Optical amplifier with active-fiber loop mirror

Details Optical amplifier with active-fiber loop mirror Optical amplifier with active-fiber loop mirror

H - Electricity

04

B

H04B 10/17 (2006.01) H01S 3/067 (2006.01) H04B 10/24 (2006.01) H01S 3/083 (2006.01) H01S 3/094 (2006.01) H01S 3/23 (2006.01)

Patent

CA 2302101

In optical amplifiers of the kind in which a so-called loop mirror is formed by connecting the ends of a loop of active optical fiber to a 3 dB coupler, improved signal-to-noise ratios are obtained by coupling pump energy into the loop without passing through the 3 dB coupler. The input signal and amplified output signal may be conveyed to and from the coupler by way of isolators connected to input and output ports of the amplifier. Alternatively, they may be conveyed by way of a circulator. Automatic gain control may be provided by means of a fiber grating, or other such wavelength-selective device, which reflects part of the amplified signal having a selected wavelength back into the loop, to provide lasing. The amount of energy so reflected may be controlled by an attenuator.

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