CN116155397A - Coherent detection module and detection method - Google Patents
Coherent detection module and detection method Download PDFInfo
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- CN116155397A CN116155397A CN202310104243.9A CN202310104243A CN116155397A CN 116155397 A CN116155397 A CN 116155397A CN 202310104243 A CN202310104243 A CN 202310104243A CN 116155397 A CN116155397 A CN 116155397A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/615—Arrangements affecting the optical part of the receiver
- H04B10/6151—Arrangements affecting the optical part of the receiver comprising a polarization controller at the receiver's input stage
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6162—Compensation of polarization related effects, e.g., PMD, PDL
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Abstract
The invention discloses a coherent detection module and a detection method, which relate to the technical field of optical communication, wherein the coherent detection module comprises: a gain amplifying circuit board; the germanium-silicon optical chip is arranged on the gain amplification circuit board, and an optical mixing component and a PD array are integrated on the germanium-silicon optical chip; the germanium-silicon optical chip is used for obtaining polarized coherent signals through the optical mixing component and the PD array; the gain amplification circuit board is used for carrying out current-voltage conversion on the polarized coherent signal, and outputting the polarized coherent signal after amplification. The coherent detection module has high integration level, small optical path loss and low circuit noise.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a coherent detection module and a detection method.
Background
With the gradual commercialization of 5G technology, the demands of people on cloud computing and mobile internet are increasing, and along with that, the demands of high-speed optical communication are also increasing, and the demands on communication systems are increasing.
Compared with a direct receiving system, the coherent receiving system has the advantages of good selectivity, high sensitivity and the like, can reduce the channel rate at the same communication rate, reduce the requirement on the rate of an electronic device and improve the dispersion tolerance. The coherent optical sensing technology and application developed gradually at present comprise a coherent laser radar of free space optical sensing, and a novel coherent optical time-domain reflectometer (optical time domain reflectometer) and distributed acoustic wave sensing of optical fiber sensing, so that the coherent optical sensing technology and application have high application value and huge market demands, and are one of hot spots of technical development of products in the current industry.
However, the coherent receiver on the market at present is basically composed of an optical mixer, a PD array and a gain amplifying circuit. In the situation that the integration level is higher and the device is finer, the coherent detection module cannot meet the requirements of some application scenes.
Disclosure of Invention
In order to overcome the defects in the prior art, the first aspect of the present invention provides a coherent detection module, which has high integration level, small optical path loss and low circuit noise.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a coherent detection module, comprising:
a gain amplifying circuit board;
the germanium-silicon optical chip is arranged on the gain amplification circuit board, and an optical mixing component and a PD array are integrated on the germanium-silicon optical chip;
the germanium-silicon optical chip is used for obtaining polarized coherent signals through the optical mixing component and the PD array;
the gain amplification circuit board is used for carrying out current-voltage conversion on the polarized coherent signal, and outputting the polarized coherent signal after amplification.
In some embodiments, the optical mixing assembly comprises:
a polarization beam splitter for polarizing input signal light;
a beam splitter for splitting an input local oscillation light into two beams;
a first mixer for coherent-carrying out a beam of local oscillation light with a TE mode of the polarized signal light;
and a second mixer for coherent another Shu Benzhen light with the TM mode of the polarized signal light.
In some embodiments, the first mixer employs 90 ° optical mixing or 180 ° optical mixing and the second mixer employs 90 ° optical mixing or 180 ° optical mixing.
In some embodiments, the PD array includes a first balanced detector coupled to the first mixer and a second balanced detector coupled to the second mixer.
In some embodiments, the gain amplification circuit board is provided with a differential secondary amplification circuit, and the differential secondary amplification circuit includes:
the first circuit comprises a first-stage transimpedance circuit and a second-stage differential amplification circuit, the first-stage transimpedance circuit is used for performing current-voltage conversion on the signal output by the first balance detector, and the second-stage differential amplification circuit is used for amplifying the signal subjected to the current-voltage conversion;
the second circuit comprises a first-stage transimpedance circuit and a second-stage differential amplification circuit, the first-stage transimpedance circuit is used for performing current-voltage conversion on the signal output by the second balance detector, and the second-stage differential amplification circuit is used for amplifying the signal subjected to the current-voltage conversion.
In some embodiments, the gain amplifying circuit board is provided with a groove, and the silicon germanium optical chip is stuck in the groove and is connected with the gain amplifying circuit board by a gold wire bonding mode.
In some embodiments, the sige optical chip is coupled with an optical fiber array FA to receive signal light and local oscillation light.
The second aspect of the present invention provides a detection method of the coherent detection module, which includes the following steps:
inputting signal light and local oscillation light to be detected into a germanium-silicon optical core to obtain a polarized coherent signal;
and performing current-voltage conversion on the polarized coherent signal through a gain amplification circuit board, and outputting the polarized coherent signal after amplification.
In some embodiments, the inputting the signal light and the local oscillation light to be detected into the silicon germanium optical core to obtain the polarization coherent signal includes:
polarizing the input signal light by using a polarizing beam splitter, and dividing the input local oscillation light into two beams by using the beam splitter;
a beam of local oscillation light is coherent with a TE mode of the polarized signal light through a first mixer;
the other Shu Benzhen light is coherent with the TM mode of the polarized signal light through a second mixer;
and receiving through a first balance detector connected with the first mixer and a second balance detector connected with the second mixer to obtain a polarized coherent signal.
In some embodiments, the current-to-voltage converting, amplifying and outputting the polarized coherent signal by a gain amplifying circuit board includes:
the method comprises the steps that a first-stage transimpedance circuit in a first circuit of a differential two-stage amplifying circuit is used for carrying out current-voltage conversion on signals output by a first balance detector, and a second-stage differential amplifying circuit in the first circuit is used for amplifying the signals subjected to the current-voltage conversion;
and the signal output by the second balance detector is subjected to current-voltage conversion through a first-stage transimpedance circuit in a second circuit of the differential two-stage amplification circuit, and the signal subjected to current-voltage conversion is amplified through a second-stage differential amplification circuit in the second circuit.
Compared with the prior art, the invention has the advantages that:
according to the dry detection module, the integration level is improved through the integrated optical mixing component of the germanium-silicon optical chip and the PD array, the optical path loss is reduced, and the size of a device can be reduced by sticking the germanium-silicon optical chip to the gain amplification circuit board. In addition, the germanium-silicon optical chip reaches millimeter level, so that higher integration level can be achieved, optical path loss caused by redundant optical fibers is reduced, and the volume of the balance detector is reduced. The sensitivity of detection can be improved by utilizing the balanced detection technology, so that the coherent detection module has high sensitivity. The gain amplifying circuit adopts the idea of two-stage amplification, and can obtain higher gain and lower circuit noise through the two-stage amplification, so that the coherent detection module is low in circuit noise.
Drawings
Fig. 1 is a schematic structural diagram of a coherent detection module according to an embodiment of the present invention;
FIG. 2 is a block diagram of an optical mixing component in an embodiment of the invention;
FIG. 3 is a block diagram of a gain amplifying circuit board in an embodiment of the present invention;
FIG. 4 is a flow chart of a detection method in an embodiment of the invention;
fig. 5 is a flowchart of step S1 in fig. 4;
fig. 6 is a flowchart of step S2 in fig. 4.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The method aims at solving the problems of uneven bottom noise due to large volume, low integration level and the like of the coherent receiver at present. The embodiment of the invention adopts the germanium-silicon optical chip, utilizes an optical chip with the size of one millimeter level, simultaneously completes the work of an optical mixer and a PD array, improves the integration level of devices, and reduces the optical path loss caused by the redundancy of optical fibers.
Specifically, referring to fig. 1, an embodiment of the invention discloses a coherent detection module, which comprises a gain amplification circuit board and a germanium-silicon optical chip.
