Bandwidth enhanced self-injection locked DFB laser with narrow linewidth
AssigneeHRL Laboratories, LLC
InventorsTsung-Yuan Hsu, Willie Ng, Daniel Yap
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Abstract
A laser system and method for self-injection locking. The system includes a laser having a laser output at a frequency ωo. An optical port provides a portion of the laser output at the port and a modulator, coupled to the port, is driven by a RF signal at a frequency ωm generates two sidebands at ωo±ωm. A filter passes one of the two sidebands; and an optical path couples an output of the filter to the laser for injection locking.
Claims28
A laser system with self-injection locking, the laser system comprising:
- (a) a single frequency laser having a laser output for delivering laser light at a frequency ωo;
- (b) a modulator coupled to the output of the laser for generating two sidebands, the modulator being driven by a RF signal at a frequency ωm;
- (c) a filter coupled to an output of the modulator for suppressing or passing one of the two sidebands;
- and
- (d) an optical path coupling an output of the filter to the laser for injection locking.
A method of enhancing the modulation bandwidth of a distributed feedback laser, the distributed feedback laser having a operating frequency and having an output and an input, the method comprising the steps of:
- (a) tapping the output from the distributed feedback laser to thereby define a tapped optical signal;
- (b) shifting the frequency of the tapped optical signal to thereby define a shifted optical signal;
- (c) feeding the shifted optical signal back into the input of the distributed feedback laser.
A laser system with self-injection locking, the laser system including:
- (a) a laser having a laser output at a frequency ωo;
- (b) an optical port providing a portion of said laser output at said port;
- (c) a modulator coupled to the port, the modulator generating two sidebands, the modulator being driven by a RF signal at a frequency ωm;
- (d) a filter coupled to an output of the modulator for suppressing one of the two sidebands and leaving the other sideband essentially unattenuated;
- and
- (e) an optical path coupling an output of the filter to the laser for injection locking.
A laser system with self-injection locking, the system including a laser having a laser output at a frequency ωo;
- an optical port providing a portion of the laser output at the port;
- a modulator, coupled to the port, driven by a RF signal at a frequency ωm to generate two sidebands at ωo±ωm;
- a filter coupled to the modulator for passing or suppressing one of the two sidebands of the signal ωo±ωm;
- and an optical path for coupling an output of the filter to the laser for injection locking the laser.
Dependencies are inferred from the claim text.