode Driver," 1995, pp. 1-12; (Maxim Integrated Products, 120 Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600).
Document entitled: "SONY CXB1549Q, Laser Diode Driver, Preliminary," pp. 1-14 (PE98313-PS).
Document entitled: "SONY CXB1558Q-Y, Laser Driver," pp. 1-11 (E04720-PK).
Jr. Leon Scott
Photonic Solutions, Inc.
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