Phase compensation method and device for redundant MZI structure network

Abstract

The invention provides a phase compensation method and device for a redundant MZI structure network. The method comprises the following steps: adjusting each redundant dual-MZI structure unit in the redundant MZI structure network from an initial state to a first state; obtaining the output power of the output port of the redundant dual-MZI structure unit to be subjected to phase compensation under different external phase shifter phase values, and fitting to obtain a relation curve between the output power and the external phase shifter phase values; according to a preset corresponding relation between the phase value and the output power of the external phase shifter of each redundant double-MZI structure unit, the relation curve is corrected so as to carry out phase compensation on the external phase shifter of the redundant double-MZI structure unit to be subjected to phase compensation, and the preset corresponding relation is obtained through theoretical calculation; and performing phase compensation on the external phase shifters of the redundant double-MZI structure units to be subjected to phase compensation layer by layer from the first layer of the redundant MZI structure network. According to the invention, the problem of additional phase of a double-MZI structure is solved, the performance of a redundant MZI structure network is improved, and the realization of a large-scale multi-port interferometer is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of optoelectronic chips, and in particular to a phase compensation method and device for a redundant MZI structure network. Background Art

[0002] Due to factors such as material inhomogeneity and manufacturing errors in the processing technology, the beam splitter in the redundant Mach-Zehnder interferometer (MZI) cannot fully achieve the theoretically required splitting ratio, which leads to reduced MZI accuracy. In addition, the impact of such hardware errors will increase with the size of the multi-port interferometer.

[0003] At present, a redundant dual MZI structure can basically eliminate the hardware error of the beam splitter and improve the accuracy of the MZI.

[0004] However, the redundant dual MZI structure will introduce additional phase errors after the beam splitter error is eliminated, and the phase error will have a great impact on the performance of the MZI network, which is not conducive to the realization of large-scale multi-port interferometers. Summary of the invention

[0005] The present invention provides a phase compensation method and device for a redundant MZI structure network, which is used to solve the defect in the prior art that a redundant dual MZI structure introduces additional phase error, resulting in a decrease in the performance of the MZI network and being unfavorable for the realization of a large-scale multi-port interferometer.

[0006] The present invention provides a phase compensation method for a redundant MZI structure network, wherein the redundant MZI structure network is a layered structure network obtained by cascading a plurality of redundant dual MZI structure units, and the method comprises: Adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; Obtaining the output power of the output port of the redundant dual MZI structural unit to be phase compensated under different external phase shifter phase values, and fitting to obtain a relationship curve between the output power and the external phase shifter phase value; According to a preset corresponding relationship between the phase value and the output power of the external phase shifter of each redundant dual MZI structural unit, the relationship curve is corrected to perform phase compensation on the external phase shifter of the redundant dual MZI structural unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; Starting from the first layer of the redundant MZI structure network, phase compensation is performed layer by layer on the external phase shifters of the redundant dual MZI structure units to be phase compensated.

[0007] According to the phase compensation method for a redundant MZI structure network provided by the present invention, the specific steps of adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state include: Adjusting an internal phase shifter in each redundant dual MZI structural unit to adjust each MZI of each redundant dual MZI structural unit to a 50:50 beam splitting function; Each of the redundant dual MZI structural units is adjusted to a through state.

[0008] According to the phase compensation method for a redundant MZI structure network provided by the present invention, the specific steps of obtaining the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values ​​include: In the range of 0-2π, the phase value of the external phase shifter of the redundant dual MZI structural unit to be phase compensated is scanned, and the output power of the output port of the redundant dual MZI structural unit to be phase compensated is monitored at each phase value.

[0009] According to the phase compensation method for a redundant MZI structure network provided by the present invention, the step of calculating the preset corresponding relationship between the phase value and the output power of the external phase shifter of each redundant dual MZI structure unit includes: Calculating the output vector of each redundant dual MZI structural unit at different external phase shifter phase values ​​without considering any error, so as to obtain the corresponding relationship between the modulus of the corresponding element value of the output vector and the phase value of the external phase shifter; According to the preset corresponding relationship between the modulus of the corresponding element value of the output vector and the output power of the redundant dual MZI structural unit, the preset corresponding relationship between the phase value of the external phase shifter and the output power of each redundant dual MZI structural unit is equivalently obtained.

[0010] According to the phase compensation method for a redundant MZI structure network provided by the present invention, the phase compensation is achieved by compensating the voltage of an electrode on an external phase shifter.

