CN111224719A - Coherent optical communication device and single-fiber bidirectional dual-wavelength transmission method - Google Patents
Coherent optical communication device and single-fiber bidirectional dual-wavelength transmission method Download PDFInfo
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- CN111224719A CN111224719A CN202010138097.8A CN202010138097A CN111224719A CN 111224719 A CN111224719 A CN 111224719A CN 202010138097 A CN202010138097 A CN 202010138097A CN 111224719 A CN111224719 A CN 111224719A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
Abstract
The invention discloses a coherent optical communication device, which comprises a transmitting device and a receiving device, wherein the transmitting device comprises: a first laser for generating an optical carrier having a first wavelength; the transmitting unit is used for modulating the transmitted electric signal onto the optical carrier to form a transmitted optical signal for transmission; the receiving apparatus includes: the receiving unit is used for mixing the received optical signal with the local oscillator light and obtaining a received electrical signal after demodulation. Correspondingly, the invention also discloses a single-fiber bidirectional dual-wavelength transmission method. The invention realizes the sending and receiving of signals with different wavelengths in a single-fiber bidirectional transmission system.
Description
Technical Field
The invention relates to the technical field of coherent optical communication, in particular to a coherent optical communication device and a single-fiber bidirectional dual-wavelength transmission method.
Background
Coherent optical communication mainly utilizes coherent adjustment and heterodyne detection technology, and has advantages such as sensitivity height, long relay distance, selectivity number and communication capacity are big. The reception sensitivity using the coherent detection technique provides about 10db to 20db compared to the incoherent communication system, which greatly extends the transmission distance. The operation process of the coherent optical communication system is as follows: the information to be transmitted is modulated onto an optical carrier at a transmitting end and then transmitted through an optical fiber, and at a receiving end, the received light beam and local oscillator light are firstly subjected to coherent coupling, and then the light beam subjected to coherent coupling is used for detection.
The traditional coherent optical module comprises a transmitting part and a receiving part, wherein the transmitting part and the receiving part share one laser, and local oscillation light for the receiving part is generated by the laser, so that optical modules of communication equipment at two ends of a transmission optical fiber link work on the same wavelength. In a single-fiber bidirectional transmission system, when the coherent optical module is used, because the transmission and the reception are the same wavelength in single-fiber bidirectional transmission, noise generated by reverse dispersion of Rayleigh greatly affects the long-distance single-fiber bidirectional transmission system.
Disclosure of Invention
In view of this, the present invention provides a coherent optical communication device and a single-fiber bidirectional dual-wavelength transmission method, which implement sending and receiving of signals with different wavelengths in a single-fiber bidirectional transmission system.
In order to achieve the above object, the present invention provides a coherent optical communication device, applied to a coherent optical communication system, the device comprising a transmitting device and a receiving device, wherein,
the transmission apparatus includes:
a first laser for generating an optical carrier having a first wavelength;
the transmitting unit modulates the transmitted electric signal onto the optical carrier to form a transmitted optical signal for transmission;
the receiving apparatus includes:
the second laser generates local oscillation light with a second wavelength;
and the receiving unit is used for mixing the received optical signal with the local oscillator light and obtaining a received electric signal after demodulation.
Preferably, the first laser is a first tunable laser, and the second laser is a second tunable laser.
Preferably, the transmitting apparatus further comprises a first configuration unit, wherein,
the first configuration unit is used for configuring the output wavelength of the first tunable laser to be a first wavelength;
the first tunable laser outputs an optical carrier with a first wavelength based on the configuration of the first configuration unit.
Preferably, the receiving means comprises a second configuration unit, wherein,
the second configuration unit is used for configuring the output wavelength of the second tunable laser to be a second wavelength;
the second tunable laser outputs local oscillator light with a second wavelength based on the configuration of the second configuration unit.
Preferably, the receiving apparatus includes a receiving unit and a control unit, wherein,
the receiving unit outputs a receiving indication signal to the control unit when receiving the optical signal; the control unit is used for directly or indirectly detecting the wavelength of the received optical signal after acquiring the receiving indication signal and automatically controlling the output wavelength of the second tunable laser according to the detection result;
and the second tunable laser outputs local oscillator light according to the control result of the control unit.