The gain amplifying circuit board is arranged on the germanium-silicon optical chip, and the optical mixing component and the PD array are integrated on the germanium-silicon optical chip. The germanium-silicon optical chip can be optically coupled by adopting an optical fiber array FA, so that the connection between the germanium-silicon optical chip and an optical signal is realized.
The germanium-silicon optical chip is used for obtaining polarized coherent signals through the optical mixing component and the PD array; the gain amplification circuit board is used for carrying out current-voltage conversion on the polarized coherent signal, and outputting the polarized coherent signal after amplification.
In some embodiments, a groove is formed on the gain amplification circuit board, the silicon germanium optical chip is adhered in the groove of the gain amplification circuit board by using silver adhesive, and meanwhile, the silicon germanium optical chip is connected with the gain amplification circuit board in a gold wire bonding mode, and the gain amplification circuit board is connected with an external circuit, so that the electrical interconnection of the chip and the external circuit is realized.
Referring to fig. 2, in a specific implementation, the optical mixing assembly includes a polarizing beamsplitter, a first mixer, and a second mixer.
The polarization beam splitter is used for polarizing the input signal light; the beam splitter is used for splitting the input local oscillation light into two beams; the first mixer is used for carrying out coherence between a beam of local oscillation light and a TE mode of the polarized signal light; the second mixer is used for making the other Shu Benzhen light coherent with the TM mode of the polarized signal light.
Preferably, the first mixer may use 90 ° optical mixing or 180 ° optical mixing, and the second mixer may also use 90 ° optical mixing or 180 ° optical mixing.
In some embodiments, the PD array employs a balanced detection technique, i.e., the PD array includes a first balanced detector coupled to the first mixer and a second balanced detector coupled to the second mixer.
After the germanium-silicon optical chip is optically coupled through the FA, local oscillation light and signal light are respectively input, and optical signals enter the germanium-silicon optical chip and are optically mixed after entering the chip. After the local oscillation light is divided into two beams, the two beams are respectively coherent with a TE mode and a TM mode of the signal light, and then the output optical signals are detected and received by two paths of high-speed low-noise balanced detectors by utilizing a balanced detection technology, so that polarized coherent signals are obtained.
After the polarization coherent signal is obtained by the germanium-silicon optical chip, the signal is transmitted to a gain amplification circuit board through a gold wire, and the gain amplification circuit mainly works: firstly, the current signal is converted into a voltage signal through a transimpedance amplifier, and secondly, the weak signal is amplified.
The gain amplifying circuit in the embodiment of the invention adopts differential signal transmission, and two paths of signals adopt a two-stage amplifying mode, so that a balanced detector with two-stage amplifying is designed, and the total gain of the detector is improved through the later-stage amplifying. The two paths of differential signals are subjected to current-voltage conversion through a first-stage transimpedance circuit, the differential signals are output, and the second-stage differential amplification circuit is connected to improve the total gain.
In specific implementation, referring to fig. 3, a differential secondary amplifying circuit is disposed on the gain amplifying circuit board, and the differential secondary amplifying circuit includes a first circuit and a second circuit.
The first circuit comprises a first-stage transimpedance circuit and a second-stage differential amplification circuit, the first-stage transimpedance circuit is used for performing current-voltage conversion on the signal output by the first balance detector (see the transimpedance amplifier in fig. 3), and the second-stage differential amplification circuit is used for amplifying the signal subjected to the current-voltage conversion (see the amplifier in fig. 3).
And the second circuit comprises a first-stage transimpedance circuit and a second-stage differential amplification circuit, the first-stage transimpedance circuit is used for performing current-voltage conversion on the signal output by the second balanced detector (participating in the transimpedance amplifier in fig. 3), and the second-stage differential amplification circuit is used for amplifying the signal subjected to the current-voltage conversion (participating in the amplifier in fig. 3).
The coherent detection module in the invention is particularly used:
firstly, connecting a coherent detection module with a power supply, and connecting signal light and local oscillation light to be detected into an FA through a flange, wherein the signal light and the local oscillation light are signal input; the optical signal is subjected to coherence and balance detection in the silicon germanium optical chip, and the RF signal in fig. 2 is output. The RF signal in fig. 2 is then input to the circuit of the gain amplification circuit board through a gold wire. Finally, the signal is subjected to current-to-voltage conversion and amplified to output an RF signal through the differential two-stage amplifying circuit in fig. 3. In fig. 3, the RF signal output from the gain amplification circuit may be coupled to an oscilloscope or other digital signal processing instrument for data analysis and processing.
In summary, in the coherent detection module of the present invention, the integration level is improved by integrating the optical mixing component and the PD array with the silicon germanium optical chip, so that the optical path loss is reduced, and the size of the device can be reduced by attaching the silicon germanium optical chip to the gain amplifying circuit board. In addition, the germanium-silicon optical chip reaches millimeter level, so that higher integration level can be achieved, optical path loss caused by redundant optical fibers is reduced, and the volume of the balance detector is reduced. The sensitivity of detection can be improved by utilizing the balanced detection technology, so that the coherent detection module has high sensitivity (more than or equal to-70 dBm). The gain amplifying circuit adopts the idea of two-stage amplification, and can obtain higher gain and lower circuit noise through the two-stage amplification, so that the coherent detection module is low in circuit noise (less than or equal to 10 mv).
Referring to fig. 4, an embodiment of the invention discloses a detection method, which comprises the following steps:
s1, inputting signal light and local oscillation light to be detected into a germanium-silicon optical core to obtain a polarization coherent signal.
Specifically, referring to fig. 5, step S1 includes:
s11, the polarization beam splitter is utilized to polarize the input signal light, and the beam splitter is utilized to split the input local oscillation light into two beams.
S12, a beam of local oscillation light is coherent with a TE mode of the polarized signal light through a first mixer.
S13, the other Shu Benzhen light is coherent with the TM mode of the polarized signal light through a second mixer.
It is worth noting that the first mixer adopts 90 ° optical mixing or 180 ° optical mixing, and the second mixer adopts 90 ° optical mixing or 180 ° optical mixing.
S14, receiving through a first balance detector connected with the first mixer and a second balance detector connected with the second mixer to obtain a polarized coherent signal.
S2, performing current-voltage conversion on the polarized coherent signal through a gain amplification circuit board, and outputting the polarized coherent signal after amplification.
Specifically, referring to fig. 6, step S2 includes:
s21, current-voltage conversion is carried out on signals output by the first balance detector through a first-stage transimpedance circuit in a first circuit of the differential two-stage amplification circuit, and the signals subjected to the current-voltage conversion are amplified through a second-stage differential amplification circuit in the first circuit.
S22, current-voltage conversion is carried out on signals output by the second balance detector through a first-stage transimpedance circuit in a second circuit of the differential two-stage amplification circuit, and the signals subjected to the current-voltage conversion are amplified through a second-stage differential amplification circuit in the second circuit.
Specifically, firstly, a coherent detection module is connected with a power supply, and signal light and local oscillation light to be detected are connected into an optical fiber array FA through a flange, which is signal input. The signal light and the local oscillation light are subjected to coherent and balanced detection in the germanium-silicon optical chip, and the RF signal in fig. 2 is output. The RF signal in fig. 2 is then input to the circuit of the gain amplification circuit board through a gold wire. Finally, the signal is subjected to current-to-voltage conversion and amplified to output an RF signal through the differential two-stage amplifying circuit in fig. 3. In fig. 3, the RF signal output from the gain amplification circuit may be coupled to an oscilloscope or other digital signal processing instrument for data analysis and processing.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A coherent detection module, comprising:
a gain amplifying circuit board;
the germanium-silicon optical chip is arranged on the gain amplification circuit board, and an optical mixing component and a PD array are integrated on the germanium-silicon optical chip;
the germanium-silicon optical chip is used for obtaining polarized coherent signals through the optical mixing component and the PD array;
the gain amplification circuit board is used for carrying out current-voltage conversion on the polarized coherent signal, and outputting the polarized coherent signal after amplification.
2. The coherent detection module of claim 1, wherein the optical mixing assembly comprises:
a polarization beam splitter for polarizing input signal light;
a beam splitter for splitting an input local oscillation light into two beams;
a first mixer for coherent-carrying out a beam of local oscillation light with a TE mode of the polarized signal light;
and a second mixer for coherent another Shu Benzhen light with the TM mode of the polarized signal light.
3. The coherent detection module of claim 2, wherein: the first mixer adopts 90-degree optical mixing or 180-degree optical mixing, and the second mixer adopts 90-degree optical mixing or 180-degree optical mixing.
4. The coherent detection module of claim 2, wherein the PD array comprises a first balanced detector coupled to the first mixer and a second balanced detector coupled to the second mixer.
5. The coherent detection module according to claim 4, wherein a differential secondary amplification circuit is provided on the gain amplification circuit board, the differential secondary amplification circuit comprising:
the first circuit comprises a first-stage transimpedance circuit and a second-stage differential amplification circuit, the first-stage transimpedance circuit is used for performing current-voltage conversion on the signal output by the first balance detector, and the second-stage differential amplification circuit is used for amplifying the signal subjected to the current-voltage conversion;
the second circuit comprises a first-stage transimpedance circuit and a second-stage differential amplification circuit, the first-stage transimpedance circuit is used for performing current-voltage conversion on the signal output by the second balance detector, and the second-stage differential amplification circuit is used for amplifying the signal subjected to the current-voltage conversion.
6. The coherent detection module of claim 1, wherein: the gain amplification circuit board is provided with a groove, and the germanium-silicon optical chip is stuck in the groove and is connected with the gain amplification circuit board in a gold wire bonding mode.
7. The coherent detection module of claim 1, wherein: the germanium-silicon optical chip is coupled with an optical fiber array FA to receive signal light and local oscillation light.
8. A method of detecting a coherent detection module according to claim 1, comprising the steps of:
inputting signal light and local oscillation light to be detected into a germanium-silicon optical core to obtain a polarized coherent signal;
and performing current-voltage conversion on the polarized coherent signal through a gain amplification circuit board, and outputting the polarized coherent signal after amplification.
9. The method of claim 8, wherein inputting the signal light and the local oscillator light to be detected into the silicon germanium optical core to obtain the polarization coherent signal comprises:
polarizing the input signal light by using a polarizing beam splitter, and dividing the input local oscillation light into two beams by using the beam splitter;
a beam of local oscillation light is coherent with a TE mode of the polarized signal light through a first mixer;
the other Shu Benzhen light is coherent with the TM mode of the polarized signal light through a second mixer;
and receiving through a first balance detector connected with the first mixer and a second balance detector connected with the second mixer to obtain a polarized coherent signal.
10. The method of claim 9, wherein: the method for converting the current and the voltage of the polarized coherent signal through the gain amplification circuit board and outputting the polarized coherent signal after amplifying comprises the following steps:
the method comprises the steps that a first-stage transimpedance circuit in a first circuit of a differential two-stage amplifying circuit is used for carrying out current-voltage conversion on signals output by a first balance detector, and a second-stage differential amplifying circuit in the first circuit is used for amplifying the signals subjected to the current-voltage conversion;
and the signal output by the second balance detector is subjected to current-voltage conversion through a first-stage transimpedance circuit in a second circuit of the differential two-stage amplification circuit, and the signal subjected to current-voltage conversion is amplified through a second-stage differential amplification circuit in the second circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310104243.9A CN116155397A (en) | 2023-02-07 | 2023-02-07 | Coherent detection module and detection method |
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| CN202310104243.9A CN116155397A (en) | 2023-02-07 | 2023-02-07 | Coherent detection module and detection method |
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