CN116632641A - Novel self-oscillating optical frequency comb generator - Google Patents

Novel self-oscillating optical frequency comb generator Download PDF

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Publication number
CN116632641A
CN116632641A CN202310636708.5A CN202310636708A CN116632641A CN 116632641 A CN116632641 A CN 116632641A CN 202310636708 A CN202310636708 A CN 202310636708A CN 116632641 A CN116632641 A CN 116632641A
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optical
frequency comb
mode fiber
loop
oscillating
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Inventor
哈特
刘博�
任建新
毛雅亚
吴翔宇
夏文超
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/136—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity
    • H01S3/137—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling devices placed within the cavity for stabilising of frequency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

The invention discloses a novel self-oscillating optical frequency comb generator, which is characterized in that an OEO loop A is matched with a continuous spectrum laser and an optoelectronic oscillator for use in generating an optical frequency comb; a signal separation component connected to the OEO loop a through an optical demultiplexer a of 1x15 for generating real and imaginary signals; the transmission channel is connected with the signal separation assembly through the optical demultiplexer B of 1x15 and is used for signal transmission; the decoding component is connected with the transmission channel and is used for recovering the real part and the imaginary part signals and performing decoding processing; wherein the OEO loop a comprises a single mode fiber A, PIN photodetector, an electrical amplifier a, and a bandpass bessel filter; the error vector size, the bit error rate, the symbol error rate, the Q factor and the clear constellation diagram of the received signal of the 300Gbps116-QAM transmission receiving channel are strong, and the applicability in coherent optical communication is high.

Description

Novel self-oscillating optical frequency comb generator
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a novel self-oscillating optical frequency comb generator.
Background
With the increasing transmission capacity of optical fiber communications, there is a lot of attention in increasing the number of WDM channels in order to obtain high data rates.
However, this approach also increases the complexity of the photoelectric conversion and will result in a much higher data rate than the photoelectric transmitter and receiver can handle.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a novel self-oscillating optical frequency comb generator, which solves the problems.
In order to achieve the above purpose, the invention is realized by the following technical scheme: a new self-oscillating optical frequency comb generator comprising:
the OEO loop A is matched with the continuous spectrum laser and the photoelectric oscillator for use and is used for generating an optical frequency comb;
a signal separation component connected to the OEO loop a through an optical demultiplexer a of 1x15 for generating real and imaginary signals;
the transmission channel is connected with the signal separation assembly through the optical demultiplexer B of 1x15 and is used for signal transmission;
the decoding component is connected with the transmission channel and is used for recovering the real part and the imaginary part signals and performing decoding processing;
the OEO loop A comprises a single-mode fiber A, PIN photoelectric detector, an electric amplifier A and a band-pass Bessel filter, wherein the PIN photoelectric detector is connected with the electric amplifier A and the single-mode fiber A, the single-mode fiber A is connected with an external signal and a connection spectrum laser, the band-pass Bessel filter is connected with the photoelectric oscillator, and the single-mode fiber is connected with a signal separation assembly through a 1x15 optical demultiplexer A.
Based on the technical scheme, the invention also provides the following optional technical schemes:
the technical scheme is as follows: the signal separation assembly comprises a rectangular optical filter, a 16QAM modulator A and a beam splitter A, wherein the rectangular optical filter is connected with a single-mode optical fiber A through a 1x15 optical demultiplexer A, and the beam splitter A is connected with a transmission channel through a 15x1 optical multiplexer.
The technical scheme is as follows: the transmission channel comprises a loop structure of a single-mode fiber B and a photoelectric amplifier B, wherein the single-mode fiber B is connected with a beam splitter A through a 15x1 optical multiplexer, and the photoelectric amplifier is connected with the single-mode fiber B.
The technical scheme is as follows: the decoding assembly comprises a 90-degree optical mixer, a DSP digital signal processing module, a judging module and a 16QAM receiver, wherein the DSP digital signal processing module is connected with the judging module and the 90-degree optical mixer, the 90-degree optical mixer is connected with a single-mode optical fiber B through a 1x15 optical demultiplexer B, and the judging module is connected with the 16QAM receiver.
The technical scheme is as follows: further comprises: the homodyne receiving structure is connected with a single-mode optical fiber B through an optical demultiplexer B of 1x15 and is used for generating a new self-oscillating optical frequency comb, and comprises an optoelectronic oscillator B, OEO loop B, a single-mode optical fiber C and an optical demultiplexer C of 1x15, wherein the OEO loop B is identical to the OEO loop A in structure, and the OEO loop B is connected with the optoelectronic oscillator B and the optical demultiplexer B of 1x 15.
The technical scheme is as follows: the 16QAM modulator a input bit stream is generated by a pseudo-random bit sequencer.
The technical scheme is as follows: the beam splitter A is a beam splitter injected into an in-phase light modulator and a four-phase light modulator.
The technical scheme is as follows: the loop structure of the single-mode fiber B comprises 80km single-mode fibers and is matched with the optical gain of the photoelectric amplifier to be 18dB, and the loop structure of the single-mode fiber B uses three cross-loops in total.
Advantageous effects
The invention provides a new self-oscillating optical frequency comb generator, which has the following advantages compared with the prior art
The beneficial effects are that:
1. in the OFC generation scheme, the microwave signal is replaced by a generated opto-electronic oscillator defining the frequency interval between the generated carriers, in general 15 carriers are generated, wherein the center carrier on the receiving side is used to generate a local oscillator optical frequency comb (LO-OFC), the left and right carriers are used for 1 single mode fiber A6QAM data modulation of 80km to 240km single mode fiber, the error vector size, bit error rate, symbol error rate and Q factor of the received signal of the transmission receiving channel of 300Gbps116-QAM over uncompensated fiber links of 80km to 240km standard single mode fiber and their clear constellations strongly support the applicability of the proposed scheme in coherent optical communication.
Drawings
Fig. 1 is a schematic diagram of the self-oscillating optical frequency comb generation scheme of the present invention and its deployment in a coherent 16QAM transmission network.
Fig. 2 shows the generation result (a) of the OFC generation scheme of the present invention and the generation of the optical frequency comb by the local oscillator (b).
Fig. 3 shows simulation results and constellation diagrams of the carriers 193.08THz and 193 of the invention in the transmission of the optical fiber from 80km to 240km of single-mode fiber B12 THz.
Fig. 4 shows the error vector magnitude and Q factor of the present invention.
Reference numerals annotate: 1. an optoelectronic oscillator A; 2. a continuous spectrum laser; 3. a band-pass Bessel filter; 4. an electric amplifier; 5. a PIN photodetector; 6. a single mode optical fiber A; 7. an optical demultiplexer a; 8. a rectangular optical filter; 9. a beam splitter A; 10. a 16QAM modulator A; 11. an optical multiplexer; 12. a single mode optical fiber B; 13. an optical demultiplexer B; 14. a 90 ° optical mixer; 15. a DSP digital signal processing module; 16. a judging module; 17. a 16QAM receiver; 18. an optoelectronic oscillator B; 19. an optical demultiplexer C; 20. OEO loop B.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Specific implementations of the invention are described in detail below in connection with specific embodiments.
Referring to fig. 1 to 4, a new self-oscillating optical frequency comb generator according to an embodiment of the present invention includes:
the OEO loop A is matched with the continuous spectrum laser 2 and the photoelectric oscillator A1 for use and is used for generating an optical frequency comb;
a signal separation component connected to the OEO loop a through an optical demultiplexer A7 of 1x15 for generating real and imaginary signals;
the transmission channel is connected with the signal separation assembly through the optical demultiplexer B of 1x15 and is used for signal transmission;
the decoding component is connected with the transmission channel and is used for recovering the real part and the imaginary part signals and performing decoding processing;
the OEO loop A comprises a single-mode fiber A6, a PIN photoelectric detector 5, an electric amplifier A4 and a band-pass Bessel filter 3, wherein the PIN photoelectric detector 5 is connected with the electric amplifier A4 and the single-mode fiber A6, the single-mode fiber A6 is connected with an external signal and a connection spectrum laser, the band-pass Bessel filter 3 is connected with a photoelectric oscillation A1, and the single-mode fiber is connected with a signal separation component through A1 x15 optical demultiplexer A7.
