Optical communication method, transmitter, receiver and optical communication device

Abstract

An optical communication method, a transmitter, a receiver and an optical communication device, the optical communication method comprising: acquiring a to-be-transmitted sequence, dividing the to-be-transmitted sequence into a digital direct transmission group and an analog transmission group according to bit weight, the bit weight of the digital direct transmission group being greater than the bit weight of the analog transmission group; performing digital-to-analog conversion on a to-be-sent sequence of the analog transmission group to obtain a first analog electric signal, and performing electro-optical modulation on the first analog electric signal to obtain a first analog optical signal; performing electro-optical conversion on the to-be-sent sequence of the digital direct transmission group to obtain a digital optical signal; and multiplexing the first analog optical signal and the digital optical signal into one optical signal for transmission.

Description

Optical communication methods, transmitters, receivers and optical communication devices

[0001] This disclosure relates to, but is not limited to, the field of optical fiber communication technology, and particularly to an optical communication method, transmitter, receiver, and optical communication device.

[0002] Fiber optic communication links are essential physical links in modern communication networks, such as high-capacity fixed broadband and cellular fronthaul systems, which require extremely high communication speeds. Existing fiber optic transmission systems sometimes use analog optical signals for transmission, such as in analog fiber optic repeaters. While analog signal transmission effectively reduces bandwidth requirements, this approach suffers from limited signal accuracy and susceptibility to noise. Fiber optic communication systems that use only digital signals effectively overcome channel noise and offer stable transmission. However, the higher the communication speed of these systems, the higher the power consumption of their communication modules and the greater the heat generated. This is especially true in wavelength division multiplexing (WDM) systems, where the laser's output signal wavelength is highly sensitive to heat, requiring dedicated temperature control modules. This process is technically demanding and costly.

[0003] Furthermore, as existing optical communication systems upgrade their speeds, the requirements for high-speed interfaces of digital drive units are becoming increasingly stringent. Upgrading fiber optic links requires replacing digital drive units with higher-specification chips, resulting in higher costs and making it difficult to achieve low-cost upgrades based on existing systems.

[0004]

[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0006] This disclosure provides an optical communication method, including:

[0007] Obtain the sequence to be sent, and divide the sequence into a digital direct transmission group and an analog transmission group according to the bit weight, wherein the bit weight of the digital direct transmission group is greater than the bit weight of the analog transmission group;

[0008] The sequence to be transmitted in the analog transmission group is converted from digital to analog to obtain a first analog electrical signal, and the first analog electrical signal is electro-optically modulated to obtain a first analog optical signal; the sequence to be transmitted in the digital direct transmission group is converted from digital to optical to obtain a digital optical signal.

[0009] The first analog optical signal and the digital optical signal are multiplexed into a single optical signal for transmission.

[0010] This disclosure also provides an optical communication transmitter, including: a transmit packet control unit, a hybrid electro-optic conversion unit, and a wavelength division multiplexing unit, wherein:

[0011] The transmit packet control unit is configured to acquire a sequence to be transmitted and divide the sequence to be transmitted into a digital direct transmission group and an analog transmission group according to the bit weight, wherein the bit weight of the digital direct transmission group is greater than the bit weight of the analog transmission group.

[0012] The hybrid electro-optic conversion unit is configured to perform digital-to-analog conversion on the sequence to be transmitted in the analog transmission group to obtain a first analog electrical signal, and to perform electro-optic modulation on the first analog electrical signal to obtain a first analog optical signal; and to perform electro-optic conversion on the sequence to be transmitted in the digital direct transmission group to obtain a digital optical signal.

[0013] The wavelength division multiplexing unit is configured to multiplex the first analog optical signal and the digital optical signal into a single optical signal for transmission.

[0014] This disclosure provides an optical communication method, including:

[0015] Receive mixed digital-analog optical signals and decompose the received mixed digital-analog optical signals into digital direct-transmission optical signals and analog optical signals;

[0016] The digital direct-transmission optical signal is converted into a first received digital sequence; the analog optical signal is photoelectrically converted to obtain a first received analog electrical signal, and the first received analog electrical signal is analog-to-digital converted to obtain a second received digital sequence, wherein the bit weight of the first received digital sequence is greater than the bit weight of the second received digital sequence.

[0017] The first received digital sequence and the second received digital sequence are combined into a received digital sequence.

[0018] This disclosure also provides an optical communication receiver, including: a wavelength division multiplexing unit, a hybrid photoelectric conversion unit, and a receiver combination control unit, wherein:

[0019] The wave decomposition and multiplexing unit is configured to receive a mixed digital-analog optical signal and decompose the received mixed digital-analog optical signal into a digital direct-transmission optical signal and an analog optical signal.

[0020] The hybrid photoelectric conversion unit is configured to convert the digital direct-transmission optical signal into a first received digital sequence; perform photoelectric conversion on the analog optical signal to obtain a first received analog electrical signal; and perform analog-to-digital conversion on the first received analog electrical signal to obtain a second received digital sequence, wherein the bit weight of the first received digital sequence is greater than the bit weight of the second received digital sequence.

[0021] The receiving combination control unit is configured to combine the first received digital sequence and the second received digital sequence into a received digital sequence.

[0022] This disclosure also provides an optical communication device, including an optical communication transmitter as described in any embodiment of this disclosure and an optical communication receiver as described in any embodiment of this disclosure.

[0023] The optical communication method, transmitter, receiver, and optical communication device of this disclosure divide the sequence to be transmitted into a digital direct transmission group and an analog transmission group according to the bit weight. The two groups are transmitted in the same communication channel by multiplexing digital optical signals and analog optical signals into one optical signal. This can significantly reduce the communication rate requirements of digital optical modules, thereby reducing the difficulty of device implementation and system upgrade costs, and increasing the transmittable signal rate.

[0024] Other features and advantages of this disclosure will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the disclosure. Other advantages of this disclosure may be realized and obtained by means of the methods described in the description and the accompanying drawings.

[0025] The accompanying drawings are used to provide an understanding of the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure.

