Optical Source, Communications Network Optical Apparatus and Method of Providing an Optical Signal
First Claim
1. An optical source comprising:
- a first laser arranged to generate a first optical signal having a first state of polarization and a first optical frequency;
a second laser arranged to generate a second optical signal having a second state of polarization, substantially orthogonal to the first state of polarization, and having a second optical frequency, different to the first optical frequency by a preselected frequency difference, Δ
v;
a polarization beam coupler arranged to combine the first optical signal and the second optical signal into a composite optical signal comprising both the first optical signal and the second optical signal having said substantially orthogonal states of polarization; and
an output arranged to output the composite optical signal.
1 Assignment
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Accused Products
Abstract
An optical source comprises a first laser arranged to generate a first optical signal having a first state of polarization (SOP) and a first optical frequency; a second laser arranged to generate a second optical signal having a second SOP, substantially orthogonal to the first SOP, and having a second optical frequency, different from the first optical frequency by a preselected frequency difference; a polarisation beam coupler arranged to combine the first optical signal and the second optical signal into a composite optical signal comprising both the first optical signal and the second optical signal having said substantially orthogonal SOPs; and an output arranged to output the composite optical signal.
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Citations
16 Claims
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1. An optical source comprising:
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a first laser arranged to generate a first optical signal having a first state of polarization and a first optical frequency; a second laser arranged to generate a second optical signal having a second state of polarization, substantially orthogonal to the first state of polarization, and having a second optical frequency, different to the first optical frequency by a preselected frequency difference, Δ
v;a polarization beam coupler arranged to combine the first optical signal and the second optical signal into a composite optical signal comprising both the first optical signal and the second optical signal having said substantially orthogonal states of polarization; and an output arranged to output the composite optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of providing an optical signal to a delivery location, the method comprising:
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providing a first optical signal having a first state of polarization and a first optical frequency; providing a second optical signal having a second state of polarization, substantially orthogonal to the first state of polarization, and having a second optical frequency, different to the first optical frequency by a preselected frequency difference, Δ
v;combining the first optical signal and the second optical signal while maintaining the states of polarization of the first and second optical signals, to thereby form a composite optical signal comprising both the first optical signal and the second optical signal having said substantially orthogonal states of polarization; transmitting the composite optical signal to the delivery location; and filtering the composite optical signal to select a portion of the composite optical signal having a preselected state of polarization. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification