H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1
H04B 10/04 (2006.01) H01S 5/0683 (2006.01) H04B 10/155 (2006.01) H01S 5/042 (2006.01) H01S 5/062 (2006.01)
Patent
CA 2029718
ABSTRACT OF THE DISCLOSURE 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 ill the digital transmission signal is evaluated, the pulse sequence being composed of at least one part having a majority of logical one pulses and of a part having a majority of logical zero pulses.
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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