1×N² wavelength-selective switch with two cross-scanning one-axis analog micromirror arrays in a 4-f optical system
Tsai, J.; Sophia Ting-Yu Huang; Hah, D.; Wu, M.C.
Lightwave Technology, Journal of
Volume 24, Issue 2, Feb. 2006 Page(s): 897 - 903
Digital Object Identifier   10.1109/JLT.2005.861915
Summary:A new high-port-count wavelength-selective switch (WSS) has been realized using two cross-scanning one-axis analog micromirror arrays in a 4-f optical system. The number of output ports is increased from N to N², where N is the maximum linear port count limited by optical diffraction. Using surface-micromachined micromirrors with hidden vertical comb drives, large scan angles (>±5° mechanical), low drive voltages (7 V), and high fill factors (> 96.25%) are achieved for both scanning mirrors. Experimental results for WSS are demonstrated using both two-dimensional (2-D) array of discrete collimators and monolithic 2-D collimator array. A fiber-to-fiber insertion loss ranging from 6 to 18 dB and a switching time of <700 μs have been achieved.

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