CIRCUIT FOR HIGH-SPEED DRIVING OF OPTICAL SOURCE BY OPTICAL CMOS TECHNOLOGY

摘要

PURPOSE: To provide a circuit which enables a high speed drive of a laser diode and efficiently operates at a speed meeting requirements given by an optical fiber communication system to avoid interference between an optical source drive current and bias current. ;CONSTITUTION: When a data transmitting source feeds a drive current to the input I of a cascade of CMOS inverters, this cascade can be driven by the cascade of inverters having characteristics about the size of p- and n-type CMOS transistors at a speed enough for the input capacity of transistors SM. When the voltage is at a low logic level on the input I, the gate of MS goes to a high logic level to cut off the p-type transistor and only a bias current fed from MP flows to a terminal L. The current flowing to this terminal L is given by addition of the bias current to a modulating current fed from MM, and both currents depend on a voltage fed to terminals M and P but are mutually independently adjustable.;COPYRIGHT: (C)1995,JPO