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Proceedings Paper

Silica waveguide (SiWG)-based dynamic gain equalizing filter (DGEF)
Author(s): Chellappan Narayanan; Gail A. Bogert; Robert M. Pafchek; Said Belhaj
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Paper Abstract

Equalization of power divergence over the wavelength spectrum is very important in optical WDM networks for optimizing the link performance and maximizing the transmission distance of the link, thereby reducing the cost/bit/km of transmission. In addition to extending the reach of long-haul networks, the ability to from a remote terminal to dynamically equalize the power level changes due to long-term aging of fibers and components, reduces system maintenance costs of today's point-to-point links. As the network evolves to include optical cross-connects and re-configurable optical add-drop nodes for agile and dynamic provisioning, the dynamic gain equalization function allows the ability to compensate the gain variation of the optical amplifiers resulting from varying input power levels. In this presentation we will talk about the DGEF based on silica-on-silicon technology. The device is based on cascading an arrayed waveguide grating (AWG) based de-multiplexer which separates the wavelengths into different bands, an array of Mach-Zhender interferometer (MZI) based attenuators, and an AWG-based multiplexer which recombines all the wavelength bands in to one fiber, all of which are monolithically integrated on one die. The dynamic tuning of the attenuation is achieved by varying the phase of one of the arms of the MZI using the thermo-optic effect. We will present the theory of the DGEF, talk about the control algorithm that is used to obtain the control parameters, and discuss the limitations of the device.

Paper Details

Date Published: 11 July 2002
PDF: 5 pages
Proc. SPIE 4870, Active and Passive Optical Components for WDM Communications II, (11 July 2002); doi: 10.1117/12.475517
Show Author Affiliations
Chellappan Narayanan, Agere Systems (United States)
Gail A. Bogert, Agere Systems (United States)
Robert M. Pafchek, Agere Systems (United States)
Said Belhaj, Agere Systems (United States)


Published in SPIE Proceedings Vol. 4870:
Active and Passive Optical Components for WDM Communications II
Achyut Kumar Dutta; Abdul Ahad Sami Awwal; Niloy K. Dutta; Katsunari Okamoto, Editor(s)

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