ADS equivalent circuit of direct modulated high speed DFB lasers

摘要

A rate equation-based model of MQW semiconductor lasers, has been developed describing power and chirp dynamics. The equations are implemented using an equivalent circuit approach, exploiting the analogy between rate equations and a Kirchoff current balance equation at a capacitor node. Current and voltages across the circuit components are equivalent to the main elements of the rate equations. This solution offers different advantages like the possibility to study the parasitic effects and the opportunity to integrate an high-speed laser model with an IC driver model in the same simulation environment. The model can be easily implemented in any circuit simulator (SPICE, Cadence, Agilent EESoft ADS). All parameters have been derived from measurements on real DFB devices. The model was used to improve static and dynamic performances of InGaAsP MQW-DFB laser 10Gb/s operations, as well as to study the problem of interfacing laser and IC driver. This optimization gave contributions to the realization of uncooled (up to 95℃ chip temperature) DFB lasers directly modulated at 10 Gb/s for optical transceivers in 10Gb-Ethernet networks.