[0026] Figure 1 is a flowchart illustrating an optical communication method for a transmitter provided in an exemplary embodiment of this disclosure;

[0027] Figure 2 is a schematic diagram of a hybrid digital-analog transmission model provided by an exemplary embodiment of the present disclosure;

[0028] Figure 3 is a schematic diagram of a transmitter sequence processing procedure provided by an exemplary embodiment of the present disclosure;

[0029] Figure 4 is a schematic diagram of a mixed-signal spectrum provided by an exemplary embodiment of the present disclosure;

[0030] Figure 5 is a flowchart illustrating an optical communication method for a receiver provided in an exemplary embodiment of this disclosure;

[0031] Figure 6 is a schematic diagram of a receiving end signal processing procedure provided by an exemplary embodiment of the present disclosure;

[0032] Figure 7 is a schematic diagram showing the relationship between the system transmission rate and the allocation ratio α of the digital direct transmission group provided in an exemplary embodiment of this disclosure;

[0033] Figure 8 is a schematic diagram of the error vector magnitude (EVM) performance when transmitting communication waveform data according to several exemplary embodiments of this disclosure;

[0034] Figure 9A is a schematic diagram of the structure of an optical communication transmitter provided in an exemplary embodiment of this disclosure;

[0035] Figure 9B is a schematic diagram of the structure of an optical communication receiver provided in an exemplary embodiment of the present disclosure;

[0036] Figure 9C is a schematic diagram of the structure of an optical communication system provided by an exemplary embodiment of the present disclosure;

[0037] Figure 10 is a schematic diagram of another optical communication system provided by an exemplary embodiment of the present disclosure;

[0038] Figure 11 is a schematic diagram of the communication process of the transmitter end of an optical communication system provided by an exemplary embodiment of the present disclosure;

[0039] Figure 12 is a schematic diagram of the communication process of a receiver end of an optical communication system provided by an exemplary embodiment of the present disclosure;

[0040] Figure 13 is a schematic diagram of another optical communication system provided by an exemplary embodiment of the present disclosure;

[0041] Figures 14A and 14B are schematic diagrams of two other optical communication systems provided by exemplary embodiments of this disclosure.

[0042] This disclosure describes several embodiments, but these descriptions are exemplary and not limiting, and it will be apparent to those skilled in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with, or may replace, any feature or element of any other embodiment.

[0043] This disclosure includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features, and elements disclosed in this disclosure may also be combined with any conventional features or elements to form a unique inventive scheme as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive schemes to form another unique inventive scheme as defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this disclosure may be implemented individually or in any suitable combination. Therefore, the embodiments are not limited except by the limitations imposed by the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

[0044] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that the method or process does not depend on the specific order of steps described herein. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation of the claims. Moreover, the claims relating to the method and / or process should not be limited to the steps performed in the order written, and those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments disclosed herein.

[0045] As shown in Figure 1, this disclosure provides an optical communication method, including:

[0046] Step 101: Obtain the sequence to be sent, and divide the sequence to be sent into a digital direct transmission group and an analog transmission group according to the bit weight. The bit weight of the digital direct transmission group is greater than the bit weight of the analog transmission group.

[0047] Step 102: Perform digital-to-analog conversion on the sequence to be transmitted in the analog transmission group to obtain a first analog electrical signal, and perform electro-optic modulation on the first analog electrical signal to obtain a first analog optical signal; perform electro-optic conversion on the sequence to be transmitted in the digital direct transmission group to obtain a digital optical signal;

[0048] Step 103: Multiplex the first analog optical signal and the digital optical signal into a single optical signal for transmission.

[0049] The optical communication method of this disclosure divides the sequence to be transmitted into a digital direct transmission group and an analog transmission group according to the bit weight. The two groups are transmitted in the same communication channel by multiplexing digital optical signals and analog optical signals into one optical signal. This can significantly reduce the communication rate requirements of digital optical modules, thereby reducing the difficulty of device implementation and system upgrade costs, and increasing the transmittable signal rate.

[0050] In some exemplary embodiments, the method further includes, prior to: setting transmitter initialization parameters, wherein the transmitter initialization parameters include at least one of the following: the original bit rate R of the sequence to be transmitted. b0 The number of symbols K in a single frame, the number of bits L in a single symbol, and the proportion α of the digital direct transmission group to the sequence to be transmitted.

[0051] As shown in Figure 2, this embodiment of the present disclosure provides a mathematical model for mixed-signal transmission of an input digital bit sequence signal to be transmitted. The input signal is an input digital bit sequence signal s (i.e., the sequence to be transmitted s), where n is the bit slot number and the bit rate is R. b0 A symbol is composed of several bits. Let the length of a single symbol be L bits and the period of a single symbol be T. S A signal frame is composed of several symbols, and the length of a single signal frame is K symbols.

[0052] In some practical applications, for a single symbol containing L bits, each bit has different importance. The Most Significant Bit (MSB) is defined as the bit with the highest weight within a single symbol, having the greatest impact on the numerical meaning of the symbol. The Least Significant Bit (LSB) is defined as the bit with the lowest weight within a single symbol, having the least impact on the numerical meaning of the symbol, but it is usually not negligible. In practical applications, there are two scenarios: first, the MSB bit of a symbol arrives at the input before its LSB bit; second, the LSB bit of a symbol arrives at the input before its MSB bit. In this embodiment, it is required that the bit signal with the lower weight be converted into an analog signal for transmission, and the closer it is to the LSB, the earlier its position within the frame, and the lower the amplitude weight of its corresponding analog signal during digital-to-analog conversion. In practical applications, the time flipping of MSB and LSB can be achieved through software control, which will not be elaborated here. The following description assumes the signal format of LSB being transmitted first.

[0053] A single symbol is represented as {b0, b1, ..., b} L-1}, and the bit sequence of the m-th frame is represented as

[0054] The input digital bit sequence signal b(n) is divided into a digital direct transmission group and an analog transmission group according to the input order. Let the allocation ratio of the digital direct transmission group be α, and the allocation ratio of the analog transmission group be (1-α), 0≤α≤1, where α=0 indicates that the system is a simple analog transmission system and α=1 indicates that the system is a simple digital transmission system.

[0055] In this embodiment of the disclosure, a digital direct transmission group refers to a portion of the digital sequence s that occupies a proportion α in the input digital bit sequence b(n). D The analog transmission group refers to the portion of the input digital bit sequence b(n) that occupies a proportion of 1-α, which is directly serially sent to the system's digital transmission link. Ab After being converted into an analog signal, it is sent to the system's analog transmission link.

[0056] The analog group signal to be converted within a single frame forms a new bit sequence s with (1-α)LK bits. Ab ,

[0057] In some exemplary embodiments, before performing digital-to-analog conversion on the sequence to be transmitted of the analog transmission group, the method further includes:

[0058] Based on the number of symbols within a frame, the sequence to be transmitted in the analog transmission group is interleaved so that the same level bits of multiple symbols within a frame are in adjacent transmission positions.

[0059] In some applications, the arrangement of the analog group signals to be converted can be interleaved based on the number of symbols within the frame. One method is as follows:

[0060] The process begins by transmitting the least significant bit of each consecutive symbol. After the least significant bit of a symbol within a frame has been transmitted, the next higher-level bits are transmitted sequentially, and so on, until a frame is completed. This interleaving process ensures that the analog signal noise affecting the same level of bits across different symbols is more similar, avoiding the problem of excessively large differences in the overall signal-to-noise ratio between adjacent symbols leading to excessive demodulation errors at the receiver. Furthermore, other variations of this interleaving method can be implemented, which will not be elaborated upon here.

[0061] The analog signal to be converted s Ab After digital-to-analog conversion, an analog signal s is obtained. A , represented as

[0062] A single frame of digital direct transmission group signals forms a new symbol s with αLK bits. D The bit rate is Rb1, satisfying Rb1=αRb0, and this digital direct transmission signal s D It is represented as follows,

[0063] The length L of a single symbol can be defined by the user as any positive integer greater than 0. If the user does not define it, a default of one byte, i.e., 8 bits, is used for a single symbol, or L = 8. This default convention conforms to the general rules in the fields of digital signal processing and computer science. The bit sequence within a single symbol increases sequentially from 0 to L-1, or it can increase sequentially from 1 to L. This only depends on the usage habits of the specific scenario and does not affect the actual signal processing.

[0064] This disclosure is geared towards low-cost systems with limited high-speed interfaces; therefore, it employs a digital direct transmission signal s obtained based on the above processing. D and analog signal s A Parallel transmission is performed on carrier signals of different wavelengths. Without loss of generality, let the digital direct transmission signal s be loaded. D Let the carrier signal wavelength be λ1, and let the analog transmission signal s be applied. A If the carrier signal wavelength is λ2, then the parallel transmission signal s can be obtained. t (t):

[0065] s t (t)∝s D *exp(j2πct / λ1)+s A *exp(j2πct / λ2) (Formula 6)

[0066] Where c is the speed of light, and the ∝ symbol indicates that it is proportional to, that is, the signal on the left and the signal on the right have a linear proportional relationship.

[0067] The signal processing diagram corresponding to the above process is shown in Figure 3.

[0068] After obtaining the synthesized transmission signal s t After (t), consider the linear channel transmission process, i.e., the signal s received by the receiver. r (t) is proportional to the transmitted signal s t (t), denoted as s r (t)∝s t (t).

[0069] One example can be represented by the spectral characteristics shown in Figure 4, where the digital signal is the part with a wider bandwidth and the analog signal is the part with a narrower bandwidth. It can be seen from the spectrum that the two signals are located at different frequency positions, and the greater the distance between them, the more beneficial it is for the receiver to separate the digital signal from the analog signal.

[0070] As shown in Figure 5, this disclosure also provides an optical communication method, including:

[0071] Step 501: Receive the mixed digital-analog optical signal and decompose the received mixed digital-analog optical signal into a digital direct-transmission optical signal and an analog optical signal;

[0072] Step 502: Convert the digital direct-transmission optical signal into a first received digital sequence; perform photoelectric conversion on the analog optical signal to obtain a first received analog electrical signal, and perform analog-to-digital conversion on the first received analog electrical signal to obtain a second received digital sequence, wherein the bit weight of the first received digital sequence is greater than the bit weight of the second received digital sequence.

[0073] Step 503: Combine the first received digital sequence and the second received digital sequence into a received digital sequence.

[0074] The receiving end can filter the received signal s r The digital and analog parts in (t) are ideally separated, thus obtaining

[0075] s rD (t)∝s D *exp(j2πct / λ1) (Formula 7)

[0076] s rA (t)∝s A *exp(j2πct / λ2) (Formula 8)

[0077] For the receiving digital signal section s rD The processing of (t) is relatively simple; it can be done directly by receiving digital data, obtaining the received digital sequence, and representing it according to the frame format.

[0078] For the receiving analog signal section s rA (t) First, quantize s. rA (t) The maximum amplitude is A rmax The number of quantization bits is (1-α)LK, corresponding to the transmitted signal, thus obtaining the received quantization sequence.

[0079] If the transmitter uses the aforementioned interleaving process, then the received quantization sequence is:

[0080] By recombine the received digital sequence and the received quantization sequence, the received sequence can be obtained.

[0081] The signal processing diagram corresponding to the above process is shown in Figure 6.

[0082] This completes the mixed digital-analog transmission process of the system input digital bit sequence signal s.

[0083] The impact of the above process on the system transmission rate is shown in Figure 7. According to Figure 7, under the condition of varying signal grouping ratio, using the above-mentioned hybrid digital-analog transmission method, the transmission rate of the digital signal and the bandwidth of the analog signal are always no higher than the equivalent system digital bit sequence signal transmission rate, achieving the beneficial effect of reducing the requirements for the system's high-speed transmission interface. Specifically, the digital signal rate gradually increases in a stepwise manner with the increase of the grouping ratio until it matches the original signal bit rate. The switching rate of the analog signal amplitude is independent of the grouping ratio, only related to the symbol length L and the number of symbols K in a single frame, which is 1 / LK. It should be noted that in practical applications, the selection of K is limited by the accuracy of the digital-to-analog converter and the analog-to-digital converter chip, and cannot be increased indefinitely.

[0084] The EVM performance of the above process when transmitting communication waveform data is shown in Figure 8. According to Figure 8, the performance of the above-mentioned hybrid digital-analog transmission method, under noisy channel conditions, can produce performance advantages over rate-limited digital fiber optic transmission systems, meeting the application requirements of communication systems.

[0085] As shown in Figure 9A, this embodiment of the present disclosure also provides an optical communication transmitter, including: a transmit packet control unit, a hybrid electro-optical conversion unit, and a wavelength division multiplexing unit, wherein:

[0086] The transmit packet control unit is configured to acquire the sequence to be transmitted and divide the sequence into a digital direct transmission group and an analog transmission group according to the bit weight, wherein the bit weight of the digital direct transmission group is greater than the bit weight of the analog transmission group.

[0087] The hybrid electro-optic conversion unit is configured to perform digital-to-analog conversion on the sequence to be transmitted in the analog transmission group to obtain a first analog electrical signal, and to perform electro-optic modulation on the first analog electrical signal to obtain a first analog optical signal; and to perform electro-optic conversion on the sequence to be transmitted in the digital direct transmission group to obtain a digital optical signal.

[0088] The wavelength division multiplexing unit is configured to multiplex a first analog optical signal and a digital optical signal into a single optical signal for transmission.

[0089] In some exemplary embodiments, the hybrid electro-optic conversion unit includes: a digital direct transmission control unit, a transmitting digital optical module unit, an analog signal transmission control unit, a digital-to-analog conversion unit, and an analog electro-optic conversion unit;

[0090] The digital direct transmission control unit is configured to encapsulate the sequence to be transmitted of the digital direct transmission group according to the optical fiber transmission protocol, and output the encapsulated data frame signal to the transmitting end digital optical module unit.

[0091] The transmitting digital optical module unit is configured to convert the encapsulated data frame signal into a digital optical signal;

[0092] The analog signal transmission control unit is configured to arrange the sequence to be transmitted of the analog transmission group in a preset order and output the arranged sequence to be transmitted to the digital-to-analog conversion unit;

[0093] The digital-to-analog conversion unit is configured to perform digital-to-analog conversion on the received sequence to be transmitted to obtain a first analog electrical signal;

[0094] The analog electro-optic conversion unit is configured to perform electro-optic conversion on the first analog electrical signal to obtain the first analog optical signal.

[0095] In this embodiment of the disclosure, the analog signal transmission control unit can arrange the input sequence according to the aforementioned formulas 2 to 4. In practical applications, the analog signal transmission control unit can also perform error correction coding and other operations on the sequence to be transmitted of the analog transmission group (error correction coding is not limited to the sequence to be transmitted of the analog transmission group; the sequence to be transmitted of the digital direct transmission group is error corrected and coded by the digital direct transmission control unit).

[0096] In some exemplary embodiments, the analog electro-optic conversion unit includes: an analog electrical signal amplification unit, an analog electrical signal biasing unit, and an electro-optic modulation unit;

[0097] The analog electrical signal amplification unit is configured to amplify the first analog electrical signal to obtain an amplified first analog electrical signal.

[0098] The analog electrical signal biasing unit is configured to perform DC biasing processing on the amplified first analog electrical signal;

[0099] The electro-optic modulation unit is configured to perform electro-optic conversion on the biased first analog electrical signal.

[0100] As shown in Figure 9B, this embodiment of the present disclosure also provides an optical communication receiver, including: a wavelength division multiplexing unit, a hybrid photoelectric conversion unit, and a receiver combination control unit, wherein:

[0101] The wavelength decomposition and multiplexing unit is configured to receive mixed digital-analog optical signals and decompose the received mixed digital-analog optical signals into digital direct-transmission optical signals and analog optical signals.

[0102] The hybrid photoelectric conversion unit is configured to convert a digital direct-transmission optical signal into a first received digital sequence; perform photoelectric conversion on an analog optical signal to obtain a first received analog electrical signal; and perform analog-to-digital conversion on the first received analog electrical signal to obtain a second received digital sequence, wherein the bit weight of the first received digital sequence is greater than the bit weight of the second received digital sequence.

[0103] The receiving combination control unit is configured to combine a first received digital sequence and a second received digital sequence into a received digital sequence.

[0104] In some exemplary embodiments, the hybrid photoelectric conversion unit includes: a receiving digital optical module unit, a digital direct receiving control unit, an analog photoelectric conversion unit, an analog-to-digital conversion unit, and an analog signal receiving control unit;

[0105] The receiving digital optical module unit is configured to convert the received digital direct-transmission optical signal into a first digital electrical signal and output it to the digital direct-receive control unit;

[0106] The digital direct receiver control unit is configured to perform time control and buffer control on the received first digital electrical signal;

[0107] The analog photoelectric conversion unit is configured to perform photoelectric conversion on the analog optical signal to obtain a first received analog electrical signal, and output it to the analog-to-digital conversion unit;

[0108] The analog-to-digital conversion unit is configured to perform analog-to-digital conversion on the first received analog electrical signal to obtain a second digital electrical signal, and output it to the analog signal receiving and control unit;

[0109] The analog signal receiving and control unit is configured to arrange the received second digital electrical signals in a preset order.

[0110] In this embodiment, the analog signal receiving control unit arranges the received second digital electrical signal in a preset order. This preset order can refer to the arrangement order described in Formulas 2 to 4 above. If the system undergoes interleaving or scrambling processing, the analog signal receiving control unit needs to perform corresponding inverse processing to obtain the arrangement order described in Formulas 2 to 4 above. The first and second digital electrical signals are synthesized according to the reverse process of a preset segmentation criterion to obtain the final received digital bit sequence.

[0111] In some exemplary embodiments, the analog photoelectric conversion unit includes: a photodetector and a photodetector driving circuit;

[0112] A photodetector is configured to perform photoelectric conversion on the received analog optical signal under the drive control of a photodetector driving circuit to obtain a first received analog electrical signal.

[0113] As shown in Figure 9C, this disclosure also provides an optical communication system based on a hybrid analog-digital transmission method. This optical communication system employs an intensity modulation direct detection photoelectric transmission structure. The system includes an optical communication transmitter, an optical fiber channel, and an optical communication receiver.

[0114] As shown in Figure 9A, the optical communication transmitter includes: a data input interface, a transmit packet control unit, a digital direct transmission control unit, a transmitting digital optical module unit, an analog signal transmission control unit, a digital-to-analog conversion unit, an analog-to-optical conversion unit, a wavelength division multiplexing unit, and a transmitting fiber optic channel interface.

[0115] The data input interface is used to receive user data. In this embodiment, the received user data is a digital bit sequence signal. The data input interface can be implemented in various ways, including network interfaces and various custom digital interfaces.

[0116] The transmit packet control unit is the hardware and software algorithm for implementing the aforementioned function of dividing the input digital bit sequence signal into digital direct transmission groups and analog transmission groups. It receives the user digital bit sequence signal provided by the data input interface, performs digital bit sequence signal grouping operation according to the user-defined grouping rules, and has two output ports. Output port one outputs the digital direct transmission part bit sequence signal, and output port two outputs the analog transmission part bit sequence signal to be converted.

[0117] In digital fiber optic communication, in addition to transmitting the original digital bit sequence signal, it is also necessary to ensure that the transmitted signal does not contain long 0s or long 1s, thereby guaranteeing the recovery of the signal clock at the receiving end. This involves scrambling / descrambling, 8B10B encoding, 64B66B encoding techniques, etc. The digital direct transmission control unit realizes the transmission of the digital direct transmission group bit sequence signal in the digital driver chip to the high-speed fiber optic interface. It receives the digital direct transmission part bit sequence signal output from the output port of the transmit group control unit, encapsulates the signal according to a specific fiber optic transmission protocol, obtains the data frame signal for transmission to the digital fiber optic channel, and outputs the signal to the input interface of the transmitting digital optical module unit.

[0118] The transmitting digital optical module unit realizes the function of converting digital electrical signals into digital optical signals, and is a standard module commonly used in optical fiber communication systems.

[0119] The analog signal transmission control unit implements the analog transmission signal to be converted. It receives the analog transmission signal to be converted output from output port two of the transmit group control unit and arranges the input sequence according to the frame structure described in the previous embodiment. In this embodiment, the analog signal transmission control unit can arrange the input sequence according to the aforementioned formulas 2 to 4. In practical applications, the analog signal transmission control unit can also perform error correction coding and other operations on the sequence to be transmitted of the analog transmission group (error correction coding is not limited to the sequence to be transmitted of the analog transmission group; the sequence to be transmitted of the digital direct transmission group is error-corrected and coded by the digital direct transmission control unit).

[0120] In some embodiments, the digital-to-analog converter (DAC) unit is driven by serial data, in which case the analog signal transmission control unit transmits the serial sequence to the DAC unit in chronological order. In other embodiments, the DAC unit is driven by parallel data, in which case the analog signal transmission control unit converts the serial input sequence into a parallel output sequence and then outputs it to the DAC unit in chronological order.

[0121] The digital-to-analog converter is a common device in the field of electronics. Its control method is to input a digital signal with the same period in each sampling clock cycle, and based on the conversion relationship between the chip's digital signal and analog signal, to obtain the corresponding analog electrical signal output according to the reference voltage value.

[0122] The analog electro-optic conversion unit converts the analog electrical signal output by the digital-to-analog conversion unit into an analog optical signal. Specifically, it includes an analog electrical signal amplification unit, an analog electrical signal biasing unit, and an electro-optic modulation unit. The electro-optic modulation unit has two structures: direct modulation and external modulation, which can be selected according to hardware cost and performance requirements.

[0123] A wavelength division multiplexing (WDM) unit couples optical signals of different wavelengths, enabling them to be transmitted within the same optical fiber channel. In this embodiment, a WDM unit capable of simultaneously transmitting two wavelength optical signals is used. Input port 1 corresponds to wavelength λ1 as described in the previous embodiment, input port 2 corresponds to wavelength λ2 as described in the previous embodiment, and the signal at the output port corresponds to signal s as described in the previous embodiment. t (t). In some embodiments, more wavelength division multiplexing units capable of transmitting more wavelength optical signals simultaneously can be used to transmit more independent signals.

[0124] The transmitting fiber channel interface enables connection to the fiber channel connector.

[0125] An optical fiber channel includes a transmitter fiber optic connector, an optical fiber, and a receiver fiber optic connector. The optical fiber and corresponding connectors are selected based on the wavelength, transmission distance, and other requirements of the actual application; specific details can be found in the relevant national and industry standards for optical fibers.

[0126] As shown in Figure 9B, the optical communication receiver includes a receiving-end optical fiber channel interface, a wavelength division multiplexing unit, a receiving-end digital optical module unit, a digital direct receiving control unit, an analog-to-electrical conversion unit, an analog-to-digital conversion unit, an analog signal receiving control unit, a receiving combination control unit, and a data output interface.

[0127] The receiving end fiber channel interface enables connection to the fiber channel connector.

[0128] The wavelength division multiplexing unit receives the signal transmitted from the receiving end fiber optic channel interface and converts the received signal s r In (t), the digital and analog signals are separated, where output port one corresponds to the wavelength λ1 described in the previous embodiment, and the output signal corresponds to the s described in the previous embodiment. rD (t), output port 2 corresponds to the wavelength λ2 described in the previous embodiment, and the output signal corresponds to the s described in the previous embodiment. rA (t).

[0129] The receiving digital optical module unit is connected to the output port of the wavelet demultiplexing unit to convert the received digital optical signal into a digital electrical signal and output it to the digital direct receiver control unit.

[0130] The input terminal of the digital direct receiving control unit is connected to the output terminal of the receiving digital optical module unit, and is used for time control and buffering control of the data signal output by the receiving digital optical module unit. In some embodiments, the digital direct receiving control unit needs to control the receiving digital optical module unit. The output terminal of the digital direct receiving control unit is connected to the input port of the receiving combination control unit. In some embodiments, the digital direct receiving control unit, the receiving combination control unit, and the analog signal receiving control unit are software kernels defined within a single hardware chip, and can be connected to other parts through software definition. In other embodiments, the digital direct receiving control unit can be a separate hardware chip, which needs to be connected to the input port of the receiving combination control unit through an external circuit.

[0131] The analog photoelectric conversion unit converts received analog optical signals into analog electrical signals. Its structure includes a photodetector and a photodetector driving circuit. The photosensitive surface of the photodetector is connected to the output port of the wave demultiplexing unit. Driven by the photodetector driving circuit, it converts the analog optical signal into an analog electrical signal. The analog electrical signal output from this part is connected to the input of the analog-to-digital converter (ADC) unit.

[0132] The analog-to-digital converter (ADC) is a common component in the electronics field. Its input signal is a continuous analog electrical signal output from the analog-to-digital converter. The control method involves sampling the input analog signal within each sampling clock cycle and quantizing it into a digital signal with a period consistent with the sampling clock based on a reference voltage value. Based on the chip's analog-to-digital signal conversion relationship, the corresponding digital electrical signal is output. The output of this part is connected to the input terminal of the analog signal receiving and control unit.

[0133] The input terminal of the analog signal receiving control unit is connected to the output terminal of the analog-to-digital converter (ADC). In some embodiments, the output signal of the ADC is a serial digital sequence, requiring a serial hardware connection for the corresponding analog signal receiving control unit. In other embodiments, the output signal of the ADC is a parallel digital sequence, requiring a parallel hardware connection for the corresponding analog signal receiving control unit. In some embodiments, the analog signal receiving control unit, the receiving combination control unit, and the digital direct receiving control unit are software kernels defined within a single hardware chip, allowing for software-defined connections to other components. In other embodiments, the analog signal receiving control unit is a separate hardware chip, requiring connection to the input port of the receiving combination control unit via external circuitry.

[0134] The receiving combination control unit has two input terminals. Input port one is connected to the output terminal of the digital direct receiving control unit, and input port two is connected to the output terminal of the analog signal receiving control unit. In some embodiments, the receiving combination control unit, the digital direct receiving control unit, and the analog signal receiving control unit are software kernels defined within a single hardware chip, allowing for software-defined connections to other components. In other embodiments, the receiving combination control unit is a separate hardware chip, requiring external circuitry for connection to other units. The output port of the receiving combination control unit is connected to a data output interface.

[0135] The data output interface enables the output of data processed by the system. Depending on actual needs, it can be a network interface or other external data transmission interface.

[0136] This disclosure also provides an optical communication device, including an optical communication transmitter as described in any embodiment of this disclosure and an optical communication receiver as described in any embodiment of this disclosure.

[0137] In some embodiments, as shown in FIG10, an optical communication transmitter and an optical communication receiver can be integrated into one device and connected to another device that also integrates an optical communication transmitter and an optical communication receiver to perform full-duplex communication.

[0138] This disclosure also provides an optical communication method based on the hybrid digital-analog transmission method, including an optical communication process at the system transmitter and an optical communication process at the system receiver.

[0139] As shown in Figure 11, the optical communication process at the system transmitter includes:

[0140] Step 1: In the initial stage of system operation, the transmit packet control unit responds to the user's control request and sets the transmitter initialization parameters. The transmitter initialization parameters include, but are not limited to, the system's original bit rate R. b0L is the number of bits in a single symbol of the system, α is the allocation ratio of digital direct transmission groups in a mixed digital-analog transmission link, and K is the number of symbols in a single frame of the system.

[0141] Step two: In response to the user's control request, input data (i.e., the sequence to be sent s) through the data input interface and transmit it to the transmission packet control unit.

[0142] Step 3: The transmit packet control unit processes the signals transmitted from the data input interface into packets. The packetization rules are controlled by the packetization parameters obtained in Step 1, decomposing the signals into a digital direct transmission sequence, corresponding to the aforementioned digital direct transmission group s. D , and the analog transmission portion sequence to be converted, corresponding to the aforementioned analog transmission group s Ab .

[0143] Step four: The digital direct transmission control unit delays the digital direct transmission sequence within each symbol by an agreed time and sends it to the input port of the transmitting digital optical module unit. The optical wavelength corresponding to this module is the wavelength λ1 described in the aforementioned embodiment.

[0144] Step 5: Based on the selected number of intra-frame symbols K, in some embodiments employing a parallel-driven DAC chip (i.e., a digital-to-analog converter), the analog signal transmission control unit sequentially combines the sequence of analog transmission parts to be converted within each symbol into a parallel signal, which is then clock-controlled and input to the parallel input port of the digital-to-analog converter. In some embodiments employing a serial-driven DAC chip, the analog signal transmission control unit sequentially inputs the sequence of analog transmission parts to be converted within each symbol to the serial input port of the digital-to-analog converter, corresponding to the s mentioned in the aforementioned embodiments. Ab .

[0145] Step 6, utilize the generated s Ab The signal drives the digital-to-analog converter to generate a first analog electrical signal, corresponding to the signal s described in the preceding embodiments. A .

[0146] Step 7: Using the generated first analog electrical signal, drive the analog electro-optic conversion unit to convert the first analog electrical signal into a first analog optical signal with a wavelength corresponding to λ2 as described in the foregoing embodiment.

[0147] Step 8: Combine the first analog optical signal output from the analog electro-optical conversion unit and the digital optical signal output from the transmitting digital optical module unit into a single optical signal s using a wavelength division multiplexing unit. t (t) transmits signals through an optical fiber channel.

[0148] As shown in Figure 12, the optical communication process at the system receiver includes:

[0149] Step 1: In the initial stage of system operation, set the receiver initialization parameters, including the system's original bit rate R corresponding to the transmitter initialization parameters. b0 L is the number of bits in a single symbol of the system, α is the allocation ratio of digital direct transmission group and analog transmission group in the digital-analog hybrid transmission link, and K is the number of symbols in a single frame of the system.

[0150] Step two: Receive the mixed-signal optical signal transmitted through the fiber optic channel, corresponding to the s described in the preceding embodiments. r (t).

[0151] Step 3: Using a wavelength division multiplexing (WDM) demultiplexing unit matched with the transmitting end's WDM unit, the received mixed digital-analog optical signal is decomposed into a digital direct-transmission optical signal s carried by a wavelength λ1 optical signal. rD (t) and the analog optical signal s carried by the wavelength λ2 optical signal. rA (t).

[0152] Step four: Use the receiving digital optical module unit that matches the transmitting digital optical module unit to receive the digital direct-transmission optical signal carried by the wavelength λ1 optical signal and convert it into the first received digital sequence.

[0153] Step 5: Use an analog photoelectric conversion unit that matches the analog electro-optical conversion unit of the transmitting end to receive the analog optical signal carried by the wavelength λ2 optical signal and convert it into the first received analog electrical signal.

[0154] Step six: Use an analog-to-digital converter to convert the first received analog electrical signal into a second received digital sequence, corresponding to s as described in Example 1. rAb .

[0155] Step seven: Using the receiving combination control unit, the first received digital sequence obtained from the conversion of the digital direct-transmission optical signal and the second received digital sequence obtained from the conversion of the analog optical signal are recombined into a received digital sequence according to the agreed rules, corresponding to the above embodiment. .

[0156] In some embodiments, the received digital sequence can be transmitted via a data output interface to other corresponding systems capable of further applying the data.

[0157] In some exemplary embodiments, the optical communication method at the transmitting end further includes:

[0158] Differential calculations are performed on the sequence to be transmitted in the analog transmission group to obtain the differential sequence to be transmitted in the analog transmission group;

[0159] The differential sequence to be transmitted in the analog transmission group is converted from digital to analog to obtain a second analog electrical signal, and the second analog electrical signal is electro-optically modulated to obtain a second analog optical signal.

[0160] Multiplexing a first analog optical signal and a digital optical signal into a single optical signal for transmission includes: multiplexing a first analog optical signal, a second analog optical signal, and a digital optical signal into a single optical signal for transmission.

[0161] Accordingly, the analog optical signal received by the receiving end includes a first analog optical signal and a second analog optical signal. Before performing photoelectric conversion on the analog optical signal, the optical communication method of the receiving end further includes: performing differential synthesis processing on the first analog optical signal and the second analog optical signal, and using the obtained differential synthesized signal as an analog optical signal for photoelectric conversion.

[0162] As shown in Figure 13, in some embodiments, dual-wavelength optical differential analog signal transmission can be used instead of single-wavelength optical analog signal transmission to improve the noise immunity of analog optical signals in hybrid digital-analog transmission optical communication systems.

[0163] At this time, the transmitting end includes two analog electrical signal input ports and a dual-wavelength electro-optic modulation unit, and the receiving end includes two analog optical signal input ports, a dual-wavelength photodetector unit and a differential synthesis unit (not shown in the figure). The differential synthesis unit can be built with discrete circuit components, or it can be processed by software by the analog signal receiving and control unit after the two signals are processed by analog-to-digital conversion (ADC).

[0164] Accordingly, the wavelength division multiplexing (WDM) unit at the transmitting end needs to be replaced with a three-wavelength WDM unit. This WDM unit has three input ports: input port one is the same as in the previous embodiment, corresponding to wavelength λ1 optical signal; input port two is also the same as in the previous embodiment, corresponding to wavelength λ2 optical signal; and input port three differs from the previous embodiment, corresponding to wavelength λ3 optical signal. This WDM unit has one output port, which outputs a mixed signal of the three wavelengths, which is transmitted to the receiving end via an optical fiber channel.

[0165] Accordingly, the wavelength demultiplexing unit at the receiving end needs to be replaced with a three-wavelength demultiplexing unit. This demultiplexing unit has one input terminal, which receives a mixed signal of three wavelengths transmitted via optical fiber. The demultiplexing unit has three output ports: output port one is the same as in the previous embodiment, corresponding to wavelength λ1; output port two is the same as in the previous embodiment, corresponding to wavelength λ2; and output port three is different from the previous embodiment, corresponding to wavelength λ3.

[0166] The signal transmitted by the dual-wavelength differential analog signal transmission unit is s Aand its corresponding differential signal s A Define a constant C such that the differential signal s A =Cs A Keep the value positive.

[0167] The receiver detected signal s respectively A and s A Then, differential synthesis is performed to synthesize the signal.

[0168] By transmitting differential signals and performing differential synthesis, the expected signal power is increased by 6dB, while the noise power is only increased by 3dB, which is equivalent to a 3dB improvement in the signal-to-noise ratio. It should be noted that this value will be affected by the actual operating environment of the system.

[0169] In some embodiments, the optical communication device further includes a channel switching unit disposed within the optical communication transmitter and / or optical communication receiver, configured to switch between analog optical transmission channels and digital optical transmission channels.

[0170] In some embodiments, the transmitting / receiving digital optical module unit and the analog optoelectronic / electro-optical conversion unit in the system can be integrated into a hybrid module. As shown in Figure 14A, the transmitting end includes a digital optical transmitting unit, an analog optical transmitting unit, and a channel switching unit, while the receiving end includes a digital optical receiving unit, an analog optical receiving unit, and a channel switching unit. Further, as shown in Figure 14B, the digital optical transmitting unit and the digital optical receiving unit can be integrated into a single transceiver module: a digital optical transceiver unit, and the analog optical transmitting unit and the analog optical receiving unit can be integrated into a single transceiver module: an analog optical transceiver unit. That is, each device includes a digital optical transceiver unit, an analog optical transceiver unit, and a channel switching unit. This device has a compact structure and offers compatibility and controllability. The design allows the analog optical transmission channel to be switched to a traditional digital optical transmission channel via the channel switching unit, ensuring compatibility with existing systems and not affecting the use of existing communication systems.

[0171] The optical communication method, transmitter, receiver, and optical communication device of this disclosure employ a flexibly configurable hybrid digital-analog transmission technology. This technology divides the complete digital sequence signal into two groups, one for direct transmission and the other converted into an analog optical signal. This allocates the total system rate requirement to the corresponding digital and analog channels, thereby reducing the average rate requirement of the system's digital channels. Based on system transmission performance criteria, the grouping ratio of the digital direct transmission group and the analog conversion group is adjusted, reducing the rate requirements of the optical fiber communication system on the digital drive unit and optical module, lowering system costs, and improving the system's smooth upgrade capability. The embodiments of this disclosure are universal. In high-capacity broadband communication systems and cellular fronthaul systems, it can expand the application range of limited-rate optical fiber interfaces while reducing the system's physical transmission rate, further increasing the number of controllable channels in the fronthaul system. Under the condition of constant rate, it can improve data accuracy, increase the quantization signal-to-noise ratio, and improve the baseband signal spectral flatness, meeting the application requirements of high-capacity fixed broadband and cellular fronthaul systems.

[0172] It will be understood by those skilled in the art that all or some of the steps, systems, or apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0173] It should be noted that the above embodiments or implementation methods are merely exemplary and not restrictive. Therefore, this disclosure is not limited to the content specifically shown and described herein. Various modifications, substitutions, or omissions can be made to the form and details of the implementations without departing from the scope of this disclosure.

Claims

An optical communication method, comprising: A sequence to be transmitted is acquired, and the sequence is divided into a digital direct transmission group and an analog transmission group according to the bit weight, wherein the bit weight of the digital direct transmission group is greater than the bit weight of the analog transmission group; the sequence to be transmitted in the analog transmission group is converted from digital to analog to obtain a first analog electrical signal, and the first analog electrical signal is electro-optically modulated to obtain a first analog optical signal; the sequence to be transmitted in the digital direct transmission group is converted from digital to optical to obtain a digital optical signal; the first analog optical signal and the digital optical signal are multiplexed into a single optical signal for transmission. According to the method of claim 1, wherein, Before performing digital-to-analog conversion on the sequence to be transmitted of the analog transmission group, the method further includes: interleaving the sequence to be transmitted of the analog transmission group according to the number of symbols in the frame, so that the same level bits of multiple symbols in a frame are in adjacent transmission positions. According to the method of claim 1, wherein, Before performing digital-to-analog conversion on the sequence to be transmitted of the analog transmission group, the method further includes: converting the serial sequence to be transmitted into a parallel sequence to be transmitted according to the transmission order and the parallel transmission bit width of the digital-to-analog conversion. According to claim 1, the method further comprises, prior to the method: The transmitter initialization parameters are set, wherein the transmitter initialization parameters include at least one of the following: the original bit rate R of the sequence to be transmitted. b0 The number of symbols K in a single frame, the number of bits L in a single symbol, and the proportion α of the digital direct transmission group to the sequence to be sent. According to the method of claim 1, wherein, The method further includes: performing differential calculation on the sequence to be transmitted of the analog transmission group to obtain the differential sequence to be transmitted of the analog transmission group; performing digital-to-analog conversion on the differential sequence to be transmitted of the analog transmission group to obtain a second analog electrical signal, and performing electro-optic modulation on the second analog electrical signal to obtain a second analog optical signal; the step of multiplexing the first analog optical signal and the digital optical signal into one optical signal for transmission includes: multiplexing the first analog optical signal, the second analog optical signal and the digital optical signal into one optical signal for transmission. An optical communication transmitter, comprising: The system comprises a transmit packet control unit, a hybrid electro-optical conversion unit, and a wavelength division multiplexing (WDM) unit, wherein: the transmit packet control unit is configured to acquire a sequence to be transmitted, and divide the sequence into a digital direct transmission group and an analog transmission group according to bit weight, wherein the bit weight of the digital direct transmission group is greater than the bit weight of the analog transmission group; the hybrid electro-optical conversion unit is configured to perform digital-to-analog conversion on the sequence to be transmitted in the analog transmission group to obtain a first analog electrical signal, and perform electro-optical modulation on the first analog electrical signal to obtain a first analog optical signal; and perform electro-optic conversion on the sequence to be transmitted in the digital direct transmission group to obtain a digital optical signal; the wavelength division multiplexing (WDM) unit is configured to multiplex the first analog optical signal and the digital optical signal into a single optical signal for transmission. The optical communication transmitter according to claim 6, wherein, The hybrid electro-optic conversion unit includes: a digital direct transmission control unit, a transmitting digital optical module unit, an analog signal transmission control unit, a digital-to-analog conversion unit, and an analog electro-optic conversion unit. The digital direct transmission control unit is configured to encapsulate the sequence to be transmitted from the digital direct transmission group according to an optical fiber transmission protocol, and output the encapsulated data frame signal to the transmitting digital optical module unit. The transmitting digital optical module unit is configured to convert the encapsulated data frame signal into a digital optical signal. The analog signal transmission control unit is configured to arrange the sequence to be transmitted from the analog transmission group in a preset order, and output the arranged sequence to be transmitted to the digital-to-analog conversion unit. The digital-to-analog conversion unit is configured to perform digital-to-analog conversion on the received sequence to be transmitted to obtain a first analog electrical signal. The analog electro-optic conversion unit is configured to perform electro-optic conversion on the first analog electrical signal to obtain a first analog optical signal. The optical communication transmitter according to claim 7, wherein, The analog electro-optic conversion unit includes: an analog electrical signal amplification unit, an analog electrical signal biasing unit, and an electro-optic modulation unit; the analog electrical signal amplification unit is configured to amplify the first analog electrical signal to obtain an amplified first analog electrical signal; the analog electrical signal biasing unit is configured to perform DC biasing on the amplified first analog electrical signal; and the electro-optic modulation unit is configured to perform electro-optic conversion on the biased first analog electrical signal. An optical communication method, comprising: Receive mixed digital-analog optical signals and decompose the received mixed digital-analog optical signals into digital direct-transmission optical signals and analog optical signals; The digital direct-transmission optical signal is converted into a first received digital sequence; The analog optical signal is photoelectrically converted to obtain a first received analog electrical signal, and the first received analog electrical signal is converted from analog to digital to obtain a second received digital sequence, wherein the bit weight of the first received digital sequence is greater than the bit weight of the second received digital sequence; the first received digital sequence and the second received digital sequence are combined to form a received digital sequence. The method according to claim 9, further comprising, prior to the method: The receiver initialization parameters are set, wherein the receiver initialization parameters include at least one of the following: the original bit rate R of the transmitter. b0 The number of symbols K in a single frame, the number of bits L in a single symbol, and the proportion α of the digital direct transmission group to the total transmission sequence. The method according to claim 9, wherein, The simulated optical signal includes a first simulated optical signal and a second simulated optical signal. Before performing photoelectric conversion on the simulated optical signal, the method further includes: performing differential synthesis processing on the first simulated optical signal and the second simulated optical signal, and using the resulting differentially synthesized signal as the simulated optical signal for photoelectric conversion. An optical communication receiver includes: The system comprises a wavelet demultiplexing unit, a hybrid photoelectric conversion unit, and a receiver combination control unit, wherein: the wavelet demultiplexing unit is configured to receive a mixed digital-analog optical signal and decompose the received mixed digital-analog optical signal into a digital direct-transmission optical signal and an analog optical signal; the hybrid photoelectric conversion unit is configured to convert the digital direct-transmission optical signal into a first received digital sequence; perform photoelectric conversion on the analog optical signal to obtain a first received analog electrical signal, and perform analog-to-digital conversion on the first received analog electrical signal to obtain a second received digital sequence, wherein the bit weight of the first received digital sequence is greater than the bit weight of the second received digital sequence; and the receiver combination control unit is configured to combine the first received digital sequence and the second received digital sequence into a received digital sequence. The optical communication receiver according to claim 12, wherein, The hybrid photoelectric conversion unit includes: a receiving digital optical module unit, a digital direct receiving control unit, an analog photoelectric conversion unit, an analog-to-digital conversion unit, and an analog signal receiving control unit; the receiving digital optical module unit is configured to convert the received digital direct-transmission optical signal into a first digital electrical signal and output it to the digital direct receiving control unit; the digital direct receiving control unit is configured to perform time control and buffer control on the received first digital electrical signal; the analog photoelectric conversion unit is configured to perform photoelectric conversion on the analog optical signal to obtain a first received analog electrical signal and output it to the analog-to-digital conversion unit; the analog-to-digital conversion unit is configured to perform analog-to-digital conversion on the first received analog electrical signal to obtain a second digital electrical signal and output it to the analog signal receiving control unit; the analog signal receiving control unit is configured to arrange the received second digital electrical signals in a preset order. The optical communication receiver according to claim 13, wherein, The analog photoelectric conversion unit includes a photodetector and a photodetector driving circuit; the photodetector is configured to perform photoelectric conversion on the received analog optical signal under the driving control of the photodetector driving circuit to obtain a first received analog electrical signal. An optical communication device includes an optical communication transmitter and an optical communication receiver, wherein the optical communication transmitter includes: The optical communication receiver includes a transmit packet control unit, a hybrid electro-optical conversion unit, and a wavelength division multiplexing (WDM) unit. The transmit packet control unit is configured to acquire a sequence to be transmitted, and divide the sequence into a digital direct transmission group and an analog transmission group according to bit weights, wherein the bit weight of the digital direct transmission group is greater than the bit weight of the analog transmission group. The hybrid electro-optical conversion unit is configured to perform digital-to-analog conversion on the sequence to be transmitted in the analog transmission group to obtain a first analog electrical signal, and perform electro-optic modulation on the first analog electrical signal to obtain a first analog optical signal; and perform electro-optic conversion on the sequence to be transmitted in the digital direct transmission group to obtain a digital optical signal. The wavelength division multiplexing (WDM) unit is configured to... The system is configured to multiplex the first analog optical signal and the digital optical signal into a single optical signal for transmission; the wavelength decomposition and multiplexing unit is configured to receive the mixed digital-analog optical signal and decompose the received mixed digital-analog optical signal into a digital direct-transmission optical signal and an analog optical signal; the hybrid photoelectric conversion unit is configured to convert the digital direct-transmission optical signal into a first received digital sequence; the analog optical signal is photoelectrically converted to obtain a first received analog electrical signal, and the first received analog electrical signal is analog-to-digital converted to obtain a second received digital sequence, wherein the bit weight of the first received digital sequence is greater than the bit weight of the second received digital sequence; the receiving combination control unit is configured to combine the first received digital sequence and the second received digital sequence into a received digital sequence.

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