Optical communication system utilizing light emitting diode

Details Optical communication system utilizing light emitting diode Optical communication system utilizing light emitting diode

H - Electricity

04

B

325/1

H04B 10/155 (2006.01)

Patent

CA 1087690

ABSTRACT OF THE DISCLOSURE An optical communication system wherein light intensity modu- lation with no carrier is performed using a light emitting diode of which the characteristic curve of the drive signal current vs. optical output power changes with changes in the frequency of the drive signal. The modulation degree at frequencies higher than a predetermined frequency exceeding the thermal response frequency of the light emitting diode is kept larger than the modulation degree at frequencies lower than the thermal response frequency. This is done by using an emphasis circuit during modulation and a de-emphasis circuit during demodulation.

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