WO2016044822A1 - Multiplexage par répartition en longueur d'onde dense et systèmes de transmission à une seule longueur d'onde - Google Patents

Multiplexage par répartition en longueur d'onde dense et systèmes de transmission à une seule longueur d'onde Download PDF

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Publication number
WO2016044822A1
WO2016044822A1 PCT/US2015/051124 US2015051124W WO2016044822A1 WO 2016044822 A1 WO2016044822 A1 WO 2016044822A1 US 2015051124 W US2015051124 W US 2015051124W WO 2016044822 A1 WO2016044822 A1 WO 2016044822A1
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Prior art keywords
optical
signal
serially connected
transmission system
data transmission
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PCT/US2015/051124
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English (en)
Inventor
Winston I. Way
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Neophotonics Corporation
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Publication of WO2016044822A1 publication Critical patent/WO2016044822A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/524—Pulse modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/40—Transceivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation
    • H04B10/541—Digital intensity or amplitude modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant

Definitions

  • the present disclosure relates to high capacity data center interconnection using optical transmission, specifically the use of optical dense wave division multiplexing using pulse-amplitude-modulation with four levels (PAM4 modulation) and single-wavelength using coherent-detection-based modulation to transmit significant amounts of data over large distances for data center interconnection.
  • PAM4 modulation pulse-amplitude-modulation with four levels
  • a data transceiver module comprising: a plurality of optical transmitters, each optical transmitter being configured to receive a modulated signal and generate an optical signal having a wavelength different from wavelengths generated by others of the plurality of optical transmitters; a plurality of optical receivers, each optical receiver being configured to receive an optical signal having a wavelength matching one of the plurality of optical transmitters and convert it to an information bearing electrical signal; and a four level pulse-amplitude-modulator (PAM4) chip generating a pulse modulated information bearing signal input to at least one optical transmitter and receiving the information bearing from at least one optical receiver and converting it to an information signal used pulse amplitude demodulation.
  • PAM4 pulse-amplitude-modulator
  • a data transmission system 100 comprises: a plurality of 30GHz optical transmitters 102 (Ch#1 TX through Ch#40 TX in Fig. 1 ), each optical transmitter including a four level pulse-amplitude- modulation (PAM4) chip 103 configured to generate an optical signal having a wavelength using PAM4 modulation and with 1000Gb/s data rate; a multiplexer 104 serially connected to each of the plurality of optical transmitters configured to multiplex the optical signals generated by each optical transmitter into a single optical dense-wavelength-division-multiplexed (DWDM) signal; a first erbium-doped fiber amplifier (EDFA) 106 serially connected to the multiplexer and configured to amplify the single optical DWDM signal; a single-mode-fiber link 108 serially connected to the first EDFA configured to transmit the amplified single optical DWDM signal; a dispersion compensator 1 10 configured to receive the single optical DWDM signal
  • a data transmission system comprises: a plurality of PAM4 100 Gb/s optical transceiver modules, each
  • a multiplexer serially connected to each of the plurality of optical 100Gb/s transceivers configured to multiplex the two wavelength of the optical transceiver modules into a single optical DWDM signal; a first erbium-doped fiber amplifier (EDFA) serially connected to the multiplexer, amplifying the single optical DWDM signal; a single-mode-fiber link serially
  • a dispersion compensator configured to receive the single optical DWDM signal transmitted by the single-mode-fiber link, and compensate the single optical DWDM signal to compensate for accumulated fiber chromatic dispersion; a second EDFA serially connected to the dispersion compensator, configured to amplify the compensated single optical signal; a demultiplexer serially connected to the second EDFA, configured to demultiplex the amplified, compensated single optical DWDM signal into a plurality of compensated optical wavelengths; and a plurality of 100Gb/s optical transceiver modules each consisting of two optical receivers, receiving the plurality of compensated optical signals, wherein each optical receiver is serially connected to the demultiplexer and configured to receive one of the plurality of compensated 50Gb/s optical wavelengths.
  • the received electrical 50Gb/s signal is then sent to a PAM4 chip within the 100Gb/s optical transceiver for demodulation and decoding.