Preferably, the control unit includes a grating unit, configured to adjust a grating angle, drop the optical signal received by the receiving unit on the detector, and obtain the grating angle when the intensity of the electrical signal is strongest, where a wavelength of the optical signal corresponding to the grating angle is a wavelength of the local oscillation light.
Preferably, the control unit includes an adjusting unit, configured to acquire a frequency and a phase of each optical signal output by the second tunable laser, perform difference frequency output on each optical signal and the received optical signal by using a second order mixing effect, and when the difference frequency is zero, a wavelength of a corresponding optical signal is used as a wavelength of the coherent received local oscillator light.
In order to achieve the above object, the present invention provides a single-fiber bidirectional dual-wavelength transmission method, which includes:
outputting an optical carrier wave with a first wavelength through a first laser, modulating a sent electric signal onto the optical carrier wave to form a sent optical signal, and transmitting the sent optical signal through an optical fiber;
and generating local oscillator light with a second wavelength by a second laser, mixing the optical signal received by the optical fiber with the local oscillator light, and demodulating to obtain a received electrical signal, wherein the second wavelength is different from the first wavelength.
Preferably, the method further comprises:
the first laser is a first tunable laser, and the second laser is a second tunable laser;
configuring the output wavelength of the first tunable laser to be a first wavelength, and controlling the first tunable laser to output an optical carrier wave of the first wavelength;
modulating the transmitted electric signal to the optical carrier wave with the first wavelength to form a transmitted optical signal for transmission;
when an optical signal is received, directly or indirectly detecting the wavelength of the received optical signal, and automatically controlling the output wavelength of the second tunable laser according to the detection result;
the second tunable laser outputs local oscillator light according to the control result;
and mixing the received optical signal with the local oscillator light, and demodulating to obtain a received electrical signal.
To achieve the above object, the present invention provides a communication apparatus, characterized by comprising the coherent optical communication device as described above.
Compared with the prior art, the invention provides a coherent optical communication device and a single-fiber bidirectional dual-wavelength transmission method, which bring the following beneficial effects: the coherent optical communication device adopts two independent lasers for sending and receiving, and the receiving side and the sending side realize the receiving and sending of signals based on two independent wavelength optical signals output by the two independent lasers; the single-fiber bidirectional signal receiving and transmitting device realizes the transmission and the reception of signals with different wavelengths; the optical signal wavelength automatic scanning mechanism is used for adaptively controlling the local oscillator optical wavelength of the receiving end, so that the configuration of the coherent optical communication device is more flexible.
Drawings
Fig. 1 is a system block diagram of a coherent optical communication device in accordance with an embodiment of the present invention.
Fig. 2 is a flowchart of a single-fiber bidirectional dual-wavelength transmission method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the specific embodiments shown in the drawings, which are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to the specific embodiments are included in the scope of the present invention.
In one embodiment of the present invention as shown in fig. 1, the present invention provides a coherent optical communication device, which is applied to a coherent optical communication system, and comprises a transmitting device 10 and a receiving device 11, wherein,
the transmission apparatus 10 includes:
a first laser 100 that generates an optical carrier having a first wavelength;
a transmitting unit 101, which modulates the transmitted electrical signal onto the optical carrier to form a transmitted optical signal for transmission;
the receiving device 11 includes:
a second laser 110 that generates local oscillation light having a second wavelength;
and the receiving unit 111 mixes the received optical signal with the local oscillator light, and demodulates the mixed optical signal to obtain a received electrical signal.
