| 摘要 |
PCT No. PCT/GB91/02197 Sec. 371 Date Aug. 25, 1993 Sec. 102(e) Date Aug. 25, 1993 PCT Filed Dec. 11, 1991 PCT Pub. No. WO92/10887 PCT Pub. Date Jun. 25, 1992An optical telecommunications system suitable for operation as a wavelength division multiplex, which system contains at least one filter for attenuating signals at wavelength which are unwanted at a location of the filter, characterized in that the filter comprises an optical fiber which contains a dopant adapted to absorb the unwanted signals. |
