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Wavelength‐tunable optical filters with phase‐shifted DFB structures
Author(s) -
GhafouriShiraz H.,
Lew S. H.
Publication year - 1997
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19971005)16:2<119::aid-mop15>3.0.co;2-3
Subject(s) - wavelength , optics , materials science , phase (matter) , microwave , grating , filter (signal processing) , optical power , optical filter , optoelectronics , physics , laser , telecommunications , engineering , quantum mechanics , electrical engineering
A new wavelength‐tunable optical filter which is based on a phase‐shift‐controlled distributed feedback structure with two phase shifts along its active layer has been studied, in particular, the effects of phase shifts on tuning range, peak power transmissivity, and side‐mode suppression ratio (SMSR). The analysis indicates that when ϕ 1 =ϕ 4 =π/2, the filter wavelength tuning range is 22.1 Å for the grating coupling coefficient κ=6/ mm while maintaining almost constant transmissivity (gain) of more than 35 dB. The filter SMSR ranges from 11.1 to 25.4 dB. The results for asymmetric values of ϕ 1 and ϕ 4 are also given. © 1997 John Wiley & Sons, Inc. Microwave Opt Technol Lett 16: 119–122, 1997.