The coherent optical communication device adopts two independent lasers in the transmitting device and the receiving device, and the two independent lasers respectively provide two optical signals with independent wavelengths for the signals at the transmitting side and the receiving side, so that the transmission of double-fiber bidirectional signals or the transmission and the reception of signals with different wavelengths in a single-fiber bidirectional mode can be realized. The first laser of the transmitting device generates an optical carrier with a first wavelength. The transmitting unit modulates the transmitted electrical signal onto the optical carrier, forms a transmitted optical signal through signal coding, polarization control and the like, and transmits the optical signal through an optical fiber. And a second laser of the receiving device generates local oscillator light with a second wavelength. The second wavelength may or may not be equal to the first wavelength. Configured accordingly to the particular system application. The receiving unit mixes the received optical signal from the optical fiber with the local oscillator light, the mixed optical signal is subjected to photoelectric detection, amplification and filtering and the like, and the received electrical signal is obtained after demodulation, so that the required signal is obtained. Since the first wavelength of the first laser and the second wavelength of the second laser of the coherent optical communication device are both default configurations and are already set at the time of factory shipment, in the coherent optical communication system, pairing needs to be performed according to the wavelengths supported by the respective coherent optical communication devices of the two end devices. In an application scenario of this embodiment, a single-fiber bidirectional different-wavelength transmission system is taken as an example, the coherent optical communication system includes a local device and an opposite device, and the coherent optical communication device is applied to the local device and the opposite device respectively. If the factory configuration of the wavelength of the first laser at the transmitting end of the coherent optical communication device of the home terminal equipment is λ 1, and the factory configuration of the wavelength of the second laser at the receiving end thereof is λ 2, the coherent optical communication device of the opposite terminal equipment communicating with the home terminal equipment is configured to: the wavelength of the second laser at the receiving end of the optical fiber is lambda 1, and the wavelength of the first laser at the transmitting end of the optical fiber is lambda 2, so that single-fiber bidirectional transmission of signals with different wavelengths is realized.
In the above embodiment, two fixed lasers in the coherent optical communication device are already configured in factory settings, and in practical application, the coherent optical communication devices in the two devices need to be paired according to the configuration in factory settings, so that the application configuration is not flexible. A tunable laser is a laser that can continuously vary the laser output wavelength over a range. By the characteristic of tunable laser wavelength change, two independent lasers of the coherent optical communication device can be wavelength configured.
According to an embodiment of the present invention, the transmitting apparatus includes a first configuration unit. The first configuration unit configures an output wavelength of the first tunable laser to be a first wavelength. The first tunable laser outputs an optical carrier with a first wavelength based on the configuration of the first configuration unit. The first tunable laser may output a plurality of wavelengths. According to different application occasions of the coherent optical communication device, different wavelengths are set for the output wavelength of the first tunable laser. And the transmitting unit modulates the transmitted electric signal onto the optical carrier wave with the first wavelength to form a transmitted optical signal for transmission. The receiving means comprises a second configuration unit. The second configuration unit configures an output wavelength of the second tunable laser to be a second wavelength. The second tunable laser outputs local oscillation light with a second wavelength based on the configuration of the second configuration unit. And the receiving unit mixes the received optical signal with the local oscillator light with the second wavelength and obtains a received electric signal after demodulation. In an application scenario of this embodiment, if the wavelength of the first tuned laser at the transmitting end of the coherent optical communication device in the local device is configured as λ 1, the wavelength of the second tuned laser at the receiving end of the coherent optical communication device in the opposite device is configured as λ 1. If the wavelength of the first tuned laser at the transmitting end of the coherent optical communication device of the opposite-end device is configured to be λ 2, the wavelength of the second tuned laser at the receiving end of the coherent optical communication device in the local-end device is configured to be λ 2. Based on the embodiment, the wavelengths of the two tunable lasers at the transmitting end and the receiving end of the coherent optical communication device can be configured, so that the configuration of the optical communication devices related to the local end equipment and the opposite end equipment is flexible, and the networking configuration can be more flexibly performed.
In another preferred embodiment of the present invention, the receiving side of the coherent optical communication device adaptively controls the wavelength of the local oscillator light by an automatic scanning detection mechanism for the received optical signal. Specifically, the first configuration unit of the transmitting apparatus configures the output wavelength of the first tunable laser to be a first wavelength. The first tunable laser outputs an optical carrier with a first wavelength based on the configuration of the first configuration unit. And the transmitting unit modulates the transmitted electric signal onto the optical carrier wave with the first wavelength to form a transmitted optical signal for transmission. The receiving device comprises a receiving unit and a control unit. The receiving unit is used for outputting a receiving indication signal to the control unit when receiving the optical signal. The sending end of the coherent optical communication device of the opposite end equipment sends an optical signal and transmits the optical signal to the local end equipment through the optical fiber, and the receiving unit of the local end equipment receives the optical signal. And the control unit directly or indirectly detects the wavelength of the received optical signal after acquiring the receiving indication signal and automatically controls the output wavelength of the second tunable laser according to the detection result. And the second tunable laser outputs local oscillator light according to the control result of the control unit. When the receiving device receives an optical signal from opposite-end equipment, the second tunable laser is controlled to output a plurality of optical signals with different wavelengths according to a preset wavelength interval, the wavelength of the tunable range of the second tunable laser is covered comprehensively, homodyne receiving detection is carried out on the signal light with each adjustable wavelength and the received optical signal, the optical signal which is enhanced along with the accompanying correlation in the scanning process is recorded, the optical power and the optical intensity of the optical signal are recorded, and the wavelength with the strongest electric signal intensity of the corresponding detector is used as the wavelength of the coherent-received local oscillator light. And setting a second tunable laser to work on the wavelength, wherein the second tunable laser outputs local oscillation light corresponding to the wavelength. And the receiving unit mixes the received optical signal with the local oscillator light output by the second tunable laser, and demodulates the mixed optical signal to obtain a received electric signal.
