Multiwavelength mode-locked dense wavelength division multiplexed optical communication systems
First Claim
1. A wavelength ordered repetitive periodic dense wavelength division multiplexed (WORP-DWDM) optical source, comprising:
- a multiwavelength mode-locked (MWML) laser source including a semiconductor optical amplifier (SOA) disposed in a cavity of said MWML laser source, said SOA being actively driven by a radio frequency (RF) signal and emitting periodic pulses within a plurality of discrete wavelength bands simultaneously at a port of said MWML laser source, where the RF signal oscillates at a frequency whereby one of said frequency and a sub-harmonic of said frequency substantially equals the inverse of the round trip travel time of pulses circulating within a cavity of said MWML laser source; and
a temporal dispersion element which time shifts said plurality of wavelengths by differential wavelength-dependent delays so as to transform pulses emitted by said MWML laser source into a wavelength ordered repetitive periodic (WORP) sequence of optical pulses.
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Accused Products
Abstract
A multi-wavelength mode-locked dense wavelength division multiplexed (MWML-DWDM) optical transmission method and system including a MWML-DWDM optical transmitter having a multiwavelength mode-locked (MWML) laser which generates a wavelength-ordered repetitive periodic (WORP) sequence of discrete optical pulses for modulation with data carried by at least one electronic carrier. Signals from multiple telecommunications transmission interfaces are multiplexed together by a high speed electronic time domain multiplexer to form a single multiplexed high speed digital transmission stream that is encoded onto the optical pulse stream output by the MWML-DWDM optical transmitter by an optical modulator so as to provide multiple channels of information carried on a DWDM data stream over an optical fiber to a receiver where the data is received and decoded. A single MWML-DWDM optical transmitter and a single modulator may replace the numerous laser sources and associated modulators used in conventional WDM optical transmission systems. Wavelength usage may be further maximized by combining the outputs of several MWML-DWDM optical transmitters in the frequency domain using optical combiners or in the time domain using time division multiplexing techniques according to which DWDM wavelengths may be used more than once during a WORP-frame but only once during a pulse-frame. A single MWML laser source can provide hundreds of optical carriers.
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Citations
29 Claims
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1. A wavelength ordered repetitive periodic dense wavelength division multiplexed (WORP-DWDM) optical source, comprising:
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a multiwavelength mode-locked (MWML) laser source including a semiconductor optical amplifier (SOA) disposed in a cavity of said MWML laser source, said SOA being actively driven by a radio frequency (RF) signal and emitting periodic pulses within a plurality of discrete wavelength bands simultaneously at a port of said MWML laser source, where the RF signal oscillates at a frequency whereby one of said frequency and a sub-harmonic of said frequency substantially equals the inverse of the round trip travel time of pulses circulating within a cavity of said MWML laser source; and a temporal dispersion element which time shifts said plurality of wavelengths by differential wavelength-dependent delays so as to transform pulses emitted by said MWML laser source into a wavelength ordered repetitive periodic (WORP) sequence of optical pulses. - View Dependent Claims (2, 3)
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4. A multi-wavelength mode-locked dense wavelength division multiplexed (MWML-DWDM) optical transmitter, comprising:
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a multiwavelength mode-locked (MWML) laser source comprising a semiconductor optical amplifier (SOA) disposed in a cavity of said MWML laser source, said SOA being actively driven by a radio frequency (RF) signal and emitting periodic pulses within a plurality of discrete wavelength bands simultaneously at a port of said MWML laser source, where the RF signal oscillates at a frequency whereby one of said frequency and a sub-harmonic of said frequency substantially equals the inverse of the round trip travel time of pulses circulating within a cavity of said MWML laser source; a temporal dispersion element which time shifts said plurality of wavelengths by differential wavelength-dependent delays so as to transform pulses emitted by said MWML laser source into a wavelength ordered repetitive periodic (WORP) sequence of optical pulses; and an optical modulator which modulates an electronic digital data stream onto individual wavelengths in said WORP sequence. - View Dependent Claims (5, 6, 7, 8)
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9. A multi-wavelength mode-locked dense wavelength division multiplexed (MWML-DWDM) optical transmitter, comprising:
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a multiwavelength mode-locked (MWML) laser source comprising a semiconductor optical amplifier (SOA) disposed in a cavity of said MWML laser source, said SOA being actively driven by a radio frequency (RF) signal and emitting periodic pulses within a plurality of discrete wavelength bands simultaneously at a port of said MWML laser source, where the RF signal oscillates at a frequency whereby one of said frequency and a sub-harmonic of said fundamental frequency substantially equals the inverse of the round trip travel time of pulses circulating within a cavity of said MWML laser source; a temporal dispersion element which time shifts said plurality of wavelengths by differential wavelength-dependent delays so as to transform pulses emitted by said MWML laser source into a wavelength ordered repetitive periodic (WORP) sequence of optical pulses; a wavelength selective splitter which splits said WORP sequence of optical pulses into at least two pulse sub-sequences, each pulse sub-sequence containing a subset of wavelengths generated by said MWML laser source; an optical modulator for each pulse sub-sequence, each optical modulator modulating a digital data stream onto each individual wavelength in a pulse sub-sequence received by the optical modulator; and an optical combiner that combines an output from each of said optical modulators into a single multiwavelength aggregated optical data stream for transmission. - View Dependent Claims (10, 11, 12, 13)
