H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1, 315/27
H04B 10/155 (2006.01) H01S 3/23 (2006.01) H01S 5/40 (2006.01) H01S 5/0683 (2006.01) H01S 5/0687 (2006.01)
Patent
CA 1251831
16 FREQUENCY REFERENCING SYSTEM AND METHOD ABSTRACT A system and method of referencing frequencies of radiation from a plurality of sources, for example lasers (1,2) includes a filter element (11), such as a Fabry-Perot etalon, onto which the radiation is incident. The filter element has a replicated set of passbands spaced apart in frequency. Detection means (12,13) detects radiation passing through the filter element (11) and provides corresponding output signals. Control means (16-18, 3, 4) is responsive to the output signals from the detection means (12,13) to control the sources (1,2) so that the radiation transmitted through the filter element (11) is maintained substantially constant. The bandwidths of the radiation are small compared with the corresponding passbands of the filter element. The invention is particularly applicable in a communications network in which a number of sets of remote sources of radiation are referenced to a central set of reference sources.
518227
British Telecommunications Public Limited Company
G. Ronald Bell & Associates
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