According to a specific embodiment of the present invention, the control unit includes a grating unit, adjusts a grating angle, and places the optical signal received by the receiving unit on the detector to obtain the grating angle at which the intensity of the electrical signal is strongest, where the wavelength of the optical signal corresponding to the grating angle is the wavelength of the local oscillation light. The dispersion angles of the grating to different wavelengths are different, the grating angle is rotated, light with different wavelengths falls on the detector, and the wavelength corresponding to the strongest signal light is obtained.
According to a specific embodiment of the present invention, the control unit includes an adjusting unit, configured to obtain a frequency and a phase of each optical signal output by the second tunable laser, perform difference frequency output on each optical signal and the received optical signal by using a second order mixing effect, and when the difference frequency is zero, a wavelength of a corresponding optical signal is used as a wavelength of the coherent received local oscillator light.
In an application scenario of this embodiment, a wavelength of a first tuning laser at a transmitting side of a coherent optical communication device of a local device is configured to be λ 1, a transmitting optical signal is transmitted to an opposite device through an optical fiber, and a receiving end of the coherent optical communication device of the opposite device automatically adjusts a local oscillator optical wavelength of a second tunable laser to be λ 1 according to the wavelength λ 1 of the optical signal through coherent optical detection, so as to implement processing on a received signal. Similarly, the wavelength of the first tuned laser at the transmitting end of the coherent optical communication device of the peer device is configured to be λ 2, the transmitting optical signal is transmitted to the home device through the optical fiber, and the receiving end of the coherent optical communication device of the home device automatically adjusts the local oscillator optical wavelength of the second tunable laser to be λ 2 according to the wavelength λ 2 of the optical signal through coherent optical detection, so as to implement processing on the received signal. According to the embodiment, the receiving end of the coherent optical communication device can adaptively control the wavelength of the local oscillator light by an automatic scanning detection mechanism of the received optical signal, so that the received signal is processed, and the configuration of the coherent optical communication device is more flexible.
In an embodiment of the present invention shown in fig. 2, the present invention provides a single-fiber bidirectional dual-wavelength transmission method, including:
s201, outputting an optical carrier wave with a first wavelength through a first laser, modulating a sent electric signal onto the optical carrier wave to form a sent optical signal, and transmitting the sent optical signal through an optical fiber;
s202, generating local oscillator light with a second wavelength through a second laser, mixing optical signals received through the optical fiber and the local oscillator light, and obtaining received electrical signals after demodulation, wherein the second wavelength is different from the first wavelength.
The first laser generates an optical carrier with a first wavelength, modulates a transmitted electrical signal onto the optical carrier, forms a transmitted optical signal through signal coding, polarization control and the like, and transmits the transmitted optical signal through an optical fiber. The second laser generates local oscillator light with a second wavelength, and the second wavelength is different from the first wavelength. And the received optical signal from the optical fiber and the local oscillator light are subjected to frequency mixing, the optical signal after frequency mixing is subjected to photoelectric detection, amplification and filtering and the like, and is demodulated to obtain a received electric signal, so that a required signal is obtained, and single-fiber bidirectional signal transmission with different wavelengths is realized.
According to an embodiment of the present invention, the method further comprises: the first laser is a first tunable laser, and the second laser is a second tunable laser; configuring the output wavelength of the first tunable laser to be a first wavelength, and controlling the first tunable laser to output an optical carrier wave of the first wavelength; modulating the transmitted electric signal to the optical carrier wave with the first wavelength to form a transmitted optical signal for transmission; when an optical signal is received, directly or indirectly detecting the wavelength of the received optical signal, and automatically controlling the output wavelength of the second tunable laser according to the detection result; the second tunable laser outputs local oscillator light according to the control result; and mixing the received optical signal with the local oscillator light, and demodulating to obtain a received electrical signal.
The present invention provides a communication apparatus comprising the coherent optical communication device as described above.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Claims (10)
1. A coherent optical communication device applied to a coherent optical communication system, the device comprising a transmitting device and a receiving device, wherein,
the transmission apparatus includes:
a first laser for generating an optical carrier having a first wavelength;
the transmitting unit modulates the transmitted electric signal onto the optical carrier to form a transmitted optical signal for transmission;
the receiving apparatus includes:
the second laser generates local oscillation light with a second wavelength;
and the receiving unit is used for mixing the received optical signal with the local oscillator light and obtaining a received electric signal after demodulation.
2. The coherent optical communication device of claim 1, wherein the first laser is a first tunable laser and the second laser is a second tunable laser.
3. The coherent optical communication apparatus of claim 2, wherein the transmitting apparatus further comprises a first configuration unit, wherein,
the first configuration unit is used for configuring the output wavelength of the first tunable laser to be a first wavelength;
the first tunable laser outputs an optical carrier with a first wavelength based on the configuration of the first configuration unit.
4. The coherent optical communication apparatus according to claim 3, wherein said receiving apparatus includes a second configuration unit, wherein,
the second configuration unit is used for configuring the output wavelength of the second tunable laser to be a second wavelength;
the second tunable laser outputs local oscillator light with a second wavelength based on the configuration of the second configuration unit.
5. The coherent optical communication apparatus according to claim 3, wherein the receiving apparatus includes a receiving unit and a control unit, wherein,
the receiving unit outputs a receiving indication signal to the control unit when receiving the optical signal;
the control unit is used for directly or indirectly detecting the wavelength of the received optical signal after acquiring the receiving indication signal and automatically controlling the output wavelength of the second tunable laser according to the detection result; and the second tunable laser outputs local oscillator light according to the control result of the control unit.
6. The coherent optical communication device according to claim 5, wherein the control unit includes a grating unit, configured to adjust a grating angle, and drop the optical signal received by the receiving unit onto a detector to obtain the grating angle at which the intensity of the electrical signal is strongest, where the grating angle corresponds to a wavelength of the optical signal, which is a wavelength of the local oscillator light.
7. The coherent optical communication device according to claim 5, wherein the control unit includes an adjusting unit, configured to obtain a frequency and a phase of each optical signal output by the second tunable laser, perform difference frequency output on each optical signal and the received optical signal by using a second order mixing effect, and when the difference frequency is zero, a wavelength of a corresponding optical signal is used as a wavelength of the coherent received local oscillator light.
8. A single-fiber bidirectional dual-wavelength transmission method, comprising:
outputting an optical carrier wave with a first wavelength through a first laser, modulating a sent electric signal onto the optical carrier wave to form a sent optical signal, and transmitting the sent optical signal through an optical fiber;
and generating local oscillator light with a second wavelength by a second laser, mixing the optical signal received by the optical fiber with the local oscillator light, and demodulating to obtain a received electrical signal, wherein the second wavelength is different from the first wavelength.
9. The method of single fiber bi-directional dual wavelength transmission of claim 8, wherein the method further comprises:
the first laser is a first tunable laser, and the second laser is a second tunable laser; configuring the output wavelength of the first tunable laser to be a first wavelength, and controlling the first tunable laser to output an optical carrier wave of the first wavelength;
modulating the transmitted electric signal to the optical carrier wave with the first wavelength to form a transmitted optical signal for transmission; when an optical signal is received, directly or indirectly detecting the wavelength of the received optical signal, and automatically controlling the output wavelength of the second tunable laser according to the detection result;
the second tunable laser outputs local oscillator light according to the control result;
and mixing the received optical signal with the local oscillator light, and demodulating to obtain a received electrical signal.
10. A communication device comprising the coherent optical communication apparatus according to any one of claims 1 to 7.
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| WO2023174165A1 (en) * | 2022-03-18 | 2023-09-21 | 华为技术有限公司 | Coherent receiving device, coherent transmitting device and coherent communication system |
| WO2024022029A1 (en) * | 2022-07-28 | 2024-02-01 | 华为技术有限公司 | Single-fiber bidirectional communication method, communication apparatus, and system |
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