| 简介 |
The adjustment of tilt in an optical signal path of a repeater (115, 125, 610). The repeater includes an optical pump (222, 622)that optically powers a rare-Earth doped fiber amplifier (211, 611), which amplifies the optical signa1 (210). The optical signal path also includes Raman gain stage (212, 612) implemented in a previous optical fiber span in the optical signal path, and which contributes tilt with respect to wavelength. Adjusting the Raman gain (212, 612) and/or the rare-Earth doped gain (211, 611) also adjusts the combined tilt contributed by these gain stages. However, the rare-Earth doped gain (211, 611) operates at least partially in the saturated regime, thereby stabilizing the gain at the output of the rare-Earth doped amplifier (211, 611). Thus tilt control may be employed by adjusting optical pump power (231, 232, 631, 632) with reduced effect on overall gain. |
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