Specifically, the signal separation component comprises a rectangular optical filter 8, a 16QAM modulator a10 and a beam splitter A9, wherein the rectangular optical filter 8 is connected with a single-mode optical fiber A6 through A1 x15 optical demultiplexer A7, the 16QAM modulator a10 is connected with the beam splitter A9, the beam splitter A9 is connected with a transmission channel through a 15x1 optical multiplexer 11, an input bit stream of the 16QAM modulator a10 is generated by a Pseudo Random Bit Sequencer (PRBS), and the beam splitter A9 is a beam splitter injected into an in-phase optical modulator and a four-phase optical modulator. The OEO loop a is matched with an optical frequency comb generated by the continuous spectrum laser 2 and the photoelectric oscillator A1 to perform de-multiplexing processing through an optical de-multiplexer A7 of 1x15, and the de-multiplexed signal sequentially passes through a rectangular optical filter 8 for performing filtering processing on the signal and a 16QAM modulator a10, and the signal passing through the 16QAM modulator a10 is divided into a real part and an imaginary part (I and Q) through a fractional device a.
Specifically, the transmission channel includes a loop structure of a single-mode fiber B12 and an optical amplifier, the single-mode fiber B12 is connected with the beam splitter A9 through an optical multiplexer 11 of 15x1, the optical amplifier is connected with the single-mode fiber B12, the optical amplifier is connected with the decoding component through an optical demultiplexer B13 of 1x15, the loop structure of the single-mode fiber B12 includes 80km single-mode fiber per span loop and matches with an optical gain 18dB of the optical amplifier, and the loop structure of the single-mode fiber B12 uses three spans. The purpose of this arrangement is to maintain transmission advantages using the loop structure of single mode fiber B12 in conjunction with optical amplifier B which maintains optical signal gain.
In the above example, it should be appreciated by those skilled in the art that the number of the loops of the loop structure of the single-mode fiber B12 is set according to the requirement, not just three.
Specifically, the decoding component includes a 90 ° optical mixer 14, a DSP digital signal processing module 15, a decision module 16, and a 16QAM receiver 17, where the DSP digital signal processing module 15 is connected to the decision module 16 and the 90 ° optical mixer 14, and the 90 ° optical mixer 14 is connected to a single-mode optical fiber B12 through a1×15 optical demultiplexer B13, and the decision module 16 is connected to the 16QAM receiver 17. The 90 ° optical mixer 14 receives signals through the optical demultiplexer B of 1×15 and restores real and imaginary parts (I and Q) of the signals, transmits to the DSP digital signal processing module 15 to perform DSP off-line processing, then makes decisions, and the decided signals are subjected to decoding processing by the 16QAM modulator.
Specifically, the method further comprises the following steps: a homodyne receiving structure, connected to the single-mode optical fiber B12 through the optical demultiplexer B13 of 1x15, for generating a new self-oscillating optical frequency comb, the homodyne receiving structure comprising an optoelectronic oscillator B18, an OEO loop B20 and the optical demultiplexer C19 of 1x15, the OEO loop B20 being identical to the OEO loop a structure, the OEO loop B20 being connected to the optoelectronic oscillator B18 and the optical demultiplexer B13 of 1x 15. An optical homodyne receiver architecture is used in which the Local Oscillator (LO) source is replaced by the same OFC source used at the transmitter side, as shown in fig. 1, however, the laser source is replaced by a central carrier frequency (193.1 THz) which is reserved for generating the LO self-oscillating OFC source.
