Thermal compensated fused-fiber dense wavelength division multip

Details Thermal compensated fused-fiber dense wavelength division multip Thermal compensated fused-fiber dense wavelength division multip

1997-11-03

2000-06-27

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling structure

359494, G02B 626

Patent

active

060816414

ABSTRACT:
A structure and method are provided to compensate for temperature changes on wavelength shifting in DWDM by reducing tension in a fused-fiber DWDM when temperature increases and increasing tension when temperature decreases, thereby stabilizing wavelength shifts throughout the range of operating temperatures. The DWDM, which is enclosed by a protective package in some embodiments, is connected to substrates of different thermal expansion coefficients, such that the fused-fiber portion of the DWDM exhibits negative thermal expansion, i.e. contracts when temperature increases and expands when temperature decreases. As a result, temperature-induced wavelength shifts are minimized due to a passive thermal compensation, which can be easily adjusted. In other embodiments, twisting the fused-fiber portion of the DWDM to obtain optimum phase matching minimizes the polarization-dependent losses in the incoming light.

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patent: 5673129 (1997-09-01), Mizrahi
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