Frequency Selectivity in Directly Modulated Distributed Feedback Laser Transmission Operation Using an Impedance Match Tuning Network

Abstract

A demonstration of the effect of tuning components on a directly modulated distributed feedback laser (DFB) high-frequency performance is shown in this paper. A network based on three inductors and a microstrip line is used to impedance match the parasitic reactance of a laser diode within a tuning bandwidth. The matching and transmission performance of the laser under these conditions is compared with a radio frequency network simulation that include the intrinsic model of the DFB laser with its internal parasitic reactance, and the added external microstrip components.Index Terms-DFB laser, electro-optical transfer function, laser model.

Dynamic Device Characteristics and Linewidth Measurement of InGaN/GaN Laser Diodes

“…Using calculated values for series resistance of the device, the parasitic capacitance was found to be 7.7 pF. High speed operation (>10 GHz) requires the parasitic capacitance to be an order of magnitude lower [46], as well as a reduction in series resistance. The intrinsic 3 dB bandwidths increase with bias current, and intrinsic bandwidths up to 5.87 GHz were found for the device at 55 mA, suggesting 10 Gbit/s direct modulation may be possible.…”