Abstract

Subcarrier multiplexing^1,2 (SCM) has become a very promising technique for fiber-optic loop applications, such as CATV and microcellular mobile communication systems.³ In such systems, low-intermodulation-distortion laser diodes (LDs) are required to ensure a high carrier-to-noise ratio in analog transmission. Thus far, −85-dBc third-order-intermodulation-distortion (IMD₃) values have been obtained from 1.3-μιη multiple-quantum-well (MQW) distributed-feedback (DFB) LDs.⁴ Furthermore, it is important to clarify the distortion mechanism and to establish a technology that can stably provide low-distortion LDs with high yield to allow widespread use of SCM systems.

© 1994 Optical Society of America