Coupled resonant cavity optical waveguide, optical calculation unit and photoelectric calculation system

Abstract

The invention provides a coupling resonant cavity optical waveguide, an optical calculation unit and a photoelectric calculation system. The coupling resonant cavity optical waveguide comprises a plurality of micro-rings arranged in sequence and a plurality of first optical modulators, wherein every two adjacent micro-rings are coupled with each other; a coupling region between every two adjacent micro-rings is provided with a first light modulator; each first optical modulator is configured to adjust the phase difference of optical signals in two adjacent micro-rings; the coupling region between every two adjacent micro-rings comprises a first coupling region and a second coupling region; wherein the first coupling region is configured to perform light splitting on an optical signal of one of the two adjacent micro-rings; and the second coupling region is configured to perform beam combination on the optical signals subjected to phase difference adjustment in the two adjacent micro-rings. In this way, the calculation density and efficiency of the optical calculation unit can be improved.

Description

Technical Field

[0001] The present disclosure relates to, but is not limited to, a coupled resonant cavity optical waveguide, an optical computing unit, and an optoelectronic computing system. Background Art

[0002] Micro-Ring Resonator (MRR) can use the multiple wraps and interference of light in a micro ring (MR) to achieve precise control of optical signals, thereby realizing complex optical operations such as addition, multiplication, and logical operations. However, the computing power that can be achieved when using micro rings for optical computing is currently very limited, so the computing power of the computing unit needs to be further improved. Summary of the invention

[0003] In view of this, the embodiments of the present disclosure provide a coupled resonant cavity optical waveguide, an optical computing unit, and an optoelectronic computing system to improve the computing power of the computing unit.

[0004] The technical solution of the embodiment of the present disclosure is implemented as follows:

[0005] The embodiment of the present disclosure provides a coupled resonant cavity optical waveguide, comprising: a plurality of micro-rings arranged in sequence and a plurality of first optical modulators; wherein every two adjacent micro-rings are coupled to each other; a first optical modulator is provided in a coupling region between every two adjacent micro-rings; each of the first optical modulators is configured to adjust the phase difference of optical signals in two adjacent micro-rings; the coupling region between every two adjacent micro-rings comprises: a first coupling region and a second coupling region; wherein the first coupling region is configured to split the optical signal of one of the two adjacent micro-rings; and the second coupling region is configured to combine the optical signals in the two adjacent micro-rings after the phase difference adjustment is completed.

[0006] In the above scheme, the coupled resonant cavity optical waveguide also includes: a plurality of second optical modulators; wherein each of the second optical modulators is disposed on a corresponding one of the microrings and is configured to adjust the round-trip transmission coefficient and / or round-trip phase shift of the microring.

[0007] In the above scheme, each of the first optical modulators includes: a first electrode and a second electrode; wherein the first electrode and the second electrode are respectively arranged on two adjacent micro-rings, and are respectively configured to adjust the phase of the optical signal in the corresponding micro-ring.

[0008] In the above solution, the structures of the plurality of first optical modulators and the plurality of second optical modulators are the same.

[0009] The embodiment of the present disclosure also provides an optical computing unit, comprising a first waveguide, a second waveguide and a coupled resonant cavity optical waveguide as described in any one of the above schemes; wherein the first waveguide is configured to receive an input optical signal; the coupled resonant cavity optical waveguide is coupled to the first waveguide and is configured to perform linear calculation on the input optical signal to generate an output optical signal; the second waveguide is coupled to the coupled resonant cavity optical waveguide and is configured to output the output optical signal.

[0010] In the above scheme, the coupled resonant cavity optical waveguide also includes: a wavelength control unit; wherein the wavelength control unit is arranged on the microring and is configured to adjust the resonant wavelength of the microring based on the wavelength offset corresponding to the doped waveguide region.

[0011] In the above scheme, the optical computing unit also includes: a third optical modulator; wherein the third optical modulator is provided in the coupling region between the first waveguide and / or the second waveguide and the coupled resonant cavity optical waveguide; the third optical modulator is configured to adjust the phase difference between the optical signal in the first waveguide and / or the second waveguide and the coupled resonant cavity optical waveguide.