[0011] According to the phase compensation method for a redundant MZI structure network provided by the present invention, the specific steps of correcting the relationship curve to perform phase compensation on the external phase shifter of the redundant dual MZI structure unit to be phase compensated include: Obtaining voltages V1 and V2 of the external phase shifter corresponding to when the output power in the relationship curve takes a maximum value and a minimum value; Obtain the output power value when the phase value of the external phase shifter is π / 2, 3π / 2, and π in the relationship curve to obtain the square of the voltage value of the external phase shifter when the phase value of the external phase shifter is π / 2, 3π / 2, and π , , ; Based on V 1、 V2, , , , calculate the voltage value V when the external phase shifter performs phase compensation x ; Apply a voltage V to the electrodes of the external phase shifter x .

[0012] According to the phase compensation method for redundant MZI structure network provided by the present invention, the V-based 1、 V2, , , , calculate the voltage value V when the external phase shifter performs phase compensation x The specific conversion formulas include: , The corresponding phase value ≥ The corresponding phase value is: , The corresponding phase value < The corresponding phase value is: .

[0013] According to the phase compensation method for a redundant MZI structure network provided by the present invention, the phase compensation is performed layer by layer on the external phase shifter of each redundant dual MZI structure unit to be phase compensated starting from the first layer of the redundant MZI structure network, including: Phase compensation is performed layer by layer on each redundant dual MZI structure unit in the redundant MZI structure network in the order of the layer where the input port of the redundant MZI structure network is located to the layer where the output port of the redundant MZI structure network is located.

[0014] The present invention also provides a phase compensation device for a redundant MZI structure network, wherein the redundant MZI structure network is a layered structure network obtained by cascading multiple redundant dual MZI structure units; The device comprises: A state adjustment module, used for adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; A relationship curve fitting module, used to obtain the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values, and to fit the relationship curve between the output power and the external phase shifter phase value; A compensation amount determination module, configured to correct the relationship curve according to a preset corresponding relationship between the phase value of the external phase shifter of each redundant dual MZI structural unit and the output power, so as to perform phase compensation on the external phase shifter of the redundant dual MZI structural unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; The phase compensation module is used to perform phase compensation on the external phase shifters of each of the redundant dual MZI structural units to be phase compensated layer by layer starting from the first layer of the redundant MZI structural network.

[0015] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the phase compensation method for a redundant MZI structure network as described in any one of the above is implemented.

[0016] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the phase compensation method for a redundant MZI structure network as described in any one of the above methods is implemented.

[0017] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements any of the above-mentioned phase compensation methods for a redundant MZI structure network.

[0018] The phase compensation method and device for a redundant MZI structure network provided by the present invention solves the additional phase problem caused by the dual MZI structure by compensating for the additional phase introduced by an external phase shifter to the dual MZI unit, improves the performance of the MZI network, and facilitates the realization of a large-scale multi-port interferometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a flow chart of a phase compensation method for a redundant MZI structure network provided by the present invention.

[0021] Figure 2 It is a structural schematic diagram of a Mach-Zehnder device provided by the prior art.

[0022] Figure 3 It is a structural schematic diagram of a dual MZI structure provided by the prior art.

[0023] Figure 4 It is a schematic diagram of the structure of a 4×4 multi-port interferometer provided in an embodiment of the present invention.

[0024] Figure 5 1 is a diagram showing the relationship between the modulus of the element value corresponding to the output vector provided in the first embodiment of the present invention and the phase introduced by the external phase shifter.

[0025] Figure 6 4 is a diagram showing the relationship between the modulus of the element value corresponding to the output vector provided by the second embodiment of the present invention and the phase introduced by the external phase shifter.

[0026] Figure 7 It is a schematic diagram of the offset between the measured curve and the theoretical curve in the redundant MZI structure network provided by an embodiment of the present invention.

[0027] Figure 8 It is a schematic diagram of the structure of an 8×8 multi-port interferometer provided in an embodiment of the present invention.

[0028] Fig. 9 It is a structural schematic diagram of a phase compensation device for a redundant MZI structure network provided by the present invention.

[0029] Fig.10 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention will be described in detail below in conjunction with specific implementation modes.

[0032] The embodiment of the present invention provides a phase compensation method for a redundant MZI structure network, which is used to compensate for the introduced additional phase error to improve the performance of the MZI structure network.

[0033] In some specific embodiments of the present invention, Figure 1 As shown, Figure 1 It is a flow chart of a phase compensation method for a redundant MZI structure network provided by the present invention. This scheme provides a phase compensation method for a redundant MZI structure network, and the redundant MZI structure network is a layered structure network obtained by cascading multiple redundant dual MZI structure units; Methods include: Step 100, adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; Step 200, obtaining the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values, and fitting to obtain a relationship curve between the output power and the external phase shifter phase value; Step 300: According to a preset corresponding relationship between the phase value and the output power of the external phase shifter of each redundant dual MZI structural unit, the relationship curve is corrected to perform phase compensation on the external phase shifter of the redundant dual MZI structural unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; Step 400 , starting from the first layer of the redundant MZI structure network, phase compensation is performed on the external phase shifters of each of the redundant dual MZI structure units to be phase compensated layer by layer.