  • a data transmission system includes: a plurality of >30GHz optical
  • each optical transmitter being configured to generate an optical signal having a wavelength using PAM4 modulation and with >100Gb/s data rate; a multiplexer serially connected to each of the plurality of optical transmitters
  • DWDM dense-wavelength-division-multiplexed
  • EDFA erbium- doped fiber amplifier
  • a compensator configured to receive the optical single signal transmitted by the single- mode-fiber link and compensate for accumulated fiber chromatic dispersion; a second EDFA serially connected to the dispersion compensator configured to amplify the compensated single optical DWDM signal; a demultiplexer serially connected to the second EDFA configured to demultiplex the amplified,
  • each optical receiver being serially connected to the demultiplexer and configured to receive one of the plurality of compensated optical wavelengths.
  • Each optical transmitter and receiver can be contained within a single optical module.
  • a method for transmitting data in a data transmission system includes:
  • DP-nQAM dual-polarization n-ary quadrature-amplitude modulation
  • EDFA erbium-doped fiber amplifier
  • SMF single-mode-fiber
  • the transmitter may use a non-tunable, C-band laser.
  • the receiver may be a single wavelength, C-band, high-sensitivity coherent receiver.
  • a regular coherent receiver may be used when EDFAs are used.
  • An electronic DP-nQAM chip consisting of an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), and digital-signal-processor (DSP) can be co-packaged with the optical coherent transmitter and optical coherent receiver.
  • the electronic DP-nQAM chip can also be sitting outside the package of the optical coherent transmitter and optical coherent receiver.
  • a method for transmitting data in a data transmission system includes:
  • the transmitter may use a non-tunable, C-band laser. If EDFAs are not used, the receiver may be aC-band, high-sensitivity coherent receiver. A regular coherent receiver may be used when EDFAs are used.
  • An electronic DP-nQAM chip including an analog-to-digital converter (ADC), a digital-to- analog converter (DAC), and digital-signal-processor (DSP) can be co-packaged with the optical coherent transmitter and optical coherent receiver.
  • the electronic chip can also be sitting outside the package of the optical coherent transmitter and optical coherent receiver.
  • FIG. 1 is a block diagram illustrating a high capacity DWDM PAM4 data transmission system with >100Gb/s per wavelength in accordance with exemplary embodiments.
  • FIG. 2 is a block diagram illustrating a high capacity DWDM PAM4 data transmission system with >50Gb/s per wavelength in accordance with exemplary embodiments.
  • FIG. 3(a) is a block diagram illustrating a high capacity coherent data transmission system using a single wavelength in the 1550nm, C-band and with erbium-doped-fiber amplifiers in accordance with exemplary embodiments.
  • Fig. 3(b) is a block diagram illustrating a high capacity coherent data transmission system using a single wavelength in the 1550nm, C-band and without erbium-doped-fiber amplifiers in accordance with exemplary embodiments.
  • Fig. 4 is a block diagram illustrating a high capacity PAM4 data transmission system using a single 1310nm wavelength and with a gain-clamped semiconductor optical amplifier in accordance with exemplary embodiments.
  • FIG. 5 is a flow chart illustrating an exemplary method for transmitting data in a data transmission system in accordance with exemplary embodiments.
  • Fig. 6 is a flow chart illustrating an exemplary method for transmitting data in a data transmission system in accordance with exemplary embodiments.
  • FIG. 1 illustrates a data transmission system 100 which, depending on implementation, can achieve high capacity transmission of data in a data
  • the data transmission system 100 may be a dense wavelength division multiplexing (DWDM) system.
  • DWDM dense wavelength division multiplexing
  • a data transmission system 100 includes a plurality of optical transmitters 102.
  • the optical transmitters 02 may be 30 GHz optical transmitters configured to transmit data signals at 100 Gbps. Signals generated by the optical transmitters 102 may be of a specific frequency. In some instances, each optical transmitter 102 may generate a signal having a frequency that is different from the signals generated by each of the other optical transmitters 102. In further instances, the different frequencies may be equally spaced or spaced at different intervals. As shown, there are 40 transmitters 102, but the actual number may vary based on design
  • the optical transmitters 102 may be comprised of multiple components, including, for example, a PAM4 chip 103 (which contains encoder, decoder, timing recovery, serializer, de-serializer, digital signal processor (DSP), a digital-to-analog converter (DAC) and an analog-to-digital converter (ADC)), a linear driver amplifier, a modulator, and a tunable or fixed- wavelength laser.
  • a PAM4 chip 103 which contains encoder, decoder, timing recovery, serializer, de-serializer, digital signal processor (DSP), a digital-to-analog converter (DAC) and an analog-to-digital converter (ADC)
  • DSP digital signal processor
  • DAC digital-to-analog converter
  • ADC analog-to-digital converter
  • the optical signal in each optical transmitter 102 may be modulated by a direct detection-based pulse-amplitude-modulation using a pulse- amplitude-modulator 103 with four amplitude level optical transmitters that is configured to generate an optical signal having a prescribed wavelength using PAM4 modulation and with >100Gb/s data rate in this embodiment.
