A 7X6 OPTICAL-FIBER GRATING DEMULTIPLEXER-MULTIPOSITION SWITCH FOR 0.64-0.88 MU-M BAND

An optical fiber grating demultiplexer-multiposition switch having sev en demultiplexing channels and six position-switching channels is demo nstrated. This device consists of a unique fiber array in which 42 out put fibers are aligned radially around an input fiber, a single gradie nt-index (GRIN)-rod lens and a rotatable blazed reflection grating. In this device, seven demultiplexing channels can be switched to six dif ferent directions by rotating blazed reflection grating. Therefore, th is device can realize total transmission channels of 42. The device ha d a working band of 0.64-0.88 mu m, a channel separation of 35-42 nm a nd a 3 dB band width of 18-22 nm. The deviations of center wavelengths among the switching channels were suppressed less than 3 nm.