[0012] In the above scheme, the coupling region between the first waveguide and the coupled resonant cavity optical waveguide includes: a third coupling region and a fourth coupling region; and / or, the coupling region between the second waveguide and the coupled resonant cavity optical waveguide includes: a fifth coupling region and a sixth coupling region; wherein the third coupling region is configured to split the input optical signal to generate a first intermediate optical signal and a second intermediate optical signal; the fourth coupling region is configured to combine the first intermediate optical signal and the second intermediate optical signal after the phase difference adjustment is completed; the fifth coupling region is configured to split the optical signal in the microring coupled with the second waveguide to generate a third intermediate optical signal and a fourth intermediate optical signal; the sixth coupling region is configured to combine the third intermediate optical signal and the fourth intermediate optical signal after the phase difference adjustment is completed.

[0013] In the above solution, the optical computing unit further includes: a third optical waveguide; wherein the third optical waveguide is coupled to any one of the plurality of micro-rings in the coupled resonant cavity optical waveguide, and is configured to output an intermediate optical signal generated by the coupled resonant cavity optical waveguide.

[0014] The disclosed embodiment also provides a coupled resonant cavity optical waveguide array, comprising: the first waveguide and the second waveguide are parallel to each other; wherein the two micro-rings located at the head and the end of the coupled resonant cavity optical waveguide are coupled to the first waveguide and the second waveguide respectively.

[0015] An embodiment of the present disclosure provides an optoelectronic computing system, comprising: a central processing unit and an optical computing unit as described in any one of the above-mentioned schemes; the central processing unit is communicatively connected to the optical computing unit and is configured to input a control signal to the optical computing unit; one or more of the first optical modulator, the second optical modulator and the third optical modulator of the optical computing unit are configured to perform linear calculation on the input optical signal based on the linear weighting coefficient corresponding to the control signal.

[0016] The disclosed embodiment provides a coupled resonant cavity optical waveguide, comprising: a plurality of microrings arranged in sequence and a plurality of first optical modulators; wherein, every two adjacent microrings are coupled to each other; the coupling region between every two adjacent microrings is provided with the first optical modulator; each of the first optical modulators is configured to adjust the phase difference of the optical signal in the two adjacent microrings; the coupling region between every two adjacent microrings comprises: a first coupling region and a second coupling region; wherein, the first coupling region is configured to split the optical signal of one of the two adjacent microrings; the second coupling region is configured to combine the optical signals in the two adjacent microrings after the phase difference adjustment is completed. In this way, compared with the microrings in the related art, the disclosed embodiment can also use the coupling region between adjacent microrings to perform a linear operation, thereby improving the average computing power of each microring. Therefore, under the same area, the disclosed embodiment can improve the computing density and efficiency of the optical computing unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the structure of the coupled resonant cavity optical waveguide provided in the embodiment of the present disclosure Figure 1 ;

[0018] Figure 2 A schematic diagram of the structure of the coupling region between two micro-rings provided in an embodiment of the present disclosure;

[0019] Figure 3 Schematic diagram of the structure of the coupled resonant cavity optical waveguide provided in the embodiment of the present disclosure Figure 2 ;

[0020] Figure 4 A schematic diagram of the structure of the optical computing unit provided in the embodiment of the present disclosure Figure 1 ;

[0021] Figure 5 A schematic diagram of the structure of the coupling region between the first waveguide and the coupled resonant cavity optical waveguide provided in an embodiment of the present disclosure;

[0022] Figure 6 A schematic diagram of the structure of the optical computing unit provided in the embodiment of the present disclosure Figure 2 ;

[0023] Figure 7A schematic diagram of the structure of the coupling region between the first waveguide and the coupled resonant cavity optical waveguide provided in an embodiment of the present disclosure;

[0024] Figure 8 A schematic diagram of the structure of the coupling region between the second waveguide and the coupled resonant cavity optical waveguide provided in an embodiment of the present disclosure;

[0025] Fig. 9 A schematic diagram of the structure of the optical computing unit provided in the embodiment of the present disclosure Figure 3 ;

[0026] Fig.10 A schematic diagram of the structure of an optoelectronic computing system provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions of the present disclosure are further elaborated in detail below in conjunction with the drawings and embodiments. The described embodiments should not be regarded as limiting the present disclosure. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0028] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0029] If similar descriptions of "first / second" appear in the application documents, the following description is added. In the following description, the terms "first / second / third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understandable that "first / second / third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present disclosure described herein can be implemented in an order other than that illustrated or described herein.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used herein are only for the purpose of describing the embodiments of the present disclosure and are not intended to limit the present disclosure.

