High stability fiber light source
First Claim
1. A high stability fiber light source comprising:
- a pump laser;
a fiber grating coupled to said pump laser;
a WDM coupler coupled to said fiber grating;
a rare-earth-doped fiber coupled to said WDM coupler, wherein said rare-earth-doped fiber has an absorption band, and wherein said fiber grating is matched to said absorption band such that light from said fiber grating generates light;
a filter coupled to said WDM coupler, said filter being configured to shape light generated by said rare-earth-doped fiber to a desired waveform; and
an optical isolator coupled to said filter.
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Accused Products
Abstract
A fiber light source having, for instance, a 980 nm pump laser for pumping an erbium-doped optical fiber via a 980/1550 nm WDM coupler. The pumped fiber emits 1550 nm light. A portion of the 1550 nm light goes to a filter via the WDM coupler. The filter shapes the spectrum of the 1550 nm light. The filter is a passive device that may be made from erbium-doped fiber. From the filter the 1550 nm light goes through an isolator or a circulator on to an optical device for which the light is specially made. Such device may be an fiber optic gyroscope. By adding a narrowband optical fiber grating at the output of the pump laser to tune its output, the fiber light source is further improved in stability under variations of ambient temperature and light source drive current.
32 Citations
31 Claims
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1. A high stability fiber light source comprising:
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a pump laser; a fiber grating coupled to said pump laser; a WDM coupler coupled to said fiber grating; a rare-earth-doped fiber coupled to said WDM coupler, wherein said rare-earth-doped fiber has an absorption band, and wherein said fiber grating is matched to said absorption band such that light from said fiber grating generates light; a filter coupled to said WDM coupler, said filter being configured to shape light generated by said rare-earth-doped fiber to a desired waveform; and an optical isolator coupled to said filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for attaining high stability light output from a fiber light source, comprising:
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obtaining a first wavelength light from a pump laser; conveying the first wavelength light into a first wavelength grating that reflects a first portion of the first wavelength light back to the pump laser to stabilize the wavelength of the light from the pump laser; passing a second portion of the first wavelength light through the grating into a rare-earth-doped fiber to pump the rare earth in the doped fiber, which then emits light of a second wavelength light; conveying the second wavelength light through a filter to shape a spectrum of the second wavelength light; and conveying the second wavelength light from the filter as an output. - View Dependent Claims (17, 18)
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19. A high stability fiber light source comprising:
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means for generating light at a first wavelength; grating means for reflecting a first portion of said light at the first wavelength to said means for generating light, proximate to said means for generating light; coupling means, proximate to said grating means, having first, second and third ports, for passing a second portion of said light at the first wavelength from the first port to the second port, blocking light at a second wavelength from the second port to the first port, and passing light at the first wavelength from the second port to the third port; means, proximate to said coupling means, for absorbing light of the first wavelength and emitting light of the second wavelength; and means, proximate to said coupling means, for filtering light of the second wavelength from the third port of said coupling means. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A light source comprising:
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a pump laser providing pump light to a doped fiber; a grating optically situated between said pump laser and said doped fiber, wherein said grating is matched to an absorption band of said doped fiber such that said pump light corresponds to said absorption band, and wherein said doped fiber generates light in response to said pump light; and an optical filter configured to shape the light generated by said doped fiber to produce a desired output waveform. - View Dependent Claims (27, 28)
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29. A fiber optic gyroscope comprising a light source providing a light that forms counter-rotating light beams in an optical coil such that a phase difference between said counter-rotating light beams is indicative of a rotation rate, wherein said light source comprises:
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a pump laser providing pump light to a doped fiber; a grating optically situated between said pump laser and said doped fiber, wherein said grating is matched to an absorption band of said doped fiber such that said pump light corresponds to said absorption band, and wherein said doped fiber generates light in response to said pump light; and an optical filter configured to shape the light generated by said doped fiber to produce a desired output waveform. - View Dependent Claims (30, 31)
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Specification