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US 6,856,455 B2Granted
Light source apparatus, optical amplifier and optical communication system
AssigneeFujitsu Limited
InventorsNorihisa Naganuma, Norifumi Shukunami
Life of this patent
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Abstract
An apparatus has first and second light sources, a plurality of filters, and an optical switch. The light sources output a light beam having a spectrum determined by a gain band thereof. The plurality of filters each have a reflection band included in the gain band. The optical switch selectively couples the filters to the light source. The first and second light sources provide pumping light to a single transmission line. The first and second filters are configured so as to not reflect signal light to be amplified.
Claims13
An apparatus comprising:
- a first light source outputting a light beam having a spectrum determined by a gain band;
- a second light source outputting a light beam having a spectrum determined by a gain band;
- a plurality of filters each having a reflection band included in said gain band;
- and
- an optical switch having first and second input ports for inputting light beams outputted from said first and second light sources, and a plurality of output ports optically connected to said plurality of filters for selectively coupling said plurality of output ports to one of said first and second input ports;
- and
- a control unit to control the selective coupling of said plurality of output ports to one of said first and second input ports according to status of said first and second light sources,
- wherein said first and second light sources provide pumping light to a single transmission line.
5 more elements
An apparatus comprising:
- a first light source outputting a light beam having a wavelength band;
- a second light source outputting a light beam having a wavelength band;
- a plurality of filters each having a reflection band included in the wavelength band;
- an optical switch having inputs connected respectively to the first and second light sources and outputs connected respectively to the plurality of filters, for selectively coupling at least one of the inputs to at least one of the outputs;
- and
- a coupler to couple the plurality of filters with a single transmission line such that at least one of the first and second light sources provide pumping light to the transmission line.
3 more elements
Dependencies are inferred from the claim text.