| 摘要 |
PROBLEM TO BE SOLVED: To realize a laser module with the use of an existing optical sending circuit for optical communication apparatus using low oscillation threshold lasers, and improve the optical output characteristics at no signal or zero signal time. SOLUTION: A laser oscillation threshold adjusting circuit, having an laser module and an optical transmission circuit in an optical transmission module used for optical communication apparatus, is provided. To adapt a low oscillation threshold laser module 10 to an optical transmission circuit 20 for high oscillation threshold lasers, a resistor 30 is added to connect the anode and cathode of the laser module, and the resistance of the resistor 30 is determined by taking the difference current of a threshold to be raised and the voltage drop between the laser anode and the cathode into consideration.
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