Abstract
Wavelength division multiplexing (WDM) in fiber-optic communication is an attractive way to increase transmission capacity and to give flexibility in system design.1 To realize multiplexers (including demultiplexing devices), two typical methods have been studied. One uses wavelength-dependent reflection and transmission. The other uses wavelength-dependent angular deviation. Small wavelength-dependent reflection-transmission multiplexers have been developed5 as an extended version of micro-optic couplers.3 As angular- dispersive multiplexers, two-channel multiplexers have been reported4 in which an isolated reflection grating is optically combined with a graded-index rod.
© 1979 Optical Society of America
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