[0031] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0032] Figure 1 is a schematic diagram of an optional coupled resonant cavity optical waveguide 100 provided in an embodiment of the present disclosure, with reference to Figure 1 The coupled resonant cavity optical waveguide 100 includes a plurality of sequentially arranged microrings MR1 ​​to MRn and a plurality of first optical modulators 20. The microrings MR1 ​​to MRn are all formed by waveguides (Optical Waveguide). The first optical modulator 20 can be any one of a piezoelectric optical phase shifter, an electro-optical phase shifter or a thermo-optical phase shifter. Every two adjacent microrings are coupled to each other, and a first optical modulator 20 is provided in a coupling region 10 between every two adjacent microrings. For example, the microrings MR1 ​​and MR2 are coupled to each other through the coupling region 10 therebetween, and the first optical modulator 20 is provided in the coupling region 10.

[0033] Figure 2 is a schematic diagram of an optional coupling region 10 provided in an embodiment of the present disclosure. It should be noted that: Figure 2 The example is out Figure 1 The coupling region of the microrings MR1 ​​and MR2 is 10, and the coupling regions of the remaining microrings can be referred to Figure 2 It should also be noted that more coupling regions may be included between two adjacent micro-rings to increase the number of calculations, which is not limited here.

[0034] In the present disclosure, in combination Figure 1 and Figure 2, the coupling region 10 between each two adjacent microrings includes a first coupling region 101 and a second coupling region 102. The first coupling region 101 is configured to split the optical signal of one of the two adjacent microrings MR. Each first optical modulator 20 is configured to adjust the phase difference of the optical signal in the two adjacent microrings. The second coupling region 102 is configured to combine the optical signals in the two adjacent microrings after the phase difference adjustment. In other words, the coupled resonant cavity optical waveguide 100 can use the first coupling region 101 between the two adjacent microrings to split the optical signal, and then introduce the phase difference into the optical signal after the splitting in the two adjacent microrings through the first optical modulator 20, and finally, combine the two optical signals with the phase difference through the second coupling region 102 between the two adjacent microrings. In this way, the coupling region 10 between the two adjacent microrings and the first optical modulator 20 set on the coupling region 10 can realize a linear calculation.

[0035] The principle of linear calculation of the coupled resonant cavity optical waveguide 100 is described below by taking multiplication operation as an example:

[0036] refer to Figure 2 , the relationship between the amplitudes of the optical signals at the ports of the coupling region 10 between the microrings MR1 ​​and MR2 can be expressed as follows:

[0037]

[0038] By rearranging the above formula (1), it can be obtained that the amplitude effective coupling coefficient between the coupling region 10 and the first optical modulator 20 is as shown in the following formula (2):

[0039]

[0040] It should be noted that in a waveguide system, the amplitude effective coupling coefficient refers to a parameter that describes the efficiency of light energy transfer between waveguides or between a waveguide and other optical elements. It reflects the degree to which light energy is coupled from one waveguide to another waveguide or element. In formula (1), E3 and E4 are the amplitudes of the light signals on both sides of the coupling region of microring MR1, and E5 and E6 are the amplitudes of the light signals on both sides of the coupling region of microring MR2. The amplitude of a light signal usually refers to the intensity or amplitude of the light signal, which determines the energy of the light signal. In optical computing, the amplitude of a light signal is one of the important parameters for transmitting information. By modulating the amplitude of the light signal, information encoding and decoding can be achieved. In formulas (1) and (2), α1 is the transmission coefficient of the light signal in microring MR1 after passing through the coupling region 10. is the phase change value of the optical signal in the micro-ring MR1 after passing through the coupling region 10. In formulas (1) and (2), α2 is the transmission coefficient of the optical signal in the micro-ring MR2 after passing through the coupling region 10. is the phase change value of the optical signal in the micro-ring MR2 after passing through the coupling region 10. In formulas (1) and (2), t is the self-coupling coefficient of the partial waveguide of the micro-ring MR1 in the first coupling region 101 and the second coupling region 102. The self-coupling coefficient refers to the coupling strength of the self-coupling of the mode in the waveguide caused by the disturbance of another waveguide, which can be expressed as the spatial overlap of the mode field of a waveguide in the cross section of another waveguide. The larger the self-coupling coefficient, the easier it is for the light energy in the waveguide to self-couple in the same waveguide. In formulas (1) and (2), k is the cross-coupling coefficient of the partial waveguide of the micro-ring MR2 in the first coupling region 101 and the second coupling region 102. The cross-coupling coefficient is opposite to the self-coupling coefficient, and it describes the light energy coupling strength between different waveguides or modes. In a waveguide system, the size of the cross-coupling coefficient determines the efficiency of light energy transfer from one waveguide or mode to another waveguide or mode. The sum of the squares of t and k is 1. In formulas (1) and (2), i is an imaginary unit.

