Fiber optic transmitter
First Claim
1. A fiber optic transmitter comprising:
- a single longitudinal mode, single polarization fiber laser constructed and arranged to simultaneously have a signal output and a pump output;
a polarization maintaining wavelength division multiplexer (PM WDM) connected to said fiber laser for separating the pump output from the signal output, said PM WDM outputting the signal output on a first output trunk and the pump output on a second output trunk;
a polarization maintaining optical isolator (PM isolator) connected to the first output trunk of the PM WDM;
a modulator connected to the PM isolator;
a first wavelength division multiplexer (WDM) having a first input connected to an output of the modulator, and a second input connected the second output trunk of the PM WDM, said first WDM recombining the signal output and the pump output after modulation of the signal output; and
a rare-earth doped fiber having an input end connected to an output of the first WDM.
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Accused Products
Abstract
A fiber optic transmitter provides integrated creation and amplification of a fiber optic signal from a single pump source. A fiber laser is utilized to produce a signal output and a remnant pump output from a single pump source. The remnant pump output is divided out of the signal path while the signal output is modulated and then recombined with the modulated signal output and passed through an erbium doped fiber which absorbs the pump output to amplify the modulated signal output. The output from the fiber laser is input into a first wavelength division multiplexer (WDM) which divides the pump output from the signal output. The first WDM outputs the signal output on a first output trunk and the pump output on a second output trunk. A modulator is connected to the first output trunk of the first WDM for modulating the signal output. A second WDM having a first input connected to the output of the modulator and a second input connected to the second output trunk (pump output) of the first WDM recombines the signal output and the pump output after modulation of the signal output. The recombined signal and pump outputs are then passed through a rare-earth doped fiber to amplify the modulated signal output.
32 Citations
26 Claims
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1. A fiber optic transmitter comprising:
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a single longitudinal mode, single polarization fiber laser constructed and arranged to simultaneously have a signal output and a pump output; a polarization maintaining wavelength division multiplexer (PM WDM) connected to said fiber laser for separating the pump output from the signal output, said PM WDM outputting the signal output on a first output trunk and the pump output on a second output trunk; a polarization maintaining optical isolator (PM isolator) connected to the first output trunk of the PM WDM; a modulator connected to the PM isolator; a first wavelength division multiplexer (WDM) having a first input connected to an output of the modulator, and a second input connected the second output trunk of the PM WDM, said first WDM recombining the signal output and the pump output after modulation of the signal output; and a rare-earth doped fiber having an input end connected to an output of the first WDM. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A multiple-wavelength fiber optic transmitter comprising:
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a single longitudinal mode, single polarization pump laser; a parallel splitter connected to said pump laser for providing first and second pump output channels; first and second fiber lasers respectively connected to said first and second output channels, said first fiber laser being constructed and arranged to produce a first signal output, said second fiber laser being constructed and arranged to produce a second signal output; a modulation sub-assembly connected to each of said first and second fiber lasers, each of said modulation sub-assemblies comprising a polarization maintaining wavelength division multiplexer (PM WDM) connected to said respective fiber laser output for separating the pump output from the respective signal output, said PM WDM outputting said respective signal output on a first output trunk and a pump output on a second output trunk, a polarization maintaining isolator connected to the first output trunk of the PM WDM; a modulator connected to the PM isolator, a first wavelength division multiplexer (WDM) having a first input connected to the modulator, and a second input connected the second output trunk of the PM WDM, said first WDM recombining the respective signal output and the pump output after modulation of the respective signal output, and a rare-earth doped fiber connected to an output of said first WDM; and a second WDM having first and second inputs connected to the respective output ends of the rare-earth doped fibers of said modulation sub-assemblies. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A multiple-wavelength fiber optic transmitter comprising:
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a single longitudinal mode, single polarization pump laser; first and second fiber lasers respectively connected in series to an output of said pump laser, said first fiber laser being constructed and arranged to produce a first signal output, said second fiber laser being constructed and arranged to produce a second signal output; a first polarization maintaining wavelength division multiplexer (PM WDM) connected to an output of said second fiber laser for separating the pump output from the respective signal outputs, said first PM WDM outputting said respective signal outputs on a first output trunk and a pump output on a second output trunk; a polarization maintaining isolator connected to the first output trunk of the first PM WDM; a second PM WDM having an input connected to the PM isolator, said second PM WDM outputting said first signal output on a first output trunk and said second output signal on a second output trunk; first and second modulators connected respectively to the first and second output trunks of said second PM WDM; a first WDM having a first input connected to the first modulator, and a second input connected the second modulator, said first WDM recombining said first and second signal outputs; a second WDM having a first input connected to the output of said first WDM, and a second input connected to the second output trunk of said first PM WDM, said second WDM recombining the first and second modulated signal outputs with the pump output; and a rare-earth doped fiber connected to an output of said second WDM. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A multiple-wavelength fiber optic transmitter comprising:
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a single longitudinal mode, single polarization pump laser; first and second fiber lasers respectively connected in series to an output of said pump laser, said first fiber laser being constructed and arranged to produce a first signal output, said second fiber laser being constructed and arranged to produce a second signal output; a polarization maintaining wavelength division multiplexer (PM WDM) connected to an output of said second fiber laser for separating the pump output from the respective signal outputs, said PM WDM outputting said respective signal outputs on a first output trunk and a pump output on a second output trunk; a polarization maintaining isolator connected to the first output trunk of the PM WDM; first and second modulators respectively connected in series to the PM isolator; a first wavelength division multiplexer (WDM) having a first input connected to an output of the second modulator, and a second input connected the second output trunk of said PM WDM; and a rare-earth doped fiber connected to an output of said first WDM. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification