| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical transmission circuit and optical communication system capable of making a communication speed high. <P>SOLUTION: An optical transmission circuit includes, e.g.: a laser diode LD1; a temperature/optical detection circuit block PTDET_BK for detecting a temperature or optical output power of the LD1 and outputting a control signal S_CLTo; a laser driver circuit LDV1a for driving the LD1; and a pre-driver circuit PDV1a positioned on a pre-stage of the laser driver circuit LDV1a. The PDV1a includes: a variable amplifying circuit VAMPp; and a variable offset circuit VOF coupled to output of the variable amplifying circuit VAMPp; wherein an offset amount by the VOF is controlled according to the S_CLTo. By the offset amount by the VOF, nonlinear characteristics of the optical output power in the LD1 are compensated. <P>COPYRIGHT: (C)2011,JPO&INPIT |
