Method and apparatus for modulation current regulation for laser

Optical: systems and elements – Deflection using a moving element – Using a periodically moving element

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359181, H04B 1004

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active

050917978

ABSTRACT:
In known modulation current regulators, a low-frequency pilot signal is often superimposed on the digital useful signal and the two superposition products resulting in a light signal are evaluated. Due to the cut-in delay of a laser diode, the preconduction current of the laser diode in laser diode transmitters having transmission rates of at least a few 100 Mbit/s must be set so high that a superposition product only results in the light output signal and, therefore, a regulation of the modulation current is no longer possible in the known manner. For regulating the modulation current given high transmission rates, at least one pulse sequence is periodically inserted into the digital transmission signal or a pulse sequence already contained in the digital transmission signal is evaluated, the pulse sequence being composed of at least one part having a majority of logical one pulses and a part having a majority of logical zero pulses.

REFERENCES:
patent: 4009385 (1977-02-01), Sell
Smith, D. W.; "Laser Level-Control Circuit for High-Bit-Rate Systems Using a Slope Detector", Electronics Letters, vol. 14, No. 4, Nov. 23, 1978, pp. 775-776.

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