In the embodiment of the invention, an OEO loop A receives one of the two paths of signals which are separated into two paths, an optical frequency comb is generated by matching an optoelectronic oscillator A1 and a continuous spectrum laser 2, the generated optical frequency comb is subjected to de-multiplexing processing through A1 x15 optical de-multiplexer A7, the de-multiplexed signals sequentially pass through a rectangular optical filter 8 for filtering the signals and a 16QAM modulator A10, the signals passing through the 16QAM modulator A10 are divided into a real part and an imaginary part (I and Q) through a fractional device A, a 15x1 optical multiplexer 11 is adopted to jointly modulate a carrier wave and inject data into a transmission channel and transmit the signals to a decoding component through the transmission channel, the transmission channel maintains the transmission advantage through a loop structure of a single mode optical fiber B12 and an optical amplifier B for maintaining the gain of the optical signals, the optical signals are separated and each carrier is identified at the decoding assembly using A1 x15 optical demultiplexer B with the same number of channels, the identified carriers are transmitted to a 90 ° optical hybrid 14 to recover the real and imaginary parts (I and Q) of the signals and transmitted to a DSP digital signal processing module 15 for DSP off-line processing and then decision is made, the decided signals are decoded by a 16QAM receiver 17, while the separated optical signals at the receiving end are passed through a homodyne receiving structure comprising OEO loop a, the Local Oscillator (LO) source of the homodyne receiving structure is replaced by the same OFC source used at the transmitter end, the laser source is replaced by a central carrier frequency (193.1 THz) reserved for generating the LO self-oscillating OFC source.
The simulation results are shown in fig. 2, and the generated comb contains 15 carrier frequencies and has high carrier-to-noise ratio. The results of the generated OFC and self-oscillating local oscillator can be seen in fig. 2. It can be seen that the amplitude differences vary from left to right. These carriers are filtered using rectangular optical filters 8 and passed through a 16QAM modulator alone, with 20Gb data rates being overlaid on each carrier. The filtered signal is split into real and imaginary parts (I and Q) using a beam splitter injected into an in-phase and quadrature-phase (IQ) optical modulator. The signals from both ends are combined using an optical combiner to produce the desired 16QAM signal.
The system provided by the patent has good performance in terms of bit error rate, symbol error rate and Q factor. Fig. 3 shows BER performance of the proposed scheme for different fiber spans. It can be seen that this scheme provides the best results for 80km and 160km of fiber optic transmission, with BER values of 240km still below the threshold. In addition, the constellation of channels 1 and 2 can also be seen in the inset of fig. 3. Meanwhile, the error vector size, bit error rate, symbol error rate and Q factor of the reception channel can be seen in fig. 4. From the results obtained, it can be concluded that the proposed OFC generation scheme has potential to be deployed in a1 single mode fiber A6QAM coherent optical communication system with an optical fiber span of 80km to 240 km.
The invention is based on the SO-OFC generator at the OLT and ONU side, replaces the laser array at the OLT side as a transmitter, and is used as a local oscillator source at the ONU side. EAM provides better performance in terms of lower power consumption and faster response than traditional LiNbO3 MZM. Meanwhile, EAMs have been widely used as transmitters in high-speed and long-range optical communication systems due to their ease of integration with relatively small-sized lasers. The self-oscillating OFC is generated by a cascade configuration of EAM and polarization controller. The self-oscillating loop is configured by using a high-speed PIN photodetector, an electrical amplifier 4, a standard single-mode fiber and a bandpass bessel filter 3. 20gbps 16qam data is modulated on each carrier and without the use of dispersion compensating fibers in the transmission line. At the receiving end, a gaussian optical filter is used to identify the carrier signal and the in-phase and quadrature phases of the input signal are detected using a 16QAM receiver 17.
In the OFC generation scheme, the microwave signals are replaced by generated optoelectronic oscillators, the oscillators define the frequency intervals among generated carriers, in general, 15 carriers are generated, wherein a central carrier at a receiving side is used for generating a local oscillator optical frequency comb (LO-OFC), left and right carriers are used for 1 single mode fiber A6QAM data modulation of 80km to 240km single mode fibers, error vector magnitude, bit error rate, symbol error rate and Q factor of a received signal of a 300Gbps116-QAM transmission receiving channel are transmitted on an uncompensated optical fiber link of 80km to 240km standard single mode fibers, and the applicability of the proposed scheme in coherent optical communication is strongly supported by clear constellations thereof.
