CN114866155A - Wave-division coherent receiving device, data receiving method and transmitting-receiving system - Google Patents
Wave-division coherent receiving device, data receiving method and transmitting-receiving system Download PDFInfo
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Abstract
The embodiment of the application discloses a wavelength division coherent receiving device. The device includes: the optical mixer, the filter bank and the balance detector bank. The optical mixer is used for receiving optical signals and local oscillator light to obtain I signals and Q signals. The filter bank comprises 2N four-port micro-ring filters and is used for obtaining N groups of I optical signal groups with different wavelengths and N groups of Q optical signal groups with different wavelengths according to the I signals and the Q signals. The balanced detector group includes 2N detector regions, each for deriving an electrical signal from each I optical signal group or each Q optical signal group. By adding the four-port micro-ring filter, the wavelength division coherent receiving device reduces the number of optical mixers, and improves the integration level of the wavelength division coherent receiving device.
Description
Technical Field
The present application relates to the field of optical communications, and in particular, to a wavelength division coherent receiving apparatus, a data receiving method, and a transceiving system.
Background
Coherent modulation can save optical bandwidth resources in an optical communication system, improve the optical fiber transmission efficiency, and is a way to further improve the transmission rate.
Corresponding to coherent modulation is coherent demodulation, and a coherent receiver is used for coherent demodulation of a received optical signal. The specific process is as follows: the coherent receiver demultiplexes the received optical signal into N single-wavelength optical signals through a wavelength division demultiplexer. The optical signal of each wavelength and the local oscillator light of the same wavelength are input into a 90-degree optical mixer, and the optical mixer outputs 2 paths of I (in-phase) signals and 2 paths of Q (quadrature) signals. The 2I optical signals are respectively input to a PD in a balanced photo-diode (BPD) receiver. 2 photoelectric receivers (PDs) perform photoelectric conversion on the 2I optical signals to obtain 2 electrical signals. Then, the BPD performs electrical domain signal subtraction on the 2 paths of electrical signals, inputs the subtracted electrical signals into a trans-impedance amplifier (TIA) for amplification, and then performs subsequent processing on the amplified electrical signals.
Among them, when the optical signal received by the coherent receiver is a signal light of N wavelengths, the coherent receiver requires N optical mixers. The optical mixer is large in size, which brings a challenge to improve the integration of the coherent receiver.
Disclosure of Invention
The application provides a wavelength division coherent receiving device, a data receiving method and a transceiving system, which can improve the integration level by reducing the number of optical mixers.
A first aspect of the present application provides a wavelength division coherent receiving apparatus. The apparatus may be a coherent receiver or an optical receiving module in a coherent receiver. The wave-division coherent receiving device comprises an optical mixer, a filter group and a balance detector group. The optical mixer is used for receiving optical signals with N wavelengths and local oscillator light with N wavelengths to obtain I (in-phase) signals and Q (quadrature) signals, wherein N is an integer greater than 1, the I signals comprise first I optical signals and second I optical signals, and the Q signals comprise first Q optical signals and second Q optical signals. The filter bank comprises 2N four-port micro-ring filters, the 2N four-port micro-ring filters comprise an I group filter and a Q group filter, and each group of filters comprises N four-port micro-ring filters. The four-port micro-ring filter in the group I filter is used for receiving the first I optical signal and the second I optical signal and outputting N groups of I optical signal groups with different wavelengths, and each I optical signal group comprises 2 single-wavelength optical signals with the same wavelength in the first I optical signal and the second I optical signal. The four-port micro-ring filter in the Q group of filters is used for receiving the first Q optical signal and the second Q optical signal and outputting N groups of Q optical signal groups with different wavelengths, and each Q optical signal group comprises 2 single-wavelength optical signals with the same wavelength in the first Q optical signal and the second Q optical signal. The balanced detector group comprises 2N detector areas, each detector area is used for obtaining an electric signal according to each I optical signal group or each Q optical signal group, and the 2N detector areas correspond to the 2N four-port micro-ring filters one to one.
In the wave phase coherent receiving device of the application, coherent demodulation of signal light with N wavelengths is realized by one optical mixer. Therefore, by adding the four-port micro-ring filter, the number of optical mixers can be reduced. Also, the volume of a four-port micro-ring filter is generally smaller than the size of an optical mixer. Therefore, the degree of integration of the wavelength division coherent receiving apparatus can be improved.
In an alternative form of the first aspect, the N four-port micro-ring filters in the group I filter and/or the group Q filter share 2 input ports, and micro-rings in the N four-port micro-ring filters are cascaded. The shared input port can reduce the use of beam splitter, so the cost of the wave-division coherent receiving device can be reduced.
In an optional manner of the first aspect, the N four-port micro-ring filters are single micro-ring filters, each single micro-ring filter includes a first waveguide, N micro-rings and N second waveguides, the N micro-rings are cascaded, and the N second waveguides correspond to the N micro-rings one to one. Two ends of the first waveguide are 2 input ports of the N four-port micro-ring filters, and two ends of the N second waveguides are 2N output ports of the N four-port micro-ring filters. Wherein the use of a single micro-ring filter can further improve the integration of the wavelength division coherent receiving apparatus compared to the use of other kinds of micro-ring filters.
In an alternative form of the first aspect, each detector region comprises a phase shifter and a photoelectric conversion region. The phase shifter is used for changing the phase of the first optical signal in the I optical signal group or the Q optical signal group to obtain a third optical signal, and the 2 single-wavelength optical signals in the I optical signal group or the Q optical signal group comprise the first optical signal and the second optical signal. The photoelectric conversion area is used for obtaining an electric signal according to the third optical signal and the second optical signal. And combining the third optical signal and the second optical signal can be realized subsequently by adding the phase shifter. The combined target optical signal can then be converted into an electrical signal by an opto-electrical receiver. Therefore, the number of the photoelectric receivers can be reduced. Moreover, the volume of the phase shifter is generally smaller than that of the photoelectric receiver, so that the integration level of the wavelength division coherent receiving device can be further improved.
In an alternative form of the first aspect, the photoelectric conversion region comprises a power combiner and a single-ended detector. The power beam combiner is used for combining the third optical signal and the second optical signal to obtain a target optical signal. The single-ended detector is used for obtaining an electric signal according to a target optical signal.
In an alternative form of the first aspect, the photoelectric conversion region comprises a two-port detector. The 2 input ports of the dual-port detector are used for respectively receiving the second optical signal and the third optical signal to obtain an electrical signal.
In an alternative form of the first aspect, the phase shifter is an electro-optic effect phase shifter. Wherein the electro-optic effect phase shifters are smaller in size than other types of phase shifters, such as thermo-optic effect phase shifters. Therefore, the use of the electro-optical effect phase shifter can improve the integration of the wavelength division coherent receiving apparatus.
In an alternative form of the first aspect, the apparatus further comprises a polarization beam splitter or a polarization beam splitter rotator. The polarization beam splitter or the polarization beam splitting rotator is used for receiving the dual-polarization optical signal and carrying out polarization beam splitting on the dual-polarization optical signal to obtain a single-polarization optical signal. The optical mixer is specifically configured to receive a single-polarization optical signal.
A second aspect of the present application provides a data receiving method. The method can be applied to a wavelength division coherent receiving device (receiving device for short), and specifically comprises the following steps: the receiving device receives an optical signal with N wavelengths, wherein N is an integer greater than 1. The receiving device obtains an I signal and a Q signal through an optical signal and local oscillator light with N wavelengths, wherein the I signal comprises a first I optical signal and a second I optical signal, and the Q signal comprises a first Q optical signal and a second Q optical signal. The receiving device acquires N groups of I optical signal groups with different wavelengths, wherein the I optical signal group comprises 2 single-wavelength optical signals with the same wavelength in the first I optical signal and the second I optical signal. The receiving device acquires N groups of Q optical signal groups with different wavelengths, wherein the Q optical signal group comprises 2 single-wavelength optical signals with the same wavelength in the first Q optical signal and the second Q optical signal. The receiving device obtains an electrical signal from each I optical signal group or each Q optical signal group.
In an alternative form of the second aspect, the receiving device changes a phase of the first optical signal in the I optical signal group or the Q optical signal group to obtain the third optical signal. The 2 single-wavelength signals in the I optical signal group or the Q optical signal group include a first optical signal and a second optical signal. The receiving device obtains an electrical signal according to the third optical signal and the second optical signal.
In an optional manner of the second aspect, the receiving device combines the third optical signal and the second optical signal to obtain the target optical signal. The receiving device obtains an electrical signal according to the target optical signal.
In an optional manner of the second aspect, the receiving device receives a dual-polarization optical signal, and performs polarization beam splitting on the dual-polarization optical signal to obtain a single-polarization optical signal. The receiving device obtains an I signal and a Q signal through a single-polarization optical signal and a single-polarization local oscillator light.
A third aspect of the present application provides a wavelength division coherent receiving apparatus. The wavelength division coherent receiving apparatus includes: an optical mixer, a phase shifter group and a photoelectric converter group. The optical mixer group is used for receiving optical signals and local oscillator light to obtain I signals and Q signals. The I signal includes a first I optical signal and a second I optical signal, and the Q signal includes a first Q optical signal and a second Q optical signal. The phase shifter group is used for changing the phase of the first optical signal in the I optical signal group or the Q optical signal group to obtain a third optical signal. The 2 single-wavelength optical signals in the I optical signal group or the Q optical signal group include a first optical signal and a second optical signal. The I optical signal group includes 2 single-wavelength optical signals of the same wavelength in the first I optical signal and the second I optical signal, and the Q optical signal group includes 2 single-wavelength optical signals of the same wavelength in the first Q optical signal and the second Q optical signal. The photoelectric converter group is used for obtaining an electric signal according to the third optical signal and the second optical signal.
Wherein when the I signal and the Q signal are signal lights of a single wavelength, the I optical signal group is a first I optical signal and a second I optical signal, and the Q optical signal group is a first Q optical signal and a second Q optical signal. By adding a phase shifter group between the optical mixer and the photoelectric converter group, the third optical signal and the second optical signal can be combined subsequently. The combined target optical signal is then converted into an electrical signal by a photoelectric receiver. Therefore, the number of the photoelectric receivers can be reduced. In addition, the size of the phase shifter is generally smaller than the volume of the photoelectric receiver, so that the integration level of the receiving device can be improved.
In an alternative form of the third aspect, the set of photoelectric converters comprises a power combiner and a single-ended detector. The power beam combiner is used for combining the third optical signal and the second optical signal to obtain a target optical signal. The single-ended detector is used for obtaining the electric signal according to the target optical signal.
In an alternative form of the third aspect, the photoelectric conversion region comprises a two-port detector. And 2 input ports of the dual-port detector are used for respectively receiving the second optical signal and the third optical signal to obtain the electrical signal.
In an optional manner of the third aspect, the apparatus further comprises a filter bank comprising 2N four-port micro-ring filters. The 2N four-port micro-ring filters comprise an I group of filters and a Q group of filters, and each group of filters comprises N four-port micro-ring filters. And the four-port micro-ring filter in the group I filter is used for receiving the first I optical signal and the second I optical signal and outputting N groups of I optical signal groups with different wavelengths. And the four-port micro-ring filter in the Q group of filters is used for receiving the first Q optical signal and the second Q optical signal and outputting N groups of Q optical signal groups with different wavelengths.
