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Optical communications module

  • US 5,677,779 A
  • Filed: 02/28/1995
  • Issued: 10/14/1997
  • Est. Priority Date: 07/01/1994
  • Status: Expired due to Fees
First Claim
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1. An optical communications module, comprising:

  • a transmitting/receiving section which sends a transmitted signal to a transmission path as an optical signal and receives an optical signal from said transmission path; and

    a drive section, which applies said transmitted signal to the transmitting/receiving section and reproduces said received optical signal applied from the transmitting/receiving section as a received electrical signal,wherein said transmitting/receiving section includes a laser diode that outputs the optical signal transmitted to the transmission path and a photo diode for monitoring the optical signal output from the laser diode, and said drive section includes a threshold control circuit which controls a bias current of said laser diode so that an optical noise output from said laser diode, which is detected by said photodiode, is maximized, thereby causing the bias current value of the laser diode to be equal to and track a threshold current value.

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