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US 5,513,030 AGranted
Optical pulse retiming and reshaping circuit
AssigneeNorthern Telecom Limited
InventorRichard E. Epworth
Life of this patent
Estimating the term…
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.
Claims20
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.
2 more elements
An optical pulse retiming and reshaping circuit including a phase-locked loop comprising;
- 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.
2 more elements
Dependencies are inferred from the claim text.