A fourth aspect of the present application provides a transceiving system. The system comprises: a first device and a second device. Wherein the first device is configured to transmit an optical signal to the second device. The second device comprises the wavelength division coherent receiving apparatus as described in the first aspect or any one of the alternatives of the first aspect, or comprises the wavelength division coherent receiving apparatus as described in the third aspect or any one of the alternatives of the third aspect.
A fifth aspect of the present application provides a computer storage medium having instructions stored therein, which when executed on a computer, cause the computer to perform the method according to any one of the embodiments of the second aspect or the second aspect.
A sixth aspect of the present application provides a computer program product which, when executed on a computer, causes the computer to perform the method of any one of the embodiments of the second aspect or the second aspect.
Drawings
FIG. 1 is a schematic diagram of a wavelength division coherent receiver;
FIG. 2 is a schematic diagram of a wavelength division coherent receiving device including a filter bank provided in the present application;
FIG. 3 is a schematic diagram of a group I filter provided in the present application;
FIG. 4 is a schematic diagram of a wavelength division coherent receiving apparatus including a phase shifter group provided in the present application;
fig. 5 is a schematic structural diagram of a wavelength division coherent receiving apparatus including a power combiner provided in the present application;
FIG. 6 is a schematic diagram of a structure of a wavelength division coherent receiving device including a two-port filter provided in the present application;
FIG. 7 is a schematic diagram of a wavelength division coherent receiving device provided in the present application;
FIG. 8 is a schematic diagram of a wavelength division coherent receiving device including a polarizing beam splitter as provided herein;
fig. 9 is a schematic flow chart of a data receiving method provided in the present application;
fig. 10 is a schematic structural diagram of a transceiver system provided in the present application.
Detailed Description
The application provides a wavelength division coherent receiving device, a data receiving method and a transceiving system, which can improve the integration level by reducing the number of optical mixers. It is to be understood that the use of "first," "second," etc. in the description of the embodiments of the present application is for purposes of distinguishing between the descriptions and is not intended to indicate or imply relative importance nor order to be construed.
The device, method or system provided in the application can be applied to the field of optical communication. In particular, it can be applied to coherent demodulation of wavelength division multiplexing. The wave-division coherent receiving device is used for carrying out coherent demodulation on the optical signal. Fig. 1 is a schematic diagram of a wavelength division coherent receiver. As shown in fig. 1, the wavelength division coherent receiving apparatus includes a wavelength division Demultiplexer (DEMUX) 101, a 90-degree optical mixer 102, a balanced photoelectric receiver (BPD) 103, a transimpedance amplifier 104, an analog-to-digital converter (ADC) 105, and a Digital Signal Processor (DSP) 106.
The wavelength division coherent receiving device receives an optical signal through an optical fiber, and the optical signal is signal light of multiple wavelengths. The DEMUX 101 is used to split an optical signal into a plurality of signal lights of a single wavelength (also referred to as a plurality of single carriers). The 90-degree optical mixer 102 is configured to receive a single carrier and local oscillator light and output 2I (in-phase) signals and 2Q (quadrature) signals. The I signal and the Q signal are input to different BPDs 103, respectively. Wherein each BPD 103 includes 2 photo receivers (PDs). The 2 PDs are configured to convert the 2I signals or the 2Q signals into 2 electrical signals, and the BPD 103 performs electrical domain subtraction on the 2 electrical signals to obtain one electrical signal. The electrical signal is then processed by the TIA 104, ADC 105 and DSP 106 in sequence.
When the optical signal received by the wavelength division coherent receiving device is signal light of N wavelengths, the wavelength division coherent receiving device requires N optical mixers. The optical mixer is large in size, which brings challenges to improve the integration of the wavelength division coherent receiving device.
To this end, the present application provides a wavelength division coherent receiving apparatus. The apparatus may be a coherent receiver or an optical receiving module in a coherent receiver. In particular, the device may be an integrated optical chip or an optoelectronic integrated device. Fig. 2 is a schematic diagram of a structure of a wavelength division coherent receiving apparatus including a filter bank provided in the present application. As shown in fig. 2, the wavelength division coherent receiving apparatus includes an optical mixer 201, a filter bank 202, and a balance detector bank 203.
The optical mixer 201 is also called an optical mixer or a frequency mixer. Specifically, the optical mixer 201 may be a 90-degree optical mixer or a 90-degree optical mixer. The optical mixer 201 is used to receive an optical signal from an optical fiber. The optical signal is an N-Wavelength signal light, which is also called a Wavelength Division Multiplexing (WDM) signal. The optical mixer 201 is also configured to receive local oscillator light with N wavelengths, where the local oscillator light is continuous laser light. The optical mixer 201 may receive local oscillator light transmitted by a transmitting end (wavelength division coherent transmitting apparatus) from an optical fiber; the local oscillator light may also be received from a laser, and in this case, the wavelength division coherent receiving apparatus further includes a laser. Because the wavelengths of the local oscillator light and the optical signal are similar or the same, the optical mixer 201 can obtain a coherent signal composed of the local oscillator light and the optical signal after the local oscillator light interferes with the optical signal. Moreover, since the coherent signal is composed of an optical signal, the coherent signal mixed by the optical mixer 201 is still a signal light. In an embodiment of the present application, the coherent signal includes an I signal and a Q signal. The I signal includes a first I optical signal and a second I optical signal, and the Q signal includes a first Q optical signal and a second Q optical signal. Assuming that the field strength of the optical signal is E s Local oscillation light field intensity of E lo . In one example, the first I optical signal is
The second I optical signal is
The first Q optical signal is
The second Q optical signal is
Wherein, jE lo And E lo The 2 local oscillator lights are characterized by same intensity and different phases.
The filter bank 202 includes I and Q bank filters, each bank including N four-port micro-ring filters. And the four-port micro-ring filter in the group I filter is used for receiving the first I optical signal and the second I optical signal and outputting N groups of I optical signal groups with different wavelengths. The I optical signal group includes 2 single-wavelength optical signals of the same wavelength in the first I optical signal and the second I optical signal. And the four-port micro-ring filter in the Q group of filters is used for receiving the first Q optical signal and the second Q optical signal and outputting N groups of Q optical signal groups with different wavelengths. The Q optical signal group includes 2 single-wavelength optical signals of the same wavelength in the first Q optical signal and the second Q optical signal. Since the I-bank filter and the Q-bank filter have similar functions, the following description will be made by taking the I-bank filter as an example. Fig. 3 is a schematic structural diagram of a group I filter provided in the present application. Assuming that N is equal to 4, as shown in FIG. 3, the group I filter includes a first waveguide 301 and second waveguides 302-305. Since N is equal to 4, there are 4 four-port micro-ring filters for the group I filter. When the four-port micro-ring filter is a single micro-ring filter, there are 4 micro-rings in the group I filter (each micro-ring corresponds to a four-port micro-ring filter). Specifically, a micro-ring 1 corresponding to the wavelength λ 1 is disposed between the first waveguide 301 and the second waveguide 302; a micro-ring 2 corresponding to the wavelength lambda 2 is arranged between the first waveguide 301 and the second waveguide 303; a micro-ring 3 corresponding to the wavelength lambda 3 is arranged between the first waveguide 301 and the second waveguide 304; a microring 4 corresponding to the wavelength λ 4 is disposed between the first waveguide 301 and the second waveguide 305.
The group I filters share 2 input ports and 4 microrings are cascaded. As shown in fig. 3, the first I optical signal and the second I optical signal are input to the I-bank filter from different input ports of the I-bank filter, respectively. The first I optical signal and the second I optical signal include signal lights of 4 wavelengths, which are signal lights of λ 1, λ 2, λ 3, and λ 4 wavelengths, respectively. When the first I optical signal passes through the first waveguide 301 in the vicinity of the microring 1, the signal light of the λ 1 wavelength in the first I optical signal is introduced into the microring 1 and then output from one end of the second waveguide 302. Similarly, when the first I optical signal passes through the first waveguides 301 near the microring 2, the microring 3, and the microring 4, the signal light of the corresponding wavelength in the first I optical signal is introduced into the corresponding microring and then output from one end of the corresponding second waveguide. In contrast, the second I optical signal first passes through the first waveguide 301 in the vicinity of the microring 4, and the signal light of λ 4 wavelength in the second I optical signal is introduced into the microring 4 and output from the other end of the second waveguide 305. Then, the second I optical signal passes through the microring 3, the microring 2, and the first waveguide 301 near the microring 1, and the signal light of the corresponding wavelength in the second I optical signal is introduced into the corresponding microring and then output from the other end of the corresponding second waveguide.
As can be seen from the above description, each second waveguide includes 2 ports, and each port outputs one optical signal. Thus, each second waveguide outputs a set of I optical signals. The different second waveguides output groups of I optical signals with different wavelengths, and the 4 second waveguides output 4 groups of I optical signals with different wavelengths. Similarly, the 4 second waveguides in the Q-bank filter output 4 sets of Q optical signal sets of different wavelengths.
It should be understood that the above structural schematic diagram of the group I filter in fig. 2 is only an example. In practical applications, the group I filter may have other structures.
For example, N has a value of 8. The group I filter comprises 8 cascaded micro-rings and second waveguides corresponding to the 8 micro-rings one by one.
For example, the four-port micro-ring filter in the group I filter is a multi-micro-ring filter, i.e., one wavelength corresponds to a plurality of micro-rings. For example one wavelength for 2 micro-rings. At this time, referring to fig. 2, after the signal light with the wavelength λ 1 in the first I optical signal is introduced into the micro-ring 1, the signal light with the wavelength λ 1 is introduced into another micro-ring from the micro-ring 1, and then introduced into the second waveguide from another micro-ring. Thus, signal light of one wavelength passes through two micro-rings, i.e., one wavelength corresponds to 2 micro-rings. Similarly, the first wavelength may correspond to 3 micro-rings.
For example, the four-port micro-ring filter in the group I filter is a combination of a mach-zehnder interferometer (MZI) and a micro-ring.
For example, the group I filter includes 2 splitters and N four-port micro-ring filters. One of the optical splitters is used for splitting the first I optical signal into N optical signals, and each optical signal is respectively input into one end of the corresponding four-port micro-ring filter. And the other optical splitter is used for splitting the second I optical signal into N optical signals, and each optical signal is respectively input into the other end of the corresponding four-port micro-ring filter. Thus, each four-port micro-ring filter receives 2 multi-wavelength optical signals through 2 input ports. Each four-port micro-ring filter outputs 2 single-wavelength optical signals (also called as I optical signal groups) with the same wavelength through 2 output ports. Because 1 path of single-wavelength optical signal is obtained according to the filtering of 1 path of multi-wavelength signal light, 2 paths of single-wavelength optical signal and 2 paths of multi-wavelength signal light correspond to each other one by one. And the N four-port micro-ring filters output N groups of I optical signal groups with different wavelengths. Similarly, the optical splitter may be replaced with a DEMUX.
It should be understood that since the Q bank filter is similar to the I bank filter, only the I bank filter is described above. The relevant description of the Q bank of filters may refer to the description of the I bank of filters above. The I group filter and the Q group filter may be the same or different. For example, the I-bank filter includes N single micro-loop filters and the Q-bank filter includes N double micro-loop filters.
The balanced detector bank 203 includes 2N detector regions. Each detector area is used for obtaining an electric signal according to each I optical signal group or each Q optical signal group, and 2N detector areas correspond to 2N four-port micro-ring filters one to one. In one example thereof, each detector region includes a BPD, as shown in fig. 2. The BPD converts 2 optical signals in each I optical signal group or each Q optical signal group into 2 electrical signals, and performs electrical domain subtraction to obtain one electrical signal.
The wavelength division coherent receiving apparatus may further include a TIA 204, an ADC 205, and a DSP 206 in addition to the optical mixer 201, the filter bank 202, and the balance detector bank 203 described above. The TIA 204, ADC 205, and DSP 206 are used to perform subsequent processing on the electrical signal output by the BPD. Moreover, for TIAs, ADCs, or DSPs appearing in subsequent figures, the functions thereof are similar and will not be described in detail later.
In the wavelength division coherent receiving apparatus in the embodiment of the present application, coherent demodulation of signal light of N wavelengths is realized by one optical mixer. Therefore, by adding the four-port micro-ring filter, the number of optical mixers can be reduced. Also, the size of the four-port micro-ring filter is generally smaller than the size of the optical mixer. Therefore, the degree of integration of the wavelength division coherent receiving apparatus can be improved. In practical applications, the optical mixer 201, the filter bank 202 and the balance detector bank 203 may be fabricated as an integrated optical chip by using an electro-optical device integration technology, such as silicon optical integration, lithium niobate thin film integration, indium phosphide integration, etc., so as to reduce the size, power consumption, etc. of the wavelength division coherent receiving apparatus. Therefore, by adopting the technical scheme in the application, the size of the integrated optical chip can be reduced, and the integration level of the integrated optical chip is improved. Similarly, if the optical mixer 201, the filter bank 202, the balance detector bank 203 and the TIA 204 are photoelectrically integrated by the electrooptical device integration technology to obtain an optoelectronic integrated device, the size of the optoelectronic integrated device can also be reduced.
With continued reference to fig. 1, the 2-way I signal output by the 90-degree optical mixer 102 is input to a BPD 103. One BPD includes 2 PDs. When the optical signal is signal light of N wavelengths, the wavelength division coherent receiving apparatus in fig. 1 includes 4N PDs. In the electro-optical device integration technology, the PD is not favorable for integration. Therefore, the application also provides a wavelength division coherent receiving device. Fig. 4 is a schematic diagram of a wavelength division coherent receiving apparatus including a phase shifter group provided in the present application. As shown in fig. 4, the apparatus includes: an optical mixer 401, a phase shifter bank 402 and an opto-electrical converter bank 403.
The optical mixer 401 is configured to receive the local oscillator light and the single carrier, and obtain 2 paths of I signals and 2 paths of Q signals. The single carrier is signal light of a single wavelength. Specifically, the single carrier may be obtained by demultiplexing signal light of multiple wavelengths through DEMUX. The optical mixer 401 may receive local oscillator light transmitted by a transmitting end (wavelength division coherent transmitting apparatus) from an optical fiber; local oscillator light may also be received from a laser. In the embodiment of the present application, the 2-channel I signal includes a first I optical signal and a second I optical signal, and the first I optical signal and the second I optical signal are 2 single-wavelength optical signals with the same wavelength. The 2-channel Q signal includes a first Q optical signal and a second Q optical signal, which are 2 single-wavelength optical signals of the same wavelength. The first I optical signal and the second I optical signal are a set of I optical signals; the first and second Q optical signals are a set of Q optical signals. It should be understood that reference may be made to the foregoing description of the optical mixer 201 of fig. 2 for a description of the optical mixer 401.
The phase shifter 402 is used to change the phase of the first optical signal in the I optical signal group or the Q optical signal group to obtain the third optical signal. When the phase shifter is used to change the phase of the first optical signal in the set of I optical signals, the first optical signal may be the first I optical signal or the second I optical signal; when the phase shifter is used to change the phase of the first optical signal in the Q optical signal group, the first optical signal may be the first Q optical signal or the second Q optical signal. In the I optical signal group or the Q optical signal group, the other optical signal is also referred to as a second optical signal in addition to the first optical signal. The second optical signal and the third optical signal are 180 degrees out of phase. Therefore, when the phases of the first optical signal and the second optical signal are the same, the phase shifter is a 180-degree phase shifter. In fig. 4, one optical mixer needs to correspond to 2 phase shifters. Therefore, when a single carrier is obtained by demultiplexing signal light of N wavelengths, the wavelength division coherent receiving apparatus requires 2N phase shifters.
The photoelectric converter group 403 includes 2 photoelectric conversion regions. Each photoelectric conversion region is used for obtaining an electric signal according to the third optical signal and the second optical signal. Specifically, the photoelectric conversion region combines the second optical signal and the third optical signal to obtain a target optical signal. Then, the photoelectric conversion region converts the target optical signal into an electrical signal.
Two structures of the photoelectric conversion region provided in the present application are explained below.
First, it is described that the photoelectric conversion region includes one power combiner and one PD. Fig. 5 is a schematic structural diagram of a wavelength division coherent receiving apparatus including a power combiner provided in the present application. As shown in fig. 5, one photoelectric conversion region includes one power combiner 4031 and one PD 4032. The power combiner 4031 is configured to combine the second optical signal and the third optical signal to output a target optical signal. And, since the phase difference of the second optical signal and the third optical signal is 180 degrees. The power beam combining performed by the power beam combiner 4031 may also be understood as performing optical domain addition on the second optical signal and the third optical signal by the power beam combiner 4031, or performing optical domain subtraction on the second optical signal and the first optical signal by the power beam combiner 4031. The PD 4032 is used to receive the target optical signal and convert the target optical signal into an electrical signal. When a single carrier is obtained by demultiplexing signal light of N wavelengths, the wavelength division coherent receiving apparatus requires 2N PDs.
Next, it is described that the photoelectric conversion region includes a two-port PD. Fig. 6 is a schematic diagram of a structure of a wavelength division coherent receiving device including a two-port filter provided in the present application. As shown in fig. 6, one photoelectric conversion region includes one dual-port PD 4033. The dual port PD4033 includes 2 input ports and one output port. The second optical signal and the third optical signal are input from 2 different input ports, respectively. The dual-port PD4033 combines the second optical signal and the third optical signal to obtain a target optical signal. Then, the dual-port PD4033 converts the target optical signal into an electrical signal. When a single carrier is obtained by demultiplexing signal light of N wavelengths, the wavelength division coherent receiving apparatus requires 2N dual ports PD.
The structure of the 2 kinds of photoelectric conversion regions is described above. It should be understood that in practical applications, the wavelength division coherent receiving apparatus may perform any combination of the structures of the photoelectric conversion regions in 2. For example, when the wavelength-division coherent receiving apparatus needs to demodulate signal light of N wavelengths, the wavelength-coherent receiving apparatus includes N optical mixers. For the photoelectric conversion regions corresponding to the N/2 optical mixers, each photoelectric conversion region comprises a power combiner and a PD. For the photoelectric conversion regions corresponding to the other N/2 optical mixers, each photoelectric conversion region comprises a dual-port PD. At this time, the wavelength coherent reception device includes N PDs and N dual port PDs.
As can be seen from the above description, the wavelength division coherent receiving apparatus in the embodiment of the present application requires 2N PDs or 2N dual-port PDs for demodulating signal light of N wavelengths. Whereas in the aforementioned scheme of fig. 1, 4N PDs are required for the coherent receiving device. Therefore, the number of PDs can be reduced, the size of a wavelength division coherent receiving device, an integrated optical chip or a photoelectric integrated device is reduced, and the integration level of the wavelength division coherent receiving device, the integrated optical chip or the photoelectric integrated device is improved. It is understood that the phase shifter is more advantageous for optoelectronic integration than the PD. Therefore, even if the solution in the present application would increase the number of phase shifters, the effect thereof would be beneficial.
The above describes two kinds of wavelength division coherent receiving apparatuses in the present application. One of the devices reduces the number of optical mixers by adding a four-port micro-ring filter. Another way is to reduce the number of PDs by adding phase shifters. The application also provides a wavelength division coherent receiving device which comprises the four-port micro-ring filter and the phase shifter. This is described below.
Fig. 7 is a schematic structural diagram of a wavelength division coherent receiving device provided in the present application. As shown in fig. 7, the apparatus includes an optical mixer 701, a filter bank 702, and a balance detector bank 703.
As for the optical mixer 701 and the filter bank 702, please refer to the related description of the optical mixer 201 and the filter bank 202 in fig. 2.
The balanced detector group 703 includes a phase shifter group and a photoelectric converter group. The phase shifter group comprises 2N phase shifters. Each phase shifter is used for changing the phase of the first optical signal in the I optical signal group or the Q optical signal group to obtain a third optical signal. The photoelectric converter group comprises 2N photoelectric conversion regions, and the 2N photoelectric conversion regions correspond to the 2N phase shifters one by one. Each photoelectric conversion region is used for receiving a third optical signal and a second optical signal. The second optical signal is an optical signal except the first optical signal in the I optical signal group or the Q optical signal group. The photoelectric conversion area is used for combining the third optical signal and the second optical signal to obtain a target optical signal. The photoelectric conversion region then converts the target optical signal into an electrical signal. Specifically, in fig. 7, each photoelectric conversion region includes one power combiner and one PD. The power beam combiner is used for performing power beam combination on the second optical signal and the third optical signal and outputting a target optical signal. The PD is configured to receive a target optical signal and convert the target optical signal into an electrical signal. With regard to the description of the balanced detector group 703, reference may be made to the aforementioned description of the phase shifter group and the photoelectric converter group in fig. 4, 5, or 6.
It should be understood that the wavelength division coherent receiving apparatus in fig. 7 is only one example provided in the present application. In practical applications, other structures are also possible. For example, some or all of the power combiners and PDs in the balanced detector bank 703 shown in fig. 7 may be replaced with dual port PDs. Also for example, one or more of the phase shifters, power combiners, and PDs of the balanced detector group 703 shown in fig. 7 may be replaced with BPDs.
By adding the four-port micro-ring filter and the phase shifter, the wavelength division coherent receiving device in the application not only reduces the number of optical mixers, but also reduces the number of PDs. Therefore, the size of the wavelength division coherent receiving apparatus can be further reduced, and the integration level thereof can be improved.
In practical applications, polarization multiplexing may be used to increase the communication bandwidth. In the polarization multiplexing technique, the optical signal received by the wavelength division coherent receiving device is a dual-polarized optical signal. In this regard, the present application provides another wavelength division coherent receiving apparatus for demodulating a dual-polarized optical signal. Fig. 8 is a schematic structural diagram of a wavelength division coherent receiving device including a polarization beam splitter provided in the present application. As shown in fig. 8, the apparatus includes a polarization beam splitter 801, a light mixer 802, a light mixer 803, and 2 optoelectronic devices 704. For convenience of description, the phase shifter group 702, the balanced detector group 703, the TIA, the ADC, and the DSP in fig. 7 are referred to as an opto-electronic device 704.
The polarization beam splitter 801 is configured to receive a dual-polarized optical signal from an optical fiber and split the dual-polarized optical signal into an X-polarized optical signal and a Y-polarized optical signal. The optical mixer 802 is configured to receive an X-polarized optical signal and an X-polarized local oscillator light, and mix the X-polarized optical signal and the X-polarized local oscillator light to obtain a coherent signal. The specific process can refer to the related description of the optical mixer 201 in fig. 2. Similarly, the optical mixer 803 is configured to receive the optical signal with Y polarization and the local oscillator light with Y polarization, and mix the optical signal with Y polarization and the local oscillator light with Y polarization to obtain a coherent signal. The wavelength division coherent receiving device may further include another polarization beam splitter for splitting the dual-polarized local oscillation light into X-polarized local oscillation light and Y-polarized local oscillation light. The optoelectronic device 704 is used for performing correlation processing on the coherent signal output by the optical mixer 802 or the optical mixer 803. The specific process flow may refer to the related description of the optoelectronic device 704 in fig. 7.
It should be understood that the polarization beam splitter 801 may be replaced with a polarization beam splitter rotator. The polarization beam splitting rotator is used for receiving the dual-polarization optical signal from the optical fiber, splitting the dual-polarization optical signal into an X-polarization optical signal and a Y-polarization optical signal, and rotating the Y-polarization optical signal into the X-polarization optical signal. In practical applications, different processing devices, such as filters, phase shifters, etc., need to be designed for the optical signals with X-polarization or Y-polarization. Therefore, the use of the polarization beam splitter rotator can simplify the complexity of design.
The above describes the wavelength division coherent receiving apparatus in the present application, and the following describes the data receiving method in the present application. Fig. 9 is a flowchart illustrating a data receiving method provided in the present application. As shown in fig. 9, the data receiving method includes the following steps.
In step 901, the wavelength division coherent receiving apparatus receives an optical signal of N wavelengths.
In step 902, the wavelength division coherent receiving apparatus obtains an I signal and a Q signal from the optical signal and the local oscillator light with N wavelengths.
The I signal includes a first I optical signal and a second I optical signal, and the Q signal includes a first Q optical signal and a second Q optical signal. If the wavelength division coherent receiving device receives the dual-polarization optical signal, the wavelength division coherent receiving device performs polarization beam splitting on the dual-polarization optical signal to obtain a single-polarization optical signal. The wavelength division coherent receiving device is specifically used for obtaining an I signal and a Q signal according to a single-polarization optical signal and local oscillator light. The I and Q signals are also called coherent signals.
In step 903, the wdm coherent receiver apparatus obtains N groups of I optical signal groups from the I signal, and obtains N groups of Q optical signal groups from the Q signal. Wherein, the wavelength of each group of I optical signal groups is different, and the wavelength of each group of Q optical signal groups is different. The I optical signal group comprises 2 single-wavelength optical signals with the same wavelength in the first I optical signal and the second I optical signal; the Q optical signal group includes 2 single-wavelength optical signals of the same wavelength in the first Q optical signal and the second Q optical signal.
In step 904, the wdm coherent receiver apparatus obtains an electrical signal from each I optical signal group or each Q optical signal group. Specifically, the wavelength division coherent receiving device changes the phase of the first optical signal in the I optical signal group or the Q optical signal group to obtain the third optical signal. The 2 single-wavelength signals in the I optical signal group or the Q optical signal group include a first optical signal and a second optical signal. Then, the wavelength division coherent receiving device combines the third optical signal and the second optical signal to obtain the target optical signal. Then, an electrical signal is obtained according to the target optical signal.
It should be understood that the data receiving method in the present application is executed mainly by a wavelength division coherent receiving apparatus, which may be the wavelength division coherent receiving apparatus in fig. 2, and fig. 4 to 8 described above. Therefore, with regard to the description of the correlation of the data reception method, reference may be made to the description of the correlation of the wavelength division coherent reception apparatus described above. For example, the wavelength division coherent receiving apparatus may receive, from the optical fiber, the local oscillator light transmitted by the transmitting end (wavelength division coherent transmitting apparatus); local oscillator light may also be received from a laser. Or, the definition of the first I optical signal is defined.
The following describes a transmission/reception system in the present application. Fig. 10 is a schematic structural diagram of a transceiver system provided in the present application. As shown in fig. 10, the transceiving system includes a first device and a second device. The first device is used for sending an optical signal to the second device; the second device may be the wavelength division coherent receiving apparatus described in the aforementioned fig. 2, or fig. 4 to 8. The second device is used for obtaining an I signal and a Q signal according to the optical signal and the local oscillator light.
In other embodiments, the first device comprises a laser 1001. The continuous laser beam emitted from the laser 1001 is split into 2 continuous laser beams by the beam splitter 1002. Wherein, the 1 path of continuous laser passes through the modulator 1003 to obtain a modulated optical signal. The optical signal is transmitted to the second device through the optical fiber via the circulator 1004. The optical signal passes through a circulator 1010 in the second device and enters a coherent receiving unit 1012. The local oscillation light is another continuous laser beam output from the optical splitter 1002. The continuous laser beam passes through a circulator 1005 and is transmitted to a second device through an optical fiber. The continuous laser passes through a circulator 1011 in the second device and enters a wavelength coherent receiving apparatus 1012 as a local oscillation light of the wavelength coherent receiving apparatus 1012. The wavelength division coherent receiving apparatus 1012 obtains an I signal and a Q signal from the local oscillation light and the optical signal. The wavelength division coherent receiving device 1012 may be the wavelength division coherent receiving device in the embodiments corresponding to fig. 2 or fig. 4 to 8. Therefore, with regard to the subsequent processing flow of the I signal and the Q signal, reference may be made to the description of fig. 2 or fig. 4 to 8 described above.
In other embodiments, the second device may also implement similar functionality of the first device. Specifically, the second device includes a laser 1007. The continuous laser light emitted from the laser 1007 is split into 2 continuous laser lights by the beam splitter 1008. Wherein, the 1 path of continuous laser passes through the modulator 1009 to obtain the modulated optical signal. The optical signal is transmitted to the first device through the optical fiber via the circulator 1010. The optical signal passes through a circulator 1004 in the first apparatus and enters a coherent receiving device 1006. The local oscillation light is another continuous laser light output from the optical splitter 1008. The continuous laser beam passes through the circulator 1011 and is transmitted to the first device through the optical fiber. The continuous laser enters the wavelength division coherent receiving device 1006 after passing through the circulator 1005 in the first device, and is used as the local oscillator light of the wavelength division coherent receiving device 1006. The wavelength division coherent receiving device 1006 obtains an I signal and a Q signal from the local oscillation light and the optical signal.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application.
Claims (13)
1. A wavelength division coherent receiving apparatus, comprising: an optical mixer, a filter bank and a balance detector bank, wherein:
the optical mixer is used for receiving optical signals with N wavelengths and local oscillator light with N wavelengths to obtain I signals and Q signals, wherein N is an integer greater than 1, the I signals comprise first I optical signals and second I optical signals, and the Q signals comprise first Q optical signals and second Q optical signals;
the filter bank comprises 2N four-port micro-ring filters, the 2N four-port micro-ring filters comprise an I group filter and a Q group filter, and each group of filters comprises N four-port micro-ring filters;
the four-port micro-ring filter in the group I filter is used for receiving the first I optical signal and the second I optical signal and outputting N groups of I optical signal groups with different wavelengths, wherein each group I optical signal group comprises 2 single-wavelength optical signals with the same wavelength in the first I optical signal and the second I optical signal;
the four-port micro-ring filter in the Q group of filters is used for receiving the first Q optical signal and the second Q optical signal and outputting N groups of Q optical signal groups with different wavelengths, wherein each Q optical signal group comprises 2 single-wavelength optical signals with the same wavelength in the first Q optical signal and the second Q optical signal;
the balanced detector group comprises 2N detector areas, each detector area is used for obtaining an electric signal according to each I optical signal group or each Q optical signal group, and the 2N detector areas are in one-to-one correspondence with the 2N four-port micro-ring filters.
2. The apparatus of claim 1, wherein the N four-port micro-ring filters of the I-bank filter and/or the Q-bank filter share 2 input ports, and wherein micro-rings of the N four-port micro-ring filters are cascaded.
3. The apparatus of claim 2, wherein the N four-port microring filters are single microring filters comprising a first waveguide, N microrings, and N second waveguides, the N microrings being cascaded, the N second waveguides and the N microrings being in one-to-one correspondence;
two ends of the first waveguide are 2 input ports of the N four-port micro-ring filters, and two ends of the N second waveguides are 2N output ports of the N four-port micro-ring filters.
4. A device according to any one of claims 1 to 3, wherein each detector region comprises a phase shifter and a photoelectric conversion region, wherein:
the phase shifter is configured to change a phase of a first optical signal in the I optical signal group or the Q optical signal group to obtain a third optical signal, where 2 single-wavelength optical signals in the I optical signal group or the Q optical signal group include the first optical signal and a second optical signal;
the photoelectric conversion region is used for obtaining the electric signal according to the third optical signal and the second optical signal.
5. The apparatus of claim 4, wherein the photoelectric conversion region comprises a power combiner and a single-ended detector;
the power beam combiner is used for combining the third optical signal and the second optical signal to obtain a target optical signal;
the single-ended detector is used for obtaining the electric signal according to the target optical signal.
6. The apparatus of claim 4, wherein said photoelectric conversion region comprises a two-port detector;
and 2 input ports of the dual-port detector are used for respectively receiving the second optical signal and the third optical signal to obtain the electrical signal.
7. A device according to claim 5 or 6, wherein the phase shifters are electro-optical effect phase shifters.
8. The apparatus according to any one of claims 1 to 7, further comprising a polarization beam splitter or polarization beam splitter rotator;
the polarization beam splitter or the polarization beam splitting rotator is used for receiving a dual-polarization optical signal and performing polarization beam splitting on the dual-polarization optical signal to obtain a single-polarization optical signal;
the optical mixer is specifically configured to receive the single-polarization optical signal.
9. A data receiving method is applied to a wavelength division coherent receiving device and is characterized by comprising the following steps:
receiving optical signals with N wavelengths, wherein N is an integer greater than 1;
obtaining an I signal and a Q signal through the optical signal and local oscillator light with N wavelengths, wherein the I signal comprises a first I optical signal and a second I optical signal, and the Q signal comprises a first Q optical signal and a second Q optical signal;
acquiring N groups of I optical signal groups with different wavelengths, wherein the I optical signal group comprises 2 single-wavelength optical signals with the same wavelength in the first I optical signal and the second I optical signal;
acquiring N groups of Q optical signal groups with different wavelengths, wherein each Q optical signal group comprises 2 single-wavelength optical signals with the same wavelength in the first Q optical signal and the second Q optical signal;
and obtaining an electric signal according to each I optical signal group or each Q optical signal group.
10. The method of claim 9, wherein;
said deriving an electrical signal from each of said I optical signal groups or each of said Q optical signal groups comprises:
changing the phase of a first optical signal in the I optical signal group or the Q optical signal group to obtain a third optical signal, wherein 2 single-wavelength signals in the I optical signal group or the Q optical signal group comprise the first optical signal and a second optical signal;
and obtaining the electric signal according to the third optical signal and the second optical signal.
11. The method of claim 10, wherein deriving the electrical signal from the third optical signal and the second optical signal comprises:
combining the third optical signal and the second optical signal to obtain a target optical signal;
and obtaining the electric signal according to the target optical signal.
12. The method of any of claims 9-11, wherein receiving the optical signal comprises:
receiving a dual polarized optical signal;
the method further comprises the following steps:
carrying out polarization beam splitting on the dual-polarization optical signal to obtain a single-polarization optical signal;
the obtaining of the I signal and the Q signal by the optical signal and the local oscillator light of the N wavelength includes:
and obtaining the I signal and the Q signal through the single-polarization optical signal and the single-polarization local oscillator light.
13. A transceiver system, comprising:
a first device and a second device;
wherein the first device is configured to transmit an optical signal to the second device;
the second device comprises a wavelength division coherent receiving apparatus as claimed in any one of the preceding claims 1 to 8.
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