Abstract

Arrayed low-modulation-distortion laser diodes (LDs) are very attractive light sources for use in high-capacity CATV systems, because their carrier-to-noise ratio (CNR) can be drastically improved by mixing light output launched from each LD separately modulated.¹ A 6-dB CNR improvement can be expected theoretically by using a four-channel LD array. However, it is difficult to realize low-distortion LD arrays, because of a poor production yield for low-distortion DFB-LDs, even for a single LD chip. We have developed low-distortion 1.3-μm partially corrugated waveguide laser diodes^2,3 (PC-LDs), which realize a marked yield improvement, for use in SCM mobile communication systems. This paper reports newly developed multiple-wavelength PC-LD array for use in high-capacity CATV systems. High-yield performance as well as low-distortion characteristics of the PC-LD array are demonstrated.

© 1995 Optical Society of America