[0041] In the embodiment of the present disclosure, combining formula (2) and Figure 1 The first optical modulator 20 can control the phase difference of the optical signal in the microrings MR1 ​​and MR2, thereby controlling the effective coupling coefficient of the coupling region 10 of the microrings MR1 ​​and MR2. In other words, the embodiment of the present disclosure can control the phase of the optical signal through the first optical modulator 20 to load the weighting coefficient of the linear calculation.

[0042] It can be understood that the coupling region 10 between two adjacent microrings and the first optical modulator 20 provided on the coupling region 10 in the embodiment of the present disclosure can realize a linear calculation. In this way, compared with the microrings in the related art, on the basis that the microrings can perform linear calculations, the embodiment of the present disclosure can also use the coupling region between adjacent microrings to perform a linear operation, thereby improving the computing power of a single microring. Therefore, under the same area, the embodiment of the present disclosure can improve the computing density and efficiency of the optical computing unit.

[0043] In some embodiments of the present disclosure, reference Figure 2, each first optical modulator 20 includes a first electrode 21 and a second electrode 22. The materials of the first electrode 21 and the second electrode 22 may be metal materials such as aluminum (Al), copper (Cu) or tungsten (Wu). For example, the first optical modulator 20 may be a thermo-optical phase shifter. The first electrode 21 and the second electrode 22 may be heating elements. The first electrode 21 and the second electrode 22 may realize phase shifting and modulation of the optical signal by controlling the temperature of the waveguide. The first electrode 21 and the second electrode 22 are respectively arranged on two adjacent microrings, and are respectively configured to adjust the phase of the optical signal in the corresponding microring. For example, the first electrode 21 is arranged on the microring MR1, and the second electrode 22 is arranged on the microring MR2. The first electrode 21 and the second electrode 22 may respectively adjust the refractive index of the contacted waveguide material by changing the temperature of the waveguide material contacted on the microrings MR1 ​​and MR2, thereby changing the propagation optical path and phase of the optical signal.

[0044] It should be noted that Figure 2 The first optical modulator 20 shown in the figure includes a first electrode 21 and a second electrode 22. The first optical modulator 20 may also include only one of the first electrode 21 and the second electrode 22, which is not limited here.

[0045] Figure 3 is a schematic diagram of the structure of another optional coupled resonant cavity optical waveguide 100 provided in an embodiment of the present disclosure. It should be noted that: Figure 3 Each of the micro-rings MR1 ​​to MRn shown is provided with a second optical modulator 30 . The coupled resonant cavity optical waveguide 100 may also be provided with a second optical modulator 30 only on some of the micro-rings MR1 ​​to MRn, which is not limited here.

[0046] In some embodiments of the present disclosure, reference Figure 3 The coupled resonant cavity optical waveguide 100 further includes a plurality of second optical modulators 30. The plurality of second optical modulators 30 can all be intensity modulators. The second optical modulators 30 can modulate the light intensity and / or phase by changing the physical parameters of the optical path or utilizing the electro-optical effect.

[0047] In the embodiments of the present disclosure, reference Figure 3 , each second optical modulator 30 is arranged on a corresponding microring. Each second optical modulator 30 is configured to adjust the round trip transmission coefficient and / or round trip phase shift of the microring. The round trip transmission coefficient refers to the ratio of the amplitude of the light transmitted from the output port to the amplitude of the input light after the optical signal propagates one circle in the ring waveguide or resonant cavity. The round trip phase shift refers to the change in the phase of the optical signal relative to the phase of the input optical signal after the optical signal propagates one circle in the ring waveguide or resonant cavity.

[0048] For example, the second optical modulator 30 on the microring MR1 can adjust the round-trip transmission coefficient of the microring MR1 by adjusting the coupling coefficient of the waveguide in contact. For another example, the second optical modulator 30 on the microring MR1 can adjust the round-trip phase shift of the microring MR1 by adjusting the resonant state of the optical signal in the microring MR1. For another example, the second optical modulator 30 on the microring MR1 can simultaneously adjust the round-trip phase shift and the round-trip transmission coefficient of the microring MR1. In this way, the embodiment of the present disclosure can adjust the round-trip transmission coefficient and the round-trip phase shift of the microring through the second optical modulator 30 to control the interference of the optical signal in the microring, and then realize the linear calculation and processing of the optical signal. Thereby, the computing density and efficiency of the optical computing unit are further improved.

