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A tunable dispersion compensating MEMS all-pass filter

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6 Author(s)
Madsen, C.K. ; Lucent Technol. Bell Labs., Murray Hill, NJ, USA ; Walker, J.A. ; Ford, J.E. ; Goossen, K.W.
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A tunable dispersion compensating filter based on a multistage optical all-pass filter with a microelectromechanical (MEM) actuated variable reflector and a thermally tuned cavity is described. A two-stage device was demonstrated with a tuning range of /spl plusmn/100 ps/nm, 50-GHz passband and a group delay ripple less than /spl plusmn/3 ps. The device has negligible polarization dependence and is suitable for single or multiple channel compensation. An off-axis, two-fiber package with an excess loss <2 dB/stage avoids the need for a circulator. By cascading four stages, a passband to channel spacing ratio of 0.8 is obtained that allows both 40 Gb/s nonreturn-to-zero (NRZ) and return-to-zero (RZ) signals to be compensated.

Published in:

Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 6 )