  • Pulse-amplitude modulation is a form of signal modulation in which message information is encoded in the amplitude of a series of regularly timed signal pulses. That is, the amplitudes of a train of carrier pulses are varied according to the sample value of the message signal.
  • the PAM4 chip 103 and the optical transmitters 102 can be housed in a commercially available quad small form factor pluggable (QSFP) module 01 , such a QSFP28 module and is therefore backwards compatible in the hardware housing (e.g., slots and racks) of preexisting fiber optic systems.
  • QSFP quad small form factor pluggable
  • Other form factors can be used, but being able to be placed in a commonly used one is of significant advantage.
  • the data transmission system 100 further includes a wavelength-division multiplexing (WDM) multiplexer 104, inputs of which are serially connected to respective plurality of different wavelengths output from the plurality of optical transmitters (each with one or two output optical fibers).
  • the multiplexer 104 is configured to multiplex the optical signals generated by each optical transmitter into a single optical DWDM output signal.
  • the output of the multiplexer 104 is serially connected to the input to a first erbium-doped fiber amplifier (EDFA) 106, which is configured to amplify the single optical DWDM signal prior to transmission to the receiving end of the data transmission system 100.
  • EDFA erbium-doped fiber amplifier
  • the optical gain of the first EDFA 106 may be based on the length of the data transmission, the number of the wavelengths, and other such factors that will be apparent to persons having skill in the relevant art.
  • An EDFA is a device that amplifies an optical fiber signal which, in general, works on the principle of stimulating the emission of photons.
  • the first EDFA includes a variable optical attenuator configured to attenuate the amplified single optical signal prior to transmission via the single-mode-fiber link.
  • the multiplexer 104 may have up to 96 channels that can be multiplexed together.
  • ⁇ 48 optical transceiver modules containing ⁇ 96 53 ⁇ 56Gb/s PAM4 optical transmitters or ⁇ 48 optical transceiver modules containing ⁇ 48 106-1 12Gb/s PAM4 optical transmitters 102 may be connected to the multiplexer 104 for example.
  • a standard single-mode-fiber (SMF) link 108 serially connected to the output of the first EDFA 106 and is configured to transmit the amplified single optical DWDM signal to the input of a dispersion compensator 1 10.
  • the SMF link 108 may be many kilometers long, traversing the distance between data centers, for example.
  • the SMF link 108 may be, for example, a 40-100 km link.
  • the SMF link 108 may be serially connected to a dispersion compensator 1 10 to which the single DWDM signal is sent.
  • the dispersion compensator 1 10 may be configured to compensate the signal transmitted via the SMF link for any fiber chromatic dispersion (CD) that accumulates as a result of the transmission of the signal.
  • the dispersion compensator 1 10 may be a tunable dispersion compensator (DCM).
  • a fixed dispersion compensator or dispersion compensation fiber (DCF) may be used as the dispersion compensator 1 10.
  • a combination of a tunable DCM and a DCF may be used to compensate for accumulated fiber CD.
  • a single tunable DCM may be used.
  • the tunable DCM may be preferred as tuning may be beneficial due to variance in length of the SSMF link 108.
  • the DCM may be a fiber-Bragg-grating-based DCM.
  • the transmission system 100 can include a tunable dispersion compensator (not illustrated) in combination with a fixed dispersion compensator (not illustrated) in the transmission system 100.
  • a second EDFA 1 12 is serially connected to the output of the dispersion compensator 1 10 and is configured to amplify the dispersion compensated single optical DWDM signal. That is, once the dispersion compensator 1 10 has compensated the accumulated CD in the transmission link 108, the compensated signal may be sent to a serially connected, second EDFA 112. The second EDFA 1 12 may be configured to amplify the compensated signal, such as to compensate for any loss suffered via transmission over the SMF link 108 and the dispersion compensator 1 10.
  • the amount of amplification provided by the second EDFA 1 12 to the signal may be based on the strength of the signal as sent by the dispersion compensator 110, the length of the SMF link 108, and the latter components in the receiving end of the data transmission system 100 that are to receive the signal after amplification.
  • the second EDFA 1 12 may include a variable optical attenuator configured to attenuate the transmitted single optical signal prior to demultiplexing by the demultiplexer.
