Title :
Fabrication of transmission filters with single or multiple flattened passbands based on chirped Moire gratings
Author :
Chen, L.R. ; Loka, H.S. ; Cooper, D.J.F. ; Smith, P.W.E. ; Tam, R. ; Gu, X.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont., Canada
fDate :
4/1/1999 12:00:00 AM
Abstract :
The fabrication of transmission filters with single or multiple flattened passbands based on chirped Moire gratings is reported. The gratings are fabricated by the dual-exposure of a single chirped phase mask in conjunction with an amplitude mask. The filters have a ripple <0.5 dB in the passband, exhibit an isolation of >12 dB, and have near-constant in-band group delay
Keywords :
band-pass filters; delays; moire fringes; optical communication equipment; optical filters; wavelength division multiplexing; amplitude mask; chirped Moire gratings; dual-exposure technique; isolation; multiple flattened passbands; near-constant in-band group delay; phase mask; ripple; single flattened passbands; transmission filters;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19990406