[0049] In some embodiments of the present disclosure, Figure 2 and Figure 3 , the structures of the plurality of first optical modulators 20 and the plurality of second optical modulators 30 are the same. For example, Figure 2 The first optical modulator 20 and Figure 3 The second optical modulator 30 in the embodiment is a thermo-optical phase shifter, and the first optical modulator 20 includes a first electrode 21 and a second electrode 22 and a Figure 3 The electrodes of the second optical modulator 30 are all arranged on the surface of the micro-ring MR1. For another example, Figure 2 The first optical modulator 20 and Figure 3 The second optical modulators 30 in the embodiment may all be electro-optical phase shifters. Figure 2 The first optical modulator 20 and Figure 3 The second optical modulator 30 in the micro-ring MR1 can be formed by doping the micro-ring MR1 with elements. In this way, in the process of manufacturing the coupled resonant optical waveguide, the first optical modulator 20 and the second optical modulator 30 can be simultaneously manufactured on the formed multiple micro-rings. Thus, the manufacturing process can be simplified and the integration can be improved.

[0050] Figure 4 is a schematic diagram of the structure of an optional optical computing unit 200 provided in an embodiment of the present disclosure. It should be noted that: Figure 4 The first waveguide 201 shown is an input waveguide, and the second waveguide 202 is an output waveguide. The first waveguide 201 may also be an output waveguide, and the second waveguide 202 may also be an input waveguide, which is not limited here. in is the input optical signal, E th is the direct optical signal, E add To upload optical signals, E drop The coupled resonant cavity optical waveguide 100 is connected to the first waveguide 201 and the second waveguide 202 through Figure 5 The coupling regions 50 are shown coupled to each other.

[0051] In some embodiments of the present disclosure, reference Figure 4 , the optical computing unit 200 includes a first waveguide 201, a second waveguide 202 and a coupled resonant cavity optical waveguide 100. The first waveguide 201 is configured to receive an input optical signal. The input optical signal received by the first waveguide 201 may be a multi-wavelength optical signal. For example, the input optical signal may be modulated by single-wavelength optical signals of four different wavelengths (λ1, λ2, λ3 and λ4). The multi-wavelength optical signal may also be modulated by a greater number of single-wavelength optical signals.

[0052] Figure 5 is a schematic diagram of an optional coupling region 50 provided in an embodiment of the present disclosure. It should be noted that: Figure 5 The coupling region 50 shown includes only one coupling area, and the coupling region 50 may also include a greater number of coupling areas, which is not limited here. Figure 5 The coupling region 50 shown is the coupling region between the first waveguide 201 and the microring MR1, and the coupling region between the second waveguide 202 and the microring MRn can be referred to. Figure 5 The above is for your understanding and will not be elaborated here.

[0053] In the embodiments of the present disclosure, reference Figure 4 , the coupled resonant cavity optical waveguide 100 can be passed through Figure 5 The coupling region 50 shown is coupled to the first waveguide 201 to receive an input optical signal. The coupled resonant cavity optical waveguide 100 is configured to perform linear calculations on the input optical signal to generate an output optical signal. The second waveguide 202 is coupled to the coupled resonant cavity optical waveguide 100. The second waveguide 202 is configured to output an optical signal. In this way, the first waveguide 201 couples the input optical signal to the coupled resonant cavity optical waveguide 100 for multiple linear calculations, and the second waveguide 202 outputs the output optical signal after multiple linear calculations. Therefore, compared with the optical computing unit in the related art, the embodiment of the present disclosure can also use the coupled resonant cavity optical waveguide 100 to perform multiple linear operations, which can improve the computing density and efficiency of the optical computing unit.

[0054] In some embodiments of the present disclosure, reference Figure 4 , the first waveguide 201 and the second waveguide 202 are parallel to each other. The two microrings at the head and the end of the coupling resonant cavity optical waveguide 100 are respectively coupled to the first waveguide 201 and the second waveguide 202. For example, the microring MR1 is a microring at the head position of the coupling resonant cavity optical waveguide 100, and the microring MR1 is coupled to the first waveguide 201. The microring MRn is a microring at the tail position of the coupling resonant cavity optical waveguide 100, and the microring MRn is coupled to the second waveguide 202.