  • a demultiplexer 1 14 is serially connected to the output of the second EDFA and is configured to demultiplex the amplified, dispersion compensated single optical DWDM signal into a plurality of compensated optical wavelengths for output at respective separate outputs of the demultiplexer 1 14.
  • the second EDFA 112 may be serially connected to a demultiplexer 1 14.
  • the demultiplexer 1 14 may have the same number of channels as the multiplexer 104 and may be configured to separate the DWDM signal into the same number of wavelengths multiplexed by the multiplexer 104.
  • the demultiplexer 1 14 may demultiplex the amplified, compensated signal into forty dual-channel signals. However, as long as the multiplexer 104 and the demultiplexer 1 14 have the minimum number of channels for a give design, either or both can have more available channels than are used. [0029]
  • the demultiplexer 1 14 may be serially connected to a plurality of optical receivers 1 16, which may be in the form of a receiver optical sub assembly (ROSA) or as part of the data transceiver module 101 .
  • ROSA receiver optical sub assembly
  • Each of the optical receivers 1 16 may be configured to receive one of the wavelengths generated by the demultiplexer 1 14 via the demultiplexing of the amplified, compensated signal.
  • the number of optical receivers 16 may be equal to the number of optical transmitters 102.
  • the optical receivers 1 16 may include a p-type, intrinsic n-type diode (PIN) photodiode (which increases its electrical conductivity as a function of the intensity, wavelength and most topically the modulation rate of the impinging light) and a trans impedance amplifier (TIA).
  • PIN p-type, intrinsic n-type diode
  • TIA trans impedance amplifier
  • it can include an avalanche photodiode (APD) and a TIA.
  • each optical receiver 1 16 may include a linear PIN-TIA receiver.
  • the receivers 1 16 may include the receiving part (e.g., timing recovery, PAM4 decoder, digital signal processor (DSP), forward-error-correction decode (FEC), etc.) of a PAM4 chip 103, acting as a PAM4 demodulator 1 18.
  • Each PAM4 chip is configured to de-serializing the 4x25Gb/s non-return to zero (NRZ) data, and serialize the NRZ data into two streams of 50Gb/s PAM4 data in one direction, and reverse the signal processing sequence in a different direction.
  • Each PAM4 chip includes a digital to analog converter (DAC), an analog to digital converter (ADC), in addition to the digital signal processing (DSP) unit, and the forward error correction (FEC) codec, in exemplary embodiments.
  • DAC digital to analog converter
  • ADC analog to digital converter
  • FEC forward error correction
  • the optical receivers 116 and PAM4 demodulator circuitry 118 of the PAM4 chip 103 may be housed in a QSFP module 1 17, such as QSFP28 module for instance.
  • Each optical receiver 1 16 should have a bandwidth of approximately equal to or greater than 15GHz in the exemplary embodiment to receive a 50Gb/s PAM4 signal.
  • each optical transmitter being configured to generate an optical signal having a wavelength using PAM4
  • the above components may also form an optical transceiver module 101 that is composed of two 50Gb/s optical transmitters 102 with two separate wavelengths, two 50Gb/s optical receivers 1 16, and a single 2x50Gb/s PAM4 chip that is used on the transmitter side that transmits a single optical DWDM signal to the SMF link 108 and acts on the receiver side to receive a different single optical DWDM signal transmitted from a remote data center or the like.
  • the PAM4 chip 103 has both components for transmission and reception, as explained above.
  • This transceiver module 101 may be housed in a single QSFP module, such as QSFP28 module for instance.
  • Fig. 2 [Chad, but some the contents of Fig.2 have already been mentioned previously- the sequence is a bit mixed and not a clear-cut] illustrates an alternative data transmission system 200 that uses similar components as the embodiment of Fig. 1 , which are identified as such by like reference numbers.
  • the data transmission system 200 may include a plurality of multiplexers 104 and demultiplexers 1 14 to accommodate a larger number of overall channels as used in the data transmission system 100 or to use the same number of channels as in the data transmission system 100 but using smaller multiplexers 104 and demultiplexers 1 14.
  • the data transmission system 100 of Fig. 1 uses an 80 channel multiplexer 104.
  • the data transmission system 200 illustrated in Fig. 2 may use two 40 channel multiplexers 104, for example.