[0034] It should be noted that in practical applications, multi-port interferometers are optical networks that can perform arbitrary unitary matrix transformations on the input vector of coherent light modes, and are key technologies for optical communications, information processing, and imaging. On-chip multi-port interferometers consist of reconfigurable beam splitters and phase shifter arrays, usually a cascade network of two-port Mach-Zehnder interferometers (MZIs), which are used in many important fields such as optical fiber communications, optical network information processing, quantum computing, optical neural networks, and imaging. Due to manufacturing errors in process processing and material inhomogeneity, the beam splitter in the MZI cannot fully achieve the theoretically required splitting ratio, which leads to reduced MZI accuracy, and the impact of such component errors increases with the size of the multi-port interferometer.

[0035] At present, some studies have proposed a redundant dual MZI structure, which can basically eliminate the hardware error of the beam splitter and improve the accuracy of the MZI. However, this redundant dual MZI structure will introduce additional phase errors after the beam splitter error is eliminated. This phase error does not affect the performance of a single MZI, but it will have a great impact on the performance of the MZI network, which is not conducive to the realization of large-scale multi-port interferometers.

[0036] Therefore, the present invention adjusts each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; obtains the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values, and fits to obtain a relationship curve between the output power and the phase value of the external phase shifter; corrects the relationship curve according to a preset corresponding relationship between the phase value of the external phase shifter of each redundant dual MZI structure unit and the output power, so as to perform phase compensation on the external phase shifter of the redundant dual MZI structure unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; and performs phase compensation on the external phase shifter of each redundant dual MZI structure unit to be phase compensated layer by layer starting from the first layer of the redundant MZI structure network, so as to solve the additional phase problem caused by the dual MZI structure, improve the performance of the MZI structure network, and can be used to realize a large-scale multi-port interferometer.

[0037] The above steps are described in detail below through specific embodiments.

[0038] Step 100, adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; In some possible implementations of the present invention, the specific steps of adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state include: Adjusting an internal phase shifter in each redundant dual MZI structural unit to adjust each redundant dual MZI structural unit to a 50:50 beam splitting function; Each of the redundant dual MZI structural units is adjusted to a through state.

[0039] Specifically, this embodiment provides an implementation method for adjusting the state of each redundant dual MZI structure unit in a redundant MZI structure network. For a traditional Mach-Zehnder MZI device, such as Figure 2 As shown, Figure 2 It is a schematic diagram of the structure of the Mach-Zehnder device provided by the prior art. The traditional Mach-Zehnder device consists of an external phase shifter (φ), an internal phase shifter (θ) and two 50:50 beam splitters (the beam splitters are usually directional couplers (DC) or multimode interference couplers (MMI)). Its transmission matrix is: (1); Transform formula (1) to obtain formula (2): (2); in, φ 1 and φ 2 represents the actual beam splitting conditions of the left and right beams respectively.

[0040] In a possible embodiment, for a dual MZI structure, such as Figure 3 As shown, Figure 3 The dual MZI structure provided by the prior art is a schematic diagram of the structure. The dual MZI structure consists of an external phase shifter (φ), three internal phase shifters (θ L ,θ M ,θ R ) and four 50:50 beam splitters (the beam splitters are usually directional couplers DC or multimode interference couplers MMI). Figure 3 In the dual MZI structure shown, the two complete MZIs on the left and right are regarded as adjustable beam splitters. Adjusting them to an ideal 50:50 beam splitting can achieve better performance than traditional MZIs.

[0041] It is worth noting that for the dual MZI unit in the MZI structure network, additional phase deviation will be generated after adjusting the left and right MZIs to achieve the ideal 50:50 splitting, which makes the phase difference between the two output ports inconsistent with the theoretical situation, thus affecting the performance of the next-level MZI in the network.

[0042] Furthermore, for a beam splitter in an ideal situation, that is, in formulas (1) and (2) φ 1 = φ 2=π / 4, when MZI is used as a 50:50 beam splitter, its transmission matrix R is: (3); When the MZI with non-ideal beam splitter is used as a 50:50 beam splitter, its transmission matrix R ’ for: (4); in, Compared with the ideal case of the beam splitter, its transmission matrix has obvious phase deviation.

[0043] In order to solve the above problems, a calibration algorithm can be used to adjust the external phase shifter of each dual MZI unit, and the phase can be scanned from 0 to 2π to obtain the output of the corresponding port. According to the scanning results and theoretical conditions, the working point of the external phase shifter to correct the additional phase deviation is found, and the additional phase deviation introduced in the process of adjusting the beam splitting effect of the MZI structure network is compensated to improve the performance of the entire MZI structure network.

[0044] Step 200, obtaining the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values, and fitting to obtain a relationship curve between the output power and the external phase shifter phase value; In some possible implementations of the present invention, the step of obtaining the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values ​​specifically includes: In the range of 0-2π, the phase value of the external phase shifter of the redundant dual MZI structural unit to be phase compensated is scanned, and the output power of the output port of the redundant dual MZI structural unit to be phase compensated is monitored at different phase values.

[0045] Specifically, this embodiment provides a method for obtaining the relationship between the redundant dual MZI structure unit under non-ideal conditions and the output power of the output port at different external phase shifter phase values ​​and each phase value, and obtains each scanning phase value and the output power of the corresponding port by scanning the phase from 0 to 2π.

[0046] Furthermore, in a non-ideal situation, a curve fitting is performed on the corresponding relationship between the phase value and the output power to obtain a relationship curve between the output power and the phase value of the external phase shifter.

[0047] Step 300: According to a preset corresponding relationship between the phase value and the output power of the external phase shifter of each redundant dual MZI structural unit, the relationship curve is corrected to perform phase compensation on the external phase shifter of the redundant dual MZI structural unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; In some possible implementations of the present invention, the step of obtaining a preset corresponding relationship between a phase value and an output power of an external phase shifter of each redundant dual MZI structural unit specifically includes: Calculating the output vector of each redundant dual MZI structural unit at different external phase shifter phase values ​​without considering any error, so as to obtain the corresponding relationship between the modulus of the corresponding element value of the output vector and the phase value of the external phase shifter; According to the preset corresponding relationship between the modulus of the corresponding element value of the output vector and the output power of the redundant dual MZI structural unit, the preset corresponding relationship between the phase value of the external phase shifter and the output power of each redundant dual MZI structural unit is equivalently obtained.

[0048] That is to say, the preset corresponding relationship in the embodiment of the present invention is based on the ideal corresponding relationship between the phase value and the output power of the external phase shifter of each redundant dual MZI structural unit obtained by theoretical calculation, without considering the additional phase error introduced by the redundant MZI structure network in the process of eliminating the beam splitter error, that is, the additional phase error is considered to be 0.

[0049] For example, for a 4×4 network with a dual MZI structure, Figure 4 As shown, Figure 4It is a structural diagram of a 4×4 multi-port interferometer provided in an embodiment of the present invention. First, it is necessary to complete the configuration of the left and right internal phase shifters in the dual MZI unit to realize the 50:50 beam splitting function of the two MZIs in the unit.

[0050] In a possible embodiment, such as embodiment 1: Figure 4 The MZI-C unit in θ M Taking the transmission matrix corresponding to the phase of π / 2 as an example, when the beam splitter is ideal and the external phase shifter of the MZI-C unit introduces a zero phase change, the transmission matrix S0 is: (5); When the input vector V0 is: (6) hours; The output vector U0 is: (7); When the external phase shifter introduces a π / 2 phase change, the transmission matrix S0 is: (8); At this time, the output vector U0 is: (9); When the external phase shifter introduces a 3π / 2 phase change, the transmission matrix S0 is: (10); At this time, the output vector U0 is: (11).

[0051] Here, the relationship between the modulus of the corresponding element value of the output vector U0 (U0 corresponds to the second element value) and the phase introduced by the external phase shifter is as follows: Figure 5 As shown, Figure 5 1 is a diagram showing the relationship between the modulus of the element value corresponding to the output vector provided in the first embodiment of the present invention and the phase introduced by the external phase shifter.

[0052] In a possible embodiment, such as embodiment 2: Figure 4 Take the MZI-B unit in the example as an example, and change the θ M When the phase is set to π / 2 and the external phase shifter of the MZI-B unit introduces a zero phase change, the corresponding transmission matrix S1 is: (12),

[0053] When the input vector V1 is: (13)

[0054] The output vector U1 is: (14); When the external phase shifter introduces a π / 2 phase change, the transmission matrix S1 is: (15),

[0055] At this time, the output vector U1 is: (16); When the external phase shifter introduces a phase change of π, the transmission matrix S1 is: (17),

[0056] At this time, the output vector U1 is: (18).

[0057] The relationship between the modulus of the corresponding element value of the output vector U1 (U1 corresponds to the first element value) and the phase introduced by the external phase shifter is as follows: Figure 6 As shown, Figure 6 4 is a diagram showing the relationship between the modulus of the element value corresponding to the output vector provided by the second embodiment of the present invention and the phase introduced by the external phase shifter.

