Abstract
Small-tilt micromirror-based 232 fiber optic switch array structures are proposed using fixed mirrors and fiber interconnections. A multiwavelength 232 fiber optic switch based on this small-tilt micromir- ror is experimentally demonstrated. The key innovation in this architec- ture is the use of a specially located fixed mirror to form a symmetric 2 32 retroreflective switching structure. These 2 32 fiber optic switch struc- tures can also provide a fault-tolerant design using a macropixel ap- proach. A two-dimensional digital micromirror device (2D-DMD) from Texas Instruments (TI) designed to operate in the visible band is used to represent the small-tilt micromirrors in our experimental demonstration. Multiwavelength switch operation is characterized by changing the oper- ating wavelength of the tunable laser. The measured average optical coherent crosstalk is 222 dB with 60.9 dB fluctuation over 40 nm, lim- ited by the on-off ratio of the 2D-DMD. The measured average optical loss is 14.8 dB at a 1.55-mm operating wavelength, limited by the visible wavelength design TI 2D-DMD, three-port optical circulators, fiber adapt- ers, and free-space-to-fiber coupling efficiency. © 2000 Society of Photo- Optical Instrumentation Engineers. (S0091-3286(00)02002-X)
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