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Proceedings Paper

Athermal design and analysis for WDM applications
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Paper Abstract

Telecommunication wavelength division multiplexing systems (WDM) demand high fiber-to-fiber coupling to minimize signal loss and maximize performance. WDM systems, with increasing data rates and narrow channel spacing, must maintain performance over the designated wavelength band and across a wide temperature range. Traditional athermal optical design techniques are coupled with detailed thermo-elastic analyses to develop an athermal optical system under thermal soak conditions for a WDM demultiplexer. The demultiplexer uses a pair of doublets and a reflective Littrow-mounted grating employed in a double-pass configuration to separate nine channels of data from one input fiber into nine output fibers operating over the C-band (1530 to 1561.6 nm). The optical system is achromatized and athermalized over a 0 degrees C to 70 degrees C temperature range. Detailed thermo-elastic analyses are performed via a MSC/NASTRAN finite element model. Finite element derived rigid-body positional errors and optical surface deformations are included in the athermalization process. The effects of thermal gradients on system performance are also evaluated. A sensitivity analysis based on fiber coupling efficiency is performed for radial, axial, and lateral temperature gradients.

Paper Details

Date Published: 5 November 2001
PDF: 11 pages
Proc. SPIE 4444, Optomechanical Design and Engineering 2001, (5 November 2001); doi: 10.1117/12.447295
Show Author Affiliations
Keith B. Doyle, Optical Research Associates (United States)
Jeffrey M. Hoffman, Optical Research Associates (United States)

Published in SPIE Proceedings Vol. 4444:
Optomechanical Design and Engineering 2001
Alson E. Hatheway, Editor(s)

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