[0058] It is worth noting that the element value corresponding to the output vector of each MZI unit is related to the position of the output port of the MZI unit in the multi-port interferometer. For example, in the above-mentioned embodiment 1, the output port of the MZI-C unit is the second port (such as Figure 4 Port 6 in the output vector), therefore, the calculated corresponding element value is the second element of the output vector; and the output port of the MZI-B unit in the second embodiment is the first port (such as Figure 4 Port 5 in the output vector), therefore, the calculated corresponding element value is the first element of the output vector. The relationship between the modulus of the corresponding element value of the MZI unit output vector at other positions and the phase introduced by the external phase shifter can be obtained according to this method, which will not be repeated here. For the 4×4 network of the dual MZI structure with a non-ideal beam splitter, the relationship between the modulus of the output vector element value and the phase introduced by the external phase shifter will be offset left and right compared with the ideal situation diagram, as shown in the figure below: Figure 7 As shown, Figure 7 is a schematic diagram of the offset between the measured curve and the theoretical curve in the redundant MZI structure network provided by the embodiment of the present invention, Figure 7Curve 1 in the middle is a theoretical curve, i.e., a relationship diagram between the modulus of the output vector element value calculated similarly to the above-mentioned embodiments 1 and 2 and the phase introduced by the external phase shifter. Curve 2 is a measured curve, i.e., a relationship diagram between the output power obtained by adjusting different phase values ​​of the external phase shifter and the phase value of the phase shifter. The left and right offsets between the two curves are the effects of the additional phase. By scanning and adjusting the phase of the external phase shifter of the dual MZI unit in the non-ideal network of the beam splitter so that its output is consistent with that of the ideal network of the beam splitter, the additional phase value Δφ in the figure can be compensated to restore the network to an ideal state.

[0059] It can be understood that this arrangement of the present invention fully considers the conditions of the MZI structure network under ideal and non-ideal conditions, and obtains the theoretical corresponding relationship between each phase value of the external phase shifter and the output power under the ideal state by theoretically calculating the modulus of the element value corresponding to the output vector under each phase value of the external phase shifter. The theoretical corresponding relationship is used as a preset corresponding relationship and compared with the actual relationship curve in the actual network structure, so that the actual relationship curve can be corrected to perform phase compensation on the external phase shifter of the redundant dual MZI structure unit to be phase compensated.

[0060] Further, in some possible implementations of the present invention, the step of correcting the relationship curve to perform phase compensation on the external phase shifter of the redundant dual MZI structural unit to be phase compensated specifically includes: Obtaining voltages V1 and V2 of the external phase shifter corresponding to when the output power in the relationship curve takes a maximum value and a minimum value; The output power value when the phase value of the external phase shifter is π / 2, 3π / 2, and π in the preset corresponding relationship is obtained to obtain the square of the voltage value of the external phase shifter when the phase value of the external phase shifter is π / 2, 3π / 2, and π: , , ; Based on V 1、 V2, , , , calculate the voltage value V when the external phase shifter performs phase compensation x ; Apply a voltage V to the electrodes of the external phase shifter x .

[0061] Specifically, this embodiment provides an implementation method for performing phase compensation on an external phase shifter, and the phase compensation is achieved by compensating the voltage of an electrode on the external phase shifter.

[0062] In a possible embodiment, the V-based 1、 V2, , , , calculate the voltage value V when the external phase shifter performs phase compensation x The specific conversion formulas include: when The corresponding phase value ≥ The corresponding phase value is: (19); when The corresponding phase value < The corresponding phase value is: , (20); in, , , satisfy: (twenty one).

[0063] Step 400 , starting from the first layer of the redundant MZI structure network, phase compensation is performed on the external phase shifters of each of the redundant dual MZI structure units to be phase compensated layer by layer.

[0064] In some possible implementations of the present invention, the step of performing phase compensation on the external phase shifters of the redundant dual MZI structural units to be phase compensated layer by layer starting from the first layer of the redundant MZI structural network specifically includes: Phase compensation is performed layer by layer on each redundant dual MZI structure unit in the redundant MZI structure network in the order of the layer where the input port of the redundant MZI structure network is located to the layer where the output port of the redundant MZI structure network is located.

[0065] Based on any of the above embodiments, in some specific embodiments of the present invention, still refer to Figure 4 , the implementation process of the phase compensation method for redundant MZI structure network proposed by the present invention applied to 4×4 multi-port interferometer is introduced as a whole. Since the additional phase deviation introduced by the MZI with non-ideal 50:50 beam splitting as a 50:50 beam splitter is fixed, it is not affected by the internal phase shifter θ M The phase of the Figure 4 The 4×4 multi-port interferometer shown in the figure first completes the configuration of the left and right internal phase shifters in the dual MZI unit to achieve the 50:50 beam splitting function of the two MZIs in the unit. All MZIs are adjusted to the bar state (phase shifter θ M is the initial phase); scan the V of φ of MZI-C πThe voltage makes the output power P6 of port 6 experience the minimum and maximum values ​​or the maximum and minimum values ​​successively, and the voltages V1 and V2 corresponding to φ are recorded. The relationship between the modulus of the second element value of the output vector of the non-ideal MZI of the beam splitter and the phase introduced by the external phase shifter deviates from the ideal situation, but the overall relationship is consistent with the ideal situation. Therefore, according to the recorded voltages V1 and V2, the voltage V required to compensate for the additional phase load on the external phase shifter can be converted by formulas (19), (21) or formulas (20), (21) x Thus, the additional phase compensation can be completed for the specified object MZI-C. Similar configuration process can be performed for other positions to complete the additional phase compensation. The configuration order is MZI-E and MZI-A on the first layer, MZI-C on the second layer, MZI-F and MZI-B on the third layer, and MZI-D on the fourth layer.

[0066] In some specific embodiments of the present invention, Figure 8 As shown, Figure 8 It is a schematic diagram of the structure of an 8×8 multi-port interferometer provided by an embodiment of the present invention. The phase compensation method for a redundant MZI structure network proposed in the present invention is applied to an 8×8 multi-port interferometer in the same configuration process as that applied to a 4×4 multi-port interferometer. The configuration order is as follows: from layer I to layer VIII, the phase compensation process of each dual MZI unit in each layer is independent of each other, and can be in a bottom-to-top or top-to-bottom order, and the order of phase compensation can also be adjusted according to actual needs. For larger-scale multi-port interferometers, the phase compensation method for a redundant MZI structure network proposed in the present invention can also be used.

[0067] As can be seen from the above embodiments, the present invention uses an external phase shifter to compensate for the additional phase introduced by the dual MZI unit through an algorithm. The algorithm is performed for a single dual MZI unit and is a local correction, so it is more suitable for a larger dual MZI structure network. The entire dual MZI structure network only needs to be calibrated once while keeping the phase of the external phase shifter fixed, which greatly saves calibration time and improves calibration accuracy.

[0068] The present invention proposes a phase compensation method for a redundant MZI structure network, which is applicable to a dual MZI structure network. By adjusting the external phase shifter of each dual MZI unit, the phase is scanned from 0 to 2π to obtain the output of the corresponding port, and a relationship diagram between the modulus of the corresponding element value of the output vector and the phase introduced by the external phase shifter is obtained. The relationship diagram here is used as an actual relationship diagram of the redundant dual MZI unit in the redundant MZI structure network. On this basis, the phase value of the external phase shifter corresponding to the maximum and minimum output values ​​is found in the relationship diagram, and the corresponding phase value of the output value corresponding to the external phase shifter phase value of 0 without considering any error is converted in combination with the theoretical calculation result, so as to complete the additional phase compensation. For the configuration of the MZI units of each level in the redundant Mach-Zehnder interferometer network, the configuration is completed in sequence according to the layer order. After the dual MZI units in the previous layer have completed the phase compensation, the phase compensation of the dual MZI units in the next layer is started. Since the phase compensation is performed on a single dual MZI unit, the phase compensation method proposed by the present invention is applicable to an interference network composed of redundant Mach-Zehnder interferometers of any dimension.

[0069] In some specific embodiments of the present invention, Fig. 9 As shown, the present solution provides a phase compensation device for a redundant MZI structure network, wherein the redundant MZI structure network is a layered structure network obtained by cascading multiple redundant dual MZI structure units; The device includes: A state adjustment module 910, configured to adjust each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; A relationship curve fitting module 920 is used to obtain the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values, and to fit the relationship curve between the output power and the external phase shifter phase value; A compensation amount determination module 930 is used to modify the relationship curve according to a preset corresponding relationship between the phase value of the external phase shifter of each redundant dual MZI structural unit and the output power, so as to perform phase compensation on the external phase shifter of the redundant dual MZI structural unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; The phase compensation module 940 is used to perform phase compensation on the external phase shifters of the redundant dual MZI structural units to be phase compensated layer by layer starting from the first layer of the redundant MZI structural network.

[0070] The phase compensation device for a redundant MZI structure network provided in an embodiment of the present invention has an implementation principle and beneficial effects similar to the implementation principle and beneficial effects of the phase compensation method for a redundant MZI structure network shown in the above embodiment. Please refer to the implementation principle and beneficial effects of the phase compensation method for a redundant MZI structure network shown in the above embodiment, and no further details will be given here.

[0071] Fig.10 An example of a physical structure diagram of an electronic device is shown in FIG. Fig.10 As shown, the electronic device may include: a processor (processor) 1010, a communication interface (Communications Interface) 1020, a memory (memory) 1030 and a communication bus 1040, wherein the processor 1010, the communication interface 1020, and the memory 1030 communicate with each other through the communication bus 1040. The processor 1010 can call the logic instructions in the memory 1030 to execute the phase compensation method for the redundant MZI structure network, the method comprising: adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; obtaining the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values, and fitting to obtain a relationship curve between the output power and the phase value of the external phase shifter; according to a preset corresponding relationship between the phase value of the external phase shifter of each of the redundant dual MZI structure units and the output power, correcting the relationship curve to perform phase compensation on the external phase shifter of the redundant dual MZI structure unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; and performing phase compensation on the external phase shifter of each of the redundant dual MZI structure units to be phase compensated layer by layer starting from the first layer of the redundant MZI structure network.

[0072] It should be noted that the electronic device in this embodiment can be a server, a PC, or other devices in specific implementation, as long as its structure includes the following: Fig.10 The processor 1010, communication interface 1020, memory 1030 and communication bus 1040 are shown, wherein the processor 1010, communication interface 1020, and memory 1030 communicate with each other through the communication bus 1040, and the processor 1010 can call the logic instructions in the memory 1030 to execute the above method. This embodiment does not limit the specific implementation form of the electronic device.

[0073] The server may be a single server or a server group. The server group may be centralized or distributed (for example, the server may be a distributed system).

[0074] In a possible embodiment, the server can be local or remote relative to the terminal. For example, the server can access information stored in the user terminal, database or any combination thereof via a network.

[0075] As another example, the server may be directly connected to at least one of the user terminal and the database to access information and / or data stored therein.

[0076] In a possible embodiment, the server may be implemented on a cloud platform; by way of example only, the cloud platform may include a private cloud, a public cloud, a hybrid cloud, a community cloud, a distributed cloud, an inter-cloud, a multi-cloud, etc., or any combination thereof.

[0077] In a possible embodiment, the server and the user terminal may be implemented on an electronic device having one or more components in the embodiments of the present invention.

[0078] Furthermore, the network may be used for the exchange of information and / or data.

[0079] In a possible embodiment, one or more components in the interactive scenario (eg, a server, a user terminal, and a database) may send information and / or data to other components.

[0080] In possible embodiments, the network may be any type of wired or wireless network, or a combination thereof. As examples only, the network may include a wired network, a wireless network, a fiber optic network, a telecommunications network, an intranet, the Internet, a local area network (LAN), a wide area network (WAN), a wireless local area network (WLAN), a metropolitan area network (MAN), a wide area network (WAN), a public switched telephone network (PSTN), a Bluetooth network, a ZigBee network, or a near field communication (NFC) network, or any combination thereof.

[0081] In a possible embodiment, the network may include one or more network access points. For example, the network may include a wired or wireless network access point, such as a base station and / or a network switching node, through which one or more components of the interactive scene may connect to the network to exchange data and / or information.

[0082] In addition, the logic instructions in the memory 1030 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

[0083] Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., various media that can store program codes.

[0084] In a possible embodiment, an embodiment of the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the processor executes the phase compensation method for a redundant MZI structure network provided in the above embodiments, the method comprising: adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; obtaining the output power of the output port of the redundant dual MZI structure unit to be phase compensated at different external phase shifter phase values, and fitting to obtain a relationship curve between the output power and the phase value of the external phase shifter; correcting the relationship curve according to a preset corresponding relationship between the phase value of the external phase shifter of each of the redundant dual MZI structure units and the output power, so as to perform phase compensation on the external phase shifter of the redundant dual MZI structure unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; and performing phase compensation on the external phase shifter of each of the redundant dual MZI structure units to be phase compensated layer by layer starting from the first layer of the redundant MZI structure network.

[0085] In a possible embodiment, an embodiment of the present invention further provides a computer program product, the computer program product includes a computer program stored on a non-transitory computer-readable storage medium, the computer program includes program instructions, when the program instructions are executed by a computer, the computer can execute the phase compensation method for a redundant MZI structure network provided by the above-mentioned method embodiments, the method comprising: adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; obtaining the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values, and fitting to obtain a relationship curve between the output power and the phase value of the external phase shifter; according to a preset corresponding relationship between the phase value of the external phase shifter of each of the redundant dual MZI structure units and the output power, correcting the relationship curve to perform phase compensation on the external phase shifter of the redundant dual MZI structure unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; starting from the first layer of the redundant MZI structure network, performing phase compensation on the external phase shifter of each of the redundant dual MZI structure units to be phase compensated layer by layer.

[0086] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Those of ordinary skill in the art may understand and implement it without creative effort.

[0087] Through the description of the above implementation modes, those skilled in the art can clearly understand that each implementation mode can be implemented by means of software plus a necessary general hardware platform, or of course by hardware. Based on such an understanding, the above technical solution can essentially or in other words be embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A phase compensation method for a redundant MZI structure network, wherein the redundant MZI structure network is a layered structure network obtained by cascading multiple redundant dual MZI structure units, characterized in that: The method comprises: Adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; Obtaining the output power of the output port of the redundant dual MZI structural unit to be phase compensated under different external phase shifter phase values, and fitting to obtain a relationship curve between the output power and the external phase shifter phase value; According to a preset corresponding relationship between the phase value and the output power of the external phase shifter of each redundant dual MZI structural unit, the relationship curve is corrected to perform phase compensation on the external phase shifter of the redundant dual MZI structural unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; Starting from the first layer of the redundant MZI structure network, phase compensation is performed layer by layer on the external phase shifters of the redundant dual MZI structure units to be phase compensated.

2. The phase compensation method for a redundant MZI structure network according to claim 1, characterized in that: The specific steps of adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state include: Adjusting an internal phase shifter in each redundant dual MZI structural unit to adjust each MZI of each redundant dual MZI structural unit to a 50:50 beam splitting function; Each of the redundant dual MZI structural units is adjusted to a through state.

3. The phase compensation method for a redundant MZI structure network according to claim 1, characterized in that: The specific steps of obtaining the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values ​​include: In the range of 0-2π, the phase value of the external phase shifter of the redundant dual MZI structural unit to be phase compensated is scanned, and the output power of the output port of the redundant dual MZI structural unit to be phase compensated is monitored at each phase value.

4. The phase compensation method for a redundant MZI structure network according to claim 1, characterized in that: The step of calculating the preset corresponding relationship between the phase value and the output power of the external phase shifter of each redundant dual MZI structural unit comprises: Calculating the output vector of each redundant dual MZI structural unit at different external phase shifter phase values ​​without considering any error, so as to obtain the corresponding relationship between the modulus of the corresponding element value of the output vector and the phase value of the external phase shifter; According to the preset corresponding relationship between the modulus of the corresponding element value of the output vector and the output power of the redundant dual MZI structural unit, the preset corresponding relationship between the phase value of the external phase shifter and the output power of each redundant dual MZI structural unit is equivalently obtained.

5. The phase compensation method for a redundant MZI structure network according to claim 4, characterized in that: The phase compensation is achieved by compensating the voltage of the electrode on the external phase shifter.

6. The phase compensation method for a redundant MZI structure network according to claim 5, characterized in that: The specific steps of correcting the relationship curve to perform phase compensation on the external phase shifter of the redundant dual MZI structural unit to be phase compensated include: Obtaining voltages V1 and V2 of the external phase shifter corresponding to when the output power in the relationship curve takes a maximum value and a minimum value; Obtain the output power value when the phase value of the external phase shifter is π / 2, 3π / 2, and π in the relationship curve to obtain the square of the voltage value of the external phase shifter when the phase value of the external phase shifter is π / 2, 3π / 2, and π , , ; Based on V 1、 V2, , , , calculate the voltage value V when the external phase shifter performs phase compensation x ; Apply a voltage V to the electrodes of the external phase shifter x .

7. The phase compensation method for a redundant MZI structure network according to claim 6, characterized in that: The V 1、 V2, , , , calculate the voltage value V when the external phase shifter performs phase compensation x The specific conversion formulas include: , The corresponding phase value ≥ The corresponding phase value is: , The corresponding phase value < The corresponding phase value is: 。 8. The phase compensation method for a redundant MZI structure network according to any one of claims 1 to 7, characterized in that: The phase compensation is performed layer by layer on the external phase shifter of each redundant dual MZI structure unit to be phase compensated starting from the first layer of the redundant MZI structure network, including: Phase compensation is performed layer by layer on each redundant dual MZI structure unit in the redundant MZI structure network in the order of the layer where the input port of the redundant MZI structure network is located to the layer where the output port of the redundant MZI structure network is located.

9. A phase compensation device for a redundant MZI structure network, characterized in that: The redundant MZI structure network is a layered structure network obtained by cascading multiple redundant dual MZI structure units; The device comprises: A state adjustment module, used for adjusting each redundant dual MZI structure unit in the redundant MZI structure network from an initial state to a first state; A relationship curve fitting module, used to obtain the output power of the output port of the redundant dual MZI structure unit to be phase compensated under different external phase shifter phase values, and to fit the relationship curve between the output power and the external phase shifter phase value; A compensation amount determination module, configured to correct the relationship curve according to a preset corresponding relationship between the phase value of the external phase shifter of each redundant dual MZI structural unit and the output power, so as to perform phase compensation on the external phase shifter of the redundant dual MZI structural unit to be phase compensated, wherein the preset corresponding relationship is obtained by theoretical calculation; The phase compensation module is used to perform phase compensation on the external phase shifters of each of the redundant dual MZI structural units to be phase compensated layer by layer starting from the first layer of the redundant MZI structural network.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the phase compensation method for a redundant MZI structure network as claimed in any one of claims 1 to 8 is implemented.

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