Tunable optical narrowband filter using a gain-coupled phase-shift-controlled distributed feedback laser

In this paper, we have proposed and analyzed a new tunable optical narrowband filter using gain-coupled phase-shift-controlled distributed feedback (GC-PSC-DFB) laser diode. Coupled-mode equations are solved by using the transfer matrix method (TMM). The GC-PSC-DFB filters offer a stable single-mode...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics 2005-09, Vol.11 (5), p.913-918
Main Authors: Kian Yong Lim, Low, A.L.Y., Su Fong Chien, Ghafouri-Shiraz, H.
Format: Article
Language:English
Subjects:
Band pass filters
Channels
Deviation
Diode lasers
Distributed feedback (DFB) lasers
Distributed feedback devices
Equations
Gain
gain coupled
Laser feedback
Laser tuning
Mathematical analysis
Narrowband
Optical feedback
Optical filters
Quantum electronics
semiconductor lasers
transfer matrix method
Tunable circuits and devices
tunable optical filters
Tuning
Wavelengths
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Summary:In this paper, we have proposed and analyzed a new tunable optical narrowband filter using gain-coupled phase-shift-controlled distributed feedback (GC-PSC-DFB) laser diode. Coupled-mode equations are solved by using the transfer matrix method (TMM). The GC-PSC-DFB filters offer a stable single-mode bandpass output, similar to that obtained with phase-shifted index-coupled structures. However, GC structures do not suffer from the severe longitudinal spatial hole burning (SHB) that occurs in high-coupling quarter-wave-shifted DFB filters. This SHB can cause multimoded behavior for high-input signal power. Various filter parameters such as wavelength tuning range, side-mode suppression ratio (SMSR), and channel gain deviation have been investigated and discussed. Our results show that the GC DFB structures offer a wider tuning range of 23.3 /spl Aring/ compared with the similar index-coupled DFB structures with nearly steady bandwidth of 12 GHz, while maintaining 41.8-dB constant gain.
ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2005.854151