Optical pulse retiming and reshaping circuit
First Claim
Patent Images
1. An optical pulse retiming and reshaping circuit including a phase-locked loop comprising;
- an optical modulator having an optical input, an optical output, and having a modulation control input;
an electrical oscillator having a phase/frequency control signal input, and an output connected to the modulation control input of the modulator;
means optically coupled with the modulator, which means is provided with an electrical output at which is generated by said means an electrical signal which is a measure of the mean optical power transmitted by, or intercepted by, the modulator; and
a phase order indicating device having an input connected to the output of said means, and an output connected to the phase/frequency control signal input of the oscillator.
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Abstract
An optical pulse retiming and reshaping circuit for soliton transmission in a transmission system with distributed amplifiers transmits the pulses through an optical modulator, uses a slow photodiode to determine the mean power transmitted (or intercepted) by the modulator. This is used for generating a control signal for use in a phase-locked loop to regulate the phase of an oscillator driving the modulator.
28 Citations
20 Claims
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1. An optical pulse retiming and reshaping circuit including a phase-locked loop comprising;
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an optical modulator having an optical input, an optical output, and having a modulation control input; an electrical oscillator having a phase/frequency control signal input, and an output connected to the modulation control input of the modulator; means optically coupled with the modulator, which means is provided with an electrical output at which is generated by said means an electrical signal which is a measure of the mean optical power transmitted by, or intercepted by, the modulator; and a phase order indicating device having an input connected to the output of said means, and an output connected to the phase/frequency control signal input of the oscillator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An optical pulse retiming and reshaping circuit including a phase-locked loop comprising;
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a combined optical modulator and electrical resonant circuit containing oscillator, combined such that the modulator exhibits a self-capacitance that forms a part of the resonant circuit of the electrical oscillator, the optical modulator having an optical input, an optical output, and having a modulation control input;
the electrical oscillator having a phase/frequency control signal input, and an output connected to the modulation control input of the modulator;means optically coupled with the modulator, which means is provided with an electrical output at which is generated by said means an electrical signal which is a measure of the mean optical power transmitted by, or intercepted by, the modulator; and a phase order indicating device having an input connected to the output of said means, and an output connected to the phase/frequency control signal input of the oscillator. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification