LOW CARRIER PHASE NOISE FIBER OSCILLATORS
First Claim
1. ) A fiber frequency comb system having a free-running carrier envelope offset frequency with a 3 dB linewidth Δ
- fceo less than 1 MHz, said fiber frequency comb system further comprising;
an intra-cavity amplitude modulator, said intra-cavity amplitude modulator configured for repetition rate control of said fiber frequency comb system, wherein said intra-cavity amplitude modulator is configured to allow for a frequency modulation range Δ
fopt of a comb line in an optical frequency domain, said frequency modulation range being achievable at least at one modulation frequency greater than 20 kHz, wherein Δ
fopt is greater than Δ
fceo/100.
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Accused Products
Abstract
The present disclosure relates to the design of fiber frequency comb lasers with low carrier phase noise. Examples of these low carrier phase noise oscillators can be constructed from both soliton and dispersion compensated fiber lasers via the use of intra-cavity amplitude modulators such as graphene modulators. In low carrier phase noise dispersion compensated fiber frequency comb lasers, graphene and/or bulk modulators can further be used, for example, for phase locking of one comb line to an external continuous wave (cw) reference laser via high bandwidth control of the repetition rate of the comb laser via the graphene modulator. As a result a low phase noise radio frequency (RF) signal can be generated. In some implementations, a frequency comb exhibiting phase noise suppression of at least about 10 dB over a frequency range up to about 100 kHz is provided.
15 Citations
20 Claims
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1. ) A fiber frequency comb system having a free-running carrier envelope offset frequency with a 3 dB linewidth Δ
- fceo less than 1 MHz, said fiber frequency comb system further comprising;
an intra-cavity amplitude modulator, said intra-cavity amplitude modulator configured for repetition rate control of said fiber frequency comb system, wherein said intra-cavity amplitude modulator is configured to allow for a frequency modulation range Δ
fopt of a comb line in an optical frequency domain, said frequency modulation range being achievable at least at one modulation frequency greater than 20 kHz, wherein Δ
fopt is greater than Δ
fceo/100. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- fceo less than 1 MHz, said fiber frequency comb system further comprising;
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12. ) A mid-infrared (IR) fiber source based on difference frequency generation (DFG) or optical parametric amplification (OPA), the fiber source comprising:
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a mode locked fiber oscillator; a fiber amplifier; a fiber supercontinuum stage; a pump diode configured to pump said fiber oscillator and said fiber amplifier, said pump diode configured to be driven by a current source configured to provide a pump diode current to said fiber oscillator and to said fiber amplifier; said fiber supercontinuum stage configured to produce tunable mid-IR output via DFG or OPA between output from the fiber supercontinuum stage and at least a fraction of output from the fiber amplifier; and an amplitude noise reduction arrangement via a feedback loop to reduce amplitude noise of the tunable mid-IR output, wherein said amplitude noise reduction arrangement is based on control of said pump diode current to said fiber oscillator or said pump diode current to said fiber amplifier. - View Dependent Claims (13)
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14. ) A frequency comb system comprising:
a fiber oscillator having an intra-cavity graphene modulator and an intra-cavity bulk modulator, said frequency comb system configured for control of at least a carrier envelope offset frequency, fceo. - View Dependent Claims (15, 16, 17, 18)
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19. ) A cavity enhanced optical spectroscopy system comprising:
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a comb source comprising a mode locked oscillator; a high bandwidth intra-cavity modulator for intra-cavity amplitude modulation of said comb source at a modulation frequency; an optical cavity, wherein transmission from said optical cavity comprises a spectrum which overlaps with an emission spectrum of said comb source in at least a first narrow spectral range; a detector configured to detect light reflected from the cavity in said first narrow spectral range; a phase detector or mixer configured to create an error signal from the modulation frequency; and an electronic feedback loop responsive to said error signal and configured to lock cavity mode resonances to comb frequencies of said comb source.
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20. ) A cavity enhanced optical spectroscopy system comprising:
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a comb source comprising a mode locked oscillator; a graphene modulator configured for repetition rate control of said comb source via an electronic feedback loop; and an optical cavity, wherein transmission from said optical cavity comprises a spectrum which overlaps with an emission spectrum of said comb source in at least a first narrow spectral range.
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Specification