  • the data transmission system 200 may include a plurality of PAM4 100 Gb/s optical transceivers 01 , each including an electrical PAM4 chip 103 generating two signals of 50Gb/s data, with each 50Gb/s data signal driving two 10G optical transmitters 102 with a total of two wavelengths and therefore two output optical fibers that are each connected to one of two multiplexers 104 in the illustrated example.
  • the block labeled 'PAM4 (TX)' represents a dual PAM4 encoder.
  • the 100 Gb/s transceivers 101 can be housed in a single QSFP28 module in this exemplary embodiment.
  • Each of the two multiplexers 104 may be serially connected to half of the optical transmitters 102 and be configured to receive the data signals generated by the optical transmitters 102.
  • the multiplexers 104 may multiplex the received DWDM signals into a single DWDM signal. Both of the multiplexers 104 may be serially connected to an optical interleaver or 2-to-1 combiner 202 to which the multiplexed signals are sent.
  • the optical interleaver or 2-to-1 combiner 202 may receive the DWDM signal from each of the two multiplexers and interleave or combine the two signals into a single interleaved or combined DWDM signal.
  • the optical interleaver is used to refer to both the optical interleaver and the 2-to-1 combiner embodiments.
  • the first multiplexer 104 may provide signals with even DWDM channels and the second multiplexer 104 may provide signals with odd DWDM channels, which may then be interleaved by the optical interleaver 202 into a single DWDM signal.
  • the optical interleaver 202 may be serially connected to the first EDFA 106 and may send the interleaved signal to the first EDFA 106 for amplification prior to transmission over the SSMF link 108.
  • the second EDFA 1 12 may be serially connected to an optical deinterleaver 204.
  • the compensated, amplified DWDM signal produced by the second EDFA 12 may be sent to the optical deinterleaver 204, which may be configured to deinterleave the signal into two separate DWDM signals.
  • the deinterleaver 204 would take the form of a 1x2 splitter.
  • the optical deinterleaver 204 may deinterleave the compensated, amplified signal into a first signal of all even DWDM channels and a second signal of all odd DWDM channels.
  • the optical deinterleaver 204 may be serially connected with two demultiplexers 1 14 and may transmit the two signals generated via the deinterleaving to the respective two demultiplexers 1 14.
  • the two demultiplexers 1 14 may then demultiplex the signals into two sets of 50 Gb/s signals, each of which may be transmitted to by optical fibers to respective optical receivers 1 16.
  • the received 50 Gb/s signals are then input to the PAM4 chip 103, within an optical transceiver housed in a QSFP28 module, for example, that houses a pair of optical transmitters 102, a pair of optical receivers 1 16 and the PAM4 chip 103, in an exemplary embodiment.
  • the two demultiplexers 1 14 may demultiplex the DWDM signals into a number of wavelengths corresponding to the number of wavelengths multiplexed by the two multiplexers 104.
  • a tunable laser may be integrated with a Mach- Zehnder modulator in a transmit optical sub-assembly (called Tunable TOSA or T- TOSA).
  • Tunable TOSA transmit optical sub-assembly
  • a DWDM externally- modulated laser EML
  • CW continuous-wave
  • electro-absorption modulator EML
  • a fixed or a tunable CW laser can be used with a Mach-Zehnder modulator (MZM), and a driver amplifier.
  • MZM Mach-Zehnder modulator
  • a 100Gb/s optical transceiver module are composed of two optical transmitters described above, with two output optical fibers.
  • the EML can be optimized for 10G transceiver design.
  • the T-TOSA may have a tunable light source such as a tunable laser diode
  • the data transmission system 200 may include the optical combiner 204, as mentioned above.
  • the data transmission system 200 includes an optical combiner 202 configured to combine the DWDM signals from two 40 channel multiplexers 104, the receiving end of the data transmission system 200 uses an optical splitter 204 to separate the 40-channel even and 40-channle odd wavelengths.
  • a third EDFA (not illustrated) may be situated between the SMF link 108 and the dispersion compensator 1 10, and may be serially connected to each of the two components.
  • the third EDFA 302 may be configured to receive the signal transmitted via the SMF link 108 and may amplify the signal prior to compensation by the dispersion compensator 1 10.
  • the length of the SSMF link 108 and/or nature of the link and/or transmitted signal may be such that loss occurs during the transmission for which amplification is needed.
  • the third EDFA may amplify the signal such that the dispersion compensator 1 10 can compensate for any accumulated fiber CD.
  • the second EDFA 1 12 may still be used to amplify the signal once compensated, such as to account for loss suffered via the compensation done by the dispersion compensator 1 10.
  • a data transmission system that is a combination of the systems 100 and 200 may be used.
  • the transmitting end may use the optical interleaver 202 and two multiplexers 104 and the receiving end may not use the optical deinterleaver 204 and have a single demultiplexer 1 14, but might also use the third EDFA 302.
  • Such combinations may be used depending on the length of the SMF link 108, the amount of data being transmitted, the frequency or frequencies at which data is being transmitted, the type of dispersion compensator 1 10 being used, the type of optical transmitters 102 being used, the type of optical receivers 1 16 being used, etc.
  • the data transmission system may include one or more variable optical attenuators (VOAs), as mentioned above.
  • VOAs may be used for attenuation of the amplified signals, such as to ensure that amplified signals do not go above a predetermined threshold.
  • VOAs (not illustrated) may be serially connected to EDFAs, such as the first EDFA 106, second EDFA 1 2, and third EDFA (not illustrated), or may be included in the EDFAs as components thereof.
  • the data transmission system may also include additional components used to modify properties of the transmitted signals and/or data.
  • a digital signal processor may be used in the transmitting end of the data transmission system for pre-equalization of the signal, such as using a pre- Feed-Forward Equalizer (pre-FFE).
  • pre-FFE pre- Feed-Forward Equalizer
  • ER optical signal extinction ratio
  • Figs. 3(a) and 3(b) show a high capacity transmission system using a single wavelength in C-band, grey (near 1550nm) coherent-detection based modulation techniques.
  • Coherent detection based modulation techniques are known. See, e.g., Ezra Ip et al., "Coherent detection in optical fiber systems," Optics Express 753, Vol. 16, No. 2, pub. 9 Jan. 2008.
  • the system uses a pre-EDFA 106 and post-EDFA 1 12, relative to the SMF link 108.
  • a non-tunable, C-band laser used for a coherent system without DWDM.
  • the system does not use any optical component, including no EDFAs, between an optical transmitter and an optical receiver, which are connected by a single mode fiber link 108.
  • the components form a transceiver 301 , which might be housed in a single common form factor (CFP), such as CFP, CFP2, CFP4 or QSFP, and include a coherent Gray 1550 nm transmitter, a coherent receiver and a coherent digital signal processor (DSP).
  • CFP common form factor
  • DSP coherent digital signal processor
  • the coherent modulation technique can be known DP-QPSK (dual-polarization quadrature phase shift keying (DPQPSK) modulation, which involves the polarization multiplexing of two different QPSK signals) or DP-16QAM (conventional dual-polarization (DP) 16-ary quadrature amplitude modulation), and can be evolved to DP-nQAM (dual polarization quadrature amplitude modulations where, e.g., n>16.
  • the baud rate can be evolved from 28 ⁇ 32Gbaud to 45 ⁇ 64Gbaud or even higher.
  • FIG. 4 shows a high capacity transmission system using a single
  • a 1 x100G PAM4 transmitter 403 and 1X100G PAM4 receiver 403 controls a linear, gray 1310 nm transmitter and 402 linear receiver 412, transceivers 401 can be placed on each end of a single-mode-fiber (SMF) link 108.
  • the linear, gray 1310 nm transmitter can be in the form of a linear driver amplifier and a gray EML, and the receiver can be a PIN photodiode and a TIA.
  • the transmitter and receiver specifications are similar to those in Fig.
  • the optical amplifier is changed from EDFA to a 1.3 ⁇ optical semiconductor optical amplifier (SOA), and may be based on a 1 .3um directly modulated lasers (DML) or EML. Furthermore, as illustrated in Chan and Way, ("1 12 Gb/s PAM4 Transmission Over 40km SSMF Using 1.3pm Gain- Clamped Semiconductor Optical Amplifier," Optical Fiber Communications Conference (OFC), paper Th3A.4, March 2015) a gain-clamped SOA is preferred to increase the dynamic range of the SOA-based receiver.
  • an electronic chip including of an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), and digital- signal-processor (DSP) can be co-packaged in a module 301 and 401 , with the optical coherent transmitter and receiver.
  • the electronic chip can also be sitting outside the package 301 , 401 of the optical coherent transmitter and receiver in an alternative embodiment.
  • a product concept is a coherent transmitter using a non-tunable, C-band laser and a high-sensitivity coherent receiver without requiring DWDM multiplexer of
  • demultiplexer which can therefore do without EDFAs, if desired.
  • Fig. 5 illustrates a method 400 for the transmission of data in a data transmission system, such as the data transmission system 100 or 200 of Figs. 1 , and 2, respectively.
  • each of a plurality of optical transmitters may generate a signal of a plurality of signals, wherein each signal has a wavelength.
  • the plurality of optical transmitters may be direct detection-based pulse-amplitude-modulation with four amplitude level (PAM4) optical transmitters and comprise at least a digital-to-analog converter, a Mach- Zehnder modulator, and a tunable laser, or at least a digital-to-analog converter and a fixed-wavelength EML.
  • PAM4 amplitude level
  • a multiplexer (e.g., the multiplexer 104) serially connected to each of the plurality of optical transmitters may multiplex the signal generated by each optical transmitter into a single signal.
  • a first erbium-doped fiber amplifier (e.g., the first EDFA 106) serially connected to the multiplexer 104 may amplify the single signal.
  • the amplified single signal may be transmitted by a single-mode-fiber link (e.g., the SMF link 108) serially connected to the first EDFA.
  • the first EDFA may include a variable optical attenuator configured to attenuate the amplified signal prior to transmission via the single-mode-fiber link.
  • a dispersion compensator (e.g., the dispersion compensator 1 10) configured to receive the single DWDM signal transmitted by the single-mode- fiber link may compensate the single DWDM signal for accumulated fiber chromatic dispersion.
  • the dispersion compensator may be one of: a tunable dispersion compensator, a fixed dispersion compensator, a dispersion compensation fiber, and a combination thereof.
  • the method 400 may further include amplifying, by a third EDFA (e.g., the third EDFA 302) serially connected to the single-mode-fiber link, the transmitted signal, wherein the dispersion compensator is serially connected to the third EDFA, and where the transmitted single signal received by the dispersion compensator is the single DWDM signal amplified by the third EDFA.
  • a third EDFA e.g., the third EDFA 302
  • the transmitted single signal received by the dispersion compensator is the single DWDM signal amplified by the third EDFA.
  • the compensated single DWDM signal may be amplified by a second EDFA serially connected to the dispersion compensator.
  • a demultiplexer e.g., the demultiplexer 1 14
  • the second EDFA may include a variable optical attenuator configured to attenuate the transmitted single signal prior to demultiplexing by the demultiplexer.
  • the plurality of compensated signals may be received by a plurality of optical receivers (e.g., optical receivers 1 16), wherein each optical receiver is serially connected to the demultiplexer and configured to receive one of the plurality of compensated wavelengths.
  • each optical receiver may include at least a digital storage processor (DSP) configured to store process the respective received compensated signal.
  • DSP digital storage processor
  • a method employing the embodiments of Figs. 3(a), 3(b) and 4 are shown.
  • this method for transmitting data in a data transmission system comprises a step 602 of generating, by an optical coherent transmitter, an optical information signal using dual-polarization n-array quadrature-amplitude modulation (DP-nQAM) (n>4) with a data rate of >100Gb/s.
  • the optical information signal is amplified by a first erbium-doped fiber amplifier (EDFA) serially connected to the optical coherent transmitter.
  • EDFA erbium-doped fiber amplifier
  • the amplified optical information signal is transmitted by a single-mode-fiber (SMF) link serially connected to the first EDFA.
  • SMF single-mode-fiber
  • step 608 the transmitted optical information signal is amplified by a second EDFA serially connected to the SMF link.
  • the transmitted and amplified optical information signal is received by a coherent-detection-based 100Gb/s optical coherent receiver.
  • 50Gb/s implies a data rate from 50 to approximately 56Gb/s or higher
  • 00Gb/s implies a data rate from 00 to approximately 1 12Gb/s or higher, depending on the forward-error-correction overhead.
  • the number of EDFAs in a DWDM system can be more than two, as Fig.1 illustrated.
  • the same concepts can be extended to 200G or higher data rate optical transceivers through direct application of the inventive principles to higher
  • modulation rates higher constellations, and/or greater multiplicity of wavelength channels.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un module d'émetteur-récepteur de données, un système de transmission de données intégrant celui-ci et des procédés qui y sont associés, qui comprennent des émetteurs optiques configurés pour recevoir un signal porteur d'informations et générer un signal optique présentant une longueur d'onde différente des longueurs d'ondes générées par d'autres émetteurs optiques parmi la pluralité d'émetteurs optiques; des récepteurs optiques configurés pour recevoir un signal optique présentant une longueur d'onde correspondant à un émetteur optique de la pluralité d'émetteurs optiques et le convertir en un signal électrique porteur d'informations; et une puce de modulateur d'impulsions en amplitude de niveau quatre (PAM4) qui génère un signal porteur d'informations modulées d'impulsions en amplitude fourni en entrée vers au moins un émetteur optique de la pluralité d'émetteurs optiques et reçoit le porteur d'informations à partir d'au moins un récepteur optique de la pluralité de récepteurs optiques et le convertit en un signal d'informations au moyen d'une démodulation d'impulsions en amplitude. D'autres modes de réalisation comprennent un émetteur cohérent et un récepteur cohérent optiques se basant sur une détection cohérente.