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14. A multi-wavelength mode-locked dense wavelength division multiplexed (MWML-DWDM) optical transmitter, comprising:
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a plurality of multiwavelength lasers, each multiwavelength laser emitting pulses at a plurality of wavelengths simultaneously at a port of said multiwavelength laser; a temporal dispersion element which time shifts said plurality of wavelengths by differential wavelength-dependent delays so as to transform pulses emitted by said multiwavelength lasers into a wavelength ordered repetitive periodic dense wavelength division multiplexed (WORP) sequences of optical pulses; an optical modulator for each of said multiwavelength lasers, each optical modulator modulating a digital data stream onto each individual wavelength in said WORP sequence; and an optical combiner which combines WORP sequences from each optical modulator into a single optical data stream for transmission. - View Dependent Claims (15, 16)
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17. A multi-wavelength mode-locked dense wavelength division multiplexed (MWML-DWDM) optical transmission system, comprising:
a MWML-DWDM optical transmitter comprising; a multiwavelength mode-locked (MWML) laser source including a semiconductor optical amplifier (SOA) disposed in a cavity of said MWML laser source, said SOA being actively driven by a radio frequency (RF) signal and emitting periodic pulses within a plurality of discrete wavelength bands simultaneously at a port of said MWML laser source, where the RF signal oscillates at a frequency whereby one of said frequency and a sub-harmonic of said frequency substantially equals the inverse of the round trip travel time of pulses circulating within a cavity of said MWML laser source, a temporal dispersion element which time shifts said plurality of wavelengths by differential wavelength-dependent delays so as to transform pulses emitted by said MWML laser source into a wavelength ordered repetitive periodic (WORP) sequence of optical pulses, and an optical modulator which modulates a digital data stream onto individual wavelengths in said WORP sequence; an optical fiber which transmits said WORP sequence; and a MWML-DWDM optical receiver comprising; a DWDM filter which separates said WORP sequence into said plurality of wavelengths, and a plurality of optical receivers which demodulate said digital data stream from each of said plurality of wavelengths. - View Dependent Claims (18, 19)
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20. A multi-wavelength mode-locked dense wavelength division multiplexed time-division multiplexed (MWML-DWDM-TDM) optical transmission system, comprising:
a MWML-DWDM optical transmitter comprising; at least one multiwavelength laser emitting periodic pulses within a plurality of discrete wavelength bands simultaneously at a port of said multiwavelength laser, a temporal dispersion element for each of said multiwavelength lasers, each temporal dispersion element time shifting said plurality of wavelengths by differential wavelength-dependent delays so as to transform pulses output by said multiwavelength laser into a wavelength ordered repetitive periodic (WORP) sequence of optical pulses, an optical modulator for each of said multiwavelength lasers, each optical modulator modulating a digital data stream onto each individual wavelength in said WORP sequence, and an optical combiner combines said WORP sequences from each optical modulator in a time shifted temporal order such that a wavelength may be used by more than one optical modulator to transmit data so long as said wavelength is not used in the same pulse-frame, where the pulse frame is the time interval allocated within a WORP pulse sequence to transmission of a single pulse, by said more than one optical modulator; an optical fiber which transmits said combined WORP sequences; and a MWML-DWDM-TDM optical receiver comprising; a plurality of optical pulse-frame selectors which select optical data from at least one of a plurality of wavelengths in a particular optical pulse-frame in a received combined WORP sequence, a plurality of DWDM filters, each DWDM filter separating the combined WORP sequences in at least one optical pulse-frame into said plurality of wavelengths, and a plurality of optical receivers which demodulate said optical digital data streams to obtain electronic digital data streams. - View Dependent Claims (21, 22)
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23. A multi-wavelength mode-locked dense wavelength division multiplexed (MWML-DWDM) optical transmission method, comprising the steps of:
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generating light emission by a multiwavelength laser, said light emission including periodic pulses emitted within a plurality of discrete wavelength bands simultaneously at an output of said multiwavelength laser; time shifting pulses in said discrete wavelength bands by differential wavelength-dependent delays so as to transform pulses emitted by said multiwavelength laser into a wavelength ordered repetitive periodic (WORP) sequence; and modulating a digital data stream onto each individual wavelength in said WORP sequence for transmission. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification