| 摘要 |
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 (60), which is enclosed by a protective package in some embodiments, is connected to substrates (62, 63) of different thermal expansion coefficients, such that the fused-fiber portion (65) of the DWDM (60) 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 (53) of the DWDM (50) to obtain optimum phase matching minimizes the polarization-dependent losses in the incoming light.
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