It is noted that in this document, relational terms such as first, second, a, and B, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A new self-oscillating optical frequency comb generator, further comprising:
the OEO loop A is matched with the continuous spectrum laser (2) and the photoelectric oscillator A (1) for use and is used for generating an optical frequency comb;
a signal separation component connected to the OEO loop a through an optical demultiplexer a (7) of 1x15 for generating real and imaginary signals;
the transmission channel is connected with the signal separation assembly through the optical demultiplexer B of 1x15 and is used for signal transmission;
the decoding component is connected with the transmission channel and is used for recovering the real part and the imaginary part signals and performing decoding processing;
the OEO loop A comprises a single-mode fiber A (6), a PIN photoelectric detector (5), an electric amplifier A (4) and a band-pass Bessel filter (3), wherein the PIN photoelectric detector (5) is connected with the electric amplifier A (4) and the single-mode fiber A (6), the single-mode fiber A (6) is connected with an external signal and a connection spectrum laser, the band-pass Bessel filter (3) is connected with the photoelectric oscillator A (1), and the single-mode fiber is connected with a signal separation assembly through an optical demultiplexer A (7) of 1x 15.
2. The new self-oscillating optical frequency comb generator according to claim 1, characterized in that the signal separation assembly comprises a rectangular optical filter (8), a 16QAM modulator a (10) and a beam splitter a (9), the rectangular optical filter (8) being connected to the single-mode optical fiber a (6) by a 1x15 optical demultiplexer a (7), the beam splitter a (9) being connected to the transmission channel by a 15x1 optical multiplexer (11).
3. The new self-oscillating optical frequency comb generator according to claim 1, characterized in that the transmission channel comprises a loop structure of a single-mode fiber B (12) and an optical amplifier B, the single-mode fiber B (12) being connected to the beam splitter a (9) by a 15x1 optical multiplexer (11), the optical amplifier being connected to the single-mode fiber B (12).
4. A new self-oscillating optical frequency comb generator according to claim 3, characterized in that the decoding assembly comprises a 90 ° optical mixer (14), a DSP digital signal processing module (15), a decision module (16) and a 16QAM receiver (17), the DSP digital signal processing module (15) being connected to the decision module (16) and to the 90 ° optical mixer (14), the 90 ° optical mixer (14) being connected to the single-mode optical fiber B (12) via a 1x15 optical demultiplexer B (13), the decision module (16) being connected to the 16QAM receiver (17).
5. The new self-oscillating optical frequency comb generator of claim 3, further comprising: a homodyne receiving structure connected with a single-mode optical fiber B (12) through an optical demultiplexer B (13) of 1x15 and used for generating a new self-oscillating optical frequency comb, wherein the homodyne receiving structure comprises an optoelectronic oscillator B (18), an OEO loop B (20) and an optical demultiplexer C (19) of 1x15, the OEO loop B (20) is identical to the OEO loop A in structure, and the OEO loop B (20) is connected with the optoelectronic oscillator B (18) and the optical demultiplexer B (13) of 1x 15.
6. The new self-oscillating optical frequency comb generator of claim 2, characterized in that the 16QAM modulator a (10) input bit stream is generated by a pseudo-random bit sequencer.
7. A new self-oscillating optical frequency comb generator according to claim 2, characterized in that the beam splitter a (9) is a beam splitter injected into an in-phase optical modulator and a four-phase optical modulator.
8. A new self-oscillating optical frequency comb generator according to claim 3, characterized in that the loop structure of the single-mode fiber B (12) comprises 80km of single-mode fiber per span loop and cooperates with the optical gain of the photo-amplifier by 18dB, and the loop structure of the single-mode fiber B (12) uses three spans in total.
CN202310636708.5A 2023-06-01 2023-06-01 Novel self-oscillating optical frequency comb generator Pending CN116632641A (en)

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