A two-dimensional digital micromirror device- (DMD-) based add–drop filter is introduced for dense wavelength-division multiplexed applications. Features of the filter include polarization-insensitive operation, low interchannel cross talk parallel processing, and a fault-tolerant design. Experiments include evaluation of a parallel-beam-fed interchannel cross-talk with a 25-beam mask and a three-color (red, green, blue) filter operational test that indicates output-port average switching optical signal-to-noise and multiwavelength cross-talk ratios of 24 dB. The DMD-based average optical loss for the filter is −2.85 dB for visible-light free-space operation, whereas a −8.88-dB optical loss is measured for a fiber-coupled filter operating at 1319 nm.
© 1998 Optical Society of America
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(060.4230) Fiber optics and optical communications : Multiplexing
(060.4510) Fiber optics and optical communications : Optical communications
Nabeel A. Riza and Sarun Sumriddetchkajorn, "Fault-Tolerant Dense Multiwavelength Add-Drop Filter With a Two-Dimensional Digital Micromirror Device," Appl. Opt. 37, 6355-6361 (1998)