[0055] It should be noted that Figure 4The angle between the connecting line of the centers of the multiple micro-rings MR1-MRn of the coupled resonant cavity optical waveguide 100 and the first waveguide 201 is 90 degrees, and the angle between the connecting line of the centers of the multiple micro-rings MR1-MRn and the first waveguide 201 can also be other angles, which are not limited here. The micro-ring can also be in other shapes such as a racetrack shape and a rounded square.

[0056] Figure 6 It is a schematic structural diagram of an optional optical computing unit 200 provided in an embodiment of the present disclosure. It should be noted that the coupled resonant cavity optical waveguide 100 in the optical computing unit 200 includes two micro-rings MR1 ​​and MR2. The coupled resonant cavity optical waveguide 100 may also include a larger number of micro-rings, which is not limited here. Figure 6 The third optical modulator 40 in Figure 2 The first optical modulator 20 in FIG. 1 is used for understanding and will not be described in detail here.

[0057] In some embodiments of the present disclosure, reference Figure 6 The optical computing unit 200 further includes a third optical modulator 40. The coupling region 10 of the first waveguide 201 and / or the second waveguide 202 and the coupled resonant cavity optical waveguide 100 is provided with the third optical modulator 40. The third optical modulator 40 is configured to adjust the phase difference of the optical signal in the first waveguide 201 and / or the second waveguide 202 and the coupled resonant cavity optical waveguide 100.

[0058] Figure 7 and Figure 8 is a schematic diagram of the structure of an optional coupling region provided in an embodiment of the present disclosure. It should be noted that: Figure 7 Shows Figure 6 The coupling region 50a in Figure 8 The example is out Figure 6 It should also be noted that more coupling regions may be included between the first waveguide 201 and the coupled resonant cavity optical waveguide 100, and between the second waveguide 202 and the coupled resonant cavity optical waveguide 100, to increase the number of calculations, which is not limited here.

[0059] In the present disclosure, in combination Figure 6 and Figure 7 The third optical modulator 40 is configured to adjust the phase difference of the optical signal in the first waveguide 201 and the coupled resonant cavity optical waveguide 100. In this way, the embodiment of the present disclosure can realize a linear calculation through the third optical modulator 40 and the coupling region 50a between the first waveguide 201 and the coupled resonant cavity optical waveguide 100. Thus, the calculation density and efficiency of the optical calculation unit are further improved.

[0060] It should also be noted that the structure of the third optical modulator can be the same as that of the first optical modulator, and then the first optical modulator and the third optical modulator can be manufactured at the same time, thereby simplifying the manufacturing process and improving the integration.

[0061] In the present disclosure, in combination Figure 6 and Figure 8 The third optical modulator 40 is configured to adjust the phase difference between the optical signal in the second waveguide 202 and the coupled resonant cavity optical waveguide 100. In this way, the embodiment of the present disclosure can implement a linear calculation through the third optical modulator 40 and the coupling region 50b between the second waveguide 202 and the coupled resonant cavity optical waveguide 100. Thus, the calculation density and efficiency of the optical calculation unit are further improved.

[0062] The following multiplication operation is used as an example. Figure 6 The principle of linear calculation performed by the optical calculation unit 200 is described below:

[0063] Figure 6 A multiplication calculation between the first waveguide 201 and the microring MR1 can be shown as formula (3):

[0064]

[0065] After reorganizing the above formula (3), we can get formula (4):

[0066]

[0067] Figure 6 The micro-ring MR1 in the multiplication calculation can be shown as formula (5):

[0068]

[0069] Figure 6 The micro-rings MR1 ​​and MR2 in the multiplication calculation can be shown as formula (6):

[0070]

[0071] After reorganizing the above formula (6), we can get formula (7):

[0072]

[0073] Figure 6 The micro-ring MR2 in the multiplication calculation can be shown as formula (8):

[0074]

[0075] Figure 6A multiplication calculation of the micro-ring MR2 and the second waveguide 202 can be shown as formula (9):

[0076]

[0077] After reorganizing the above formula (9), we can get formula (10):

[0078]

[0079] Combining the above formulas (4), (5), (7), (8), and (10), we can obtain the following formula (11):

[0080]

[0081] It should be noted that t1 in formulas (3), (4) and (11) is the self-coupling coefficient of the part of the first waveguide 201 in the coupling region between the first waveguide 201 and the microring MR1, and k1 in formulas (3), (4) and (11) is the cross-coