介绍了光器件在粗波分复用系统中的应用，并与密集波分复用器件进行了比较，论述了这些器件在城域粗波分复用系统中的应用优势，指出该器件的进一步研发方向。关 键 词 粗波分复用; 城域网; 密集波分复用; 光器件Abstract This paper introduces the applications of optical devices in coarse wavelength division multiplexing system, comparing with that of dense wavelength division multiplexing system, obtains the advantages over coarse wavelength division multiplexing system, points out the RD direction further of coarse wavelength division multiplexing device at last.Key words coarse wavelength division multiplexing; metropolitan area network; dense wavelength division multiplexing; optical device