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Proceedings Paper

Single and coupled silicon Fabry-Perot filters for WDM channel monitoring
Author(s): Giuseppe Cocorullo; Francesco G. Della Corte; Mario Iodice; Ivo Rendina
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Paper Abstract

Operation and management of Wavelength Division Multiplexing (WDM) systems require the monitoring of optical channel frequency and power. In this paper we propose a simple and low-cost solution for tracking the frequency of WDM channels, based on the thermo-optic tuning of single or coupled-cavities Fabry-Perot silicon optical filters. The fabricated structures are single-cavity filters exhibiting, thanks to a suitable coating stack on both cavity sides, high finesse and narrow bandwidth. Moreover, the free spectral range is large compared to the channel spacing, allowing the monitoring of one carrier frequency at a time. By means of a heater we change the cavity refractive index and move the transmission peaks, thus scanning the WDM frequency set. In particular, we demonstrate the possibility to resolve up to seven 50-GHz-spaced channels, with a crosstalk of -10 dB, at wavelengths around 1550 nm. Better performances, in terms of resolvable channels and cross-talk can be obtained by using two coupled-cavities, having a common resonance peak and different free spectral ranges. The global optical transfer function of such a cascade shows only one transmission peak in a frequency range of about 30 nm, and can be thermally tuned in this range.

Paper Details

Date Published: 19 March 1999
PDF: 9 pages
Proc. SPIE 3630, Silicon-based Optoelectronics, (19 March 1999); doi: 10.1117/12.342800
Show Author Affiliations
Giuseppe Cocorullo, IRECE-CNR and Univ. of Calabria (Italy)
Francesco G. Della Corte, IRECE-CNR (Italy)
Mario Iodice, IRECE-CNR (Italy)
Ivo Rendina, IRECE-CNR (Italy)

Published in SPIE Proceedings Vol. 3630:
Silicon-based Optoelectronics
Derek C. Houghton; Eugene A. Fitzgerald, Editor(s)

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