PCT/US2015/051124 2014-09-19 2015-09-21 Multiplexage par répartition en longueur d'onde dense et systèmes de transmission à une seule longueur d'onde WO2016044822A1 (fr)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018014565A1 (fr) * 2016-07-20 2018-01-25 上海诺基亚贝尔股份有限公司 Procédé et dispositif d'envoi et de réception de données
CN112636834A (zh) * 2019-09-24 2021-04-09 李政 主动式光缆与主动式电缆的复合系统与其光收发系统
GB2595862A (en) * 2020-06-08 2021-12-15 Rushmere Tech Limited Optical apparatus and associated methods
WO2021250393A1 (fr) 2020-06-08 2021-12-16 Rushmere Technology Limited Appareil optique et procédés associés pour générer des signaux optiques afin d'améliorer la quantité de données dans un réseau optique
CN113922914A (zh) * 2020-07-09 2022-01-11 慧与发展有限责任合伙企业 密集波分复用（dwdm）硅光子接收器的波长控制和监测
CN115276875A (zh) * 2022-07-18 2022-11-01 希烽光电科技(南京)有限公司 100g超长距离通信光模块及波分复用系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080069570A1 (en) * 2006-09-15 2008-03-20 John Dallesasse Optical transceiver for 100 Gigabit/second transmission
US20090110408A1 (en) * 2007-10-31 2009-04-30 Emcore Corporation Laser Optical Transmission System with Dual Modulation
US20120207470A1 (en) * 2011-02-15 2012-08-16 Nec Laboratories America, Inc. Spatial domain based multi dimensional coded modulation for multi tb per second serial optical transport networks
US20140169789A1 (en) * 2012-09-11 2014-06-19 Inphi Corporation Optical communication interface utilizing coded pulse amplitude modulation
WO2014130386A1 (fr) * 2013-02-25 2014-08-28 Alcatel-Lucent Usa Inc. Espacement de niveau pour des systèmes optiques de type m-pam avec détection cohérente

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080069570A1 (en) * 2006-09-15 2008-03-20 John Dallesasse Optical transceiver for 100 Gigabit/second transmission
US20090110408A1 (en) * 2007-10-31 2009-04-30 Emcore Corporation Laser Optical Transmission System with Dual Modulation
US20120207470A1 (en) * 2011-02-15 2012-08-16 Nec Laboratories America, Inc. Spatial domain based multi dimensional coded modulation for multi tb per second serial optical transport networks
US20140169789A1 (en) * 2012-09-11 2014-06-19 Inphi Corporation Optical communication interface utilizing coded pulse amplitude modulation
WO2014130386A1 (fr) * 2013-02-25 2014-08-28 Alcatel-Lucent Usa Inc. Espacement de niveau pour des systèmes optiques de type m-pam avec détection cohérente

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018014565A1 (fr) * 2016-07-20 2018-01-25 上海诺基亚贝尔股份有限公司 Procédé et dispositif d'envoi et de réception de données
US11128377B2 (en) 2016-07-20 2021-09-21 Alcatel Lucent Method and device of transmitting and receiving data
CN112636834A (zh) * 2019-09-24 2021-04-09 李政 主动式光缆与主动式电缆的复合系统与其光收发系统
GB2595862A (en) * 2020-06-08 2021-12-15 Rushmere Tech Limited Optical apparatus and associated methods
WO2021250393A1 (fr) 2020-06-08 2021-12-16 Rushmere Technology Limited Appareil optique et procédés associés pour générer des signaux optiques afin d'améliorer la quantité de données dans un réseau optique
CN113922914A (zh) * 2020-07-09 2022-01-11 慧与发展有限责任合伙企业 密集波分复用（dwdm）硅光子接收器的波长控制和监测
CN115276875A (zh) * 2022-07-18 2022-11-01 希烽光电科技(南京)有限公司 100g超长距离通信光模块及波分复用系统

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