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Title: Cross-talk free, low-noise optical amplifier

A low-noise optical amplifier solves crosstalk problems in optical amplifiers by using an optical cavity oriented off-axis (e.g. perpendicular) to the direction of a signal amplified by the gain medium of the optical amplifier. Several devices are used to suppress parasitic lasing of these types of structures. The parasitic lasing causes the gain of these structures to be practically unusable. The lasing cavity is operated above threshold and the gain of the laser is clamped to overcome the losses of the cavity. Any increase in pumping causes the lasing power to increase. The clamping action of the gain greatly reduces crosstalk due to gain saturation for the amplified signal beam. It also reduces other nonlinearities associated with the gain medium such as four-wave mixing induced crosstalk. This clamping action can occur for a bandwidth defined by the speed of the laser cavity. The lasing field also reduces the response time of the gain medium. By having the lasing field off-axis, no special coatings are needed. Other advantages are that the lasing field is easily separated from the amplified signal and the carrier grating fluctuations induced by four-wave mixing are decreased. Two related methods reduce the amplified spontaneous emission power withoutmore » sacrificing the gain of the optical amplifier.« less
Inventors:
 [1];  [2];  [3]
  1. (Moraga, CA)
  2. (Livermore, CA)
  3. (Pleasanton, CA)
Issue Date:
OSTI Identifier:
870004
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5436759
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
cross-talk; free; low-noise; optical; amplifier; solves; crosstalk; amplifiers; cavity; oriented; off-axis; perpendicular; direction; signal; amplified; medium; devices; suppress; parasitic; lasing; types; structures; causes; practically; unusable; operated; threshold; laser; clamped; overcome; losses; increase; pumping; power; clamping; action; greatly; reduces; due; saturation; beam; nonlinearities; associated; four-wave; mixing; induced; occur; bandwidth; defined; speed; field; response; time; special; coatings; advantages; easily; separated; carrier; grating; fluctuations; decreased; related; methods; reduce; spontaneous; emission; sacrificing; related method; optical amplifier; four-wave mixing; greatly reduces; related methods; laser cavity; optical cavity; response time; signal beam; easily separated; spontaneous emission; signal amplified; optical amplifiers; greatly reduce; wave mixing; noise optical; low-noise optical; /359/