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Electron beam direct-write tunable polymeric waveguide grating filter

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3 Author(s)
W. H. Wong ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China ; E. Y. B. Pun ; K. S. Chan

We report a tunable electron beam direct-write polymeric waveguide Bragg grating filter based on a negative tone epoxy, The waveguide filter, with a 5-mm-long first-order grating, exhibits a transmission peak of -27 dB and a 3-dB bandwidth of /spl sim/0.8 nm, and there is an excellent agreement between experimental data and simulation results. The temperature response of the filter is also characterized. The rate of change of refractive index dn/dT is /spl sim/ -1.8 /spl times/ 10/sup -4///spl deg/1C at 1550-nm wavelength for both transverse electric and transverse magnetic polarizations, and the rate of change of peak wavelength d/spl lambda//dT is /spl sim/ -0.14 nm//spl deg/C. The tuning performance is comparable to other grating devices fabricated using multiple processing steps.

Published in:

IEEE Photonics Technology Letters  (Volume:15 ,  Issue: 12 )