HDTV WDM Optical Fiber Transmission System

Abstract

This paper presents a 10-channel HDTV digital transmission system using wavelength-division multiplexing. We have developed an external-grating-cavity laser diode, made up into a compact module for a holographic diffraction grating and an aspherical lens, that operates at high speed. The optical multiplexer and demultiplexer have a narrow channel spacing of 1.9 nm, low polarization-sensitivity, and low optical crosstalk. We have also developed a new method of digital frequency-division multiplexing that transmits one HDTV signal at 668.25 Mb/s per optic channel. Transmission experiments through 3 km of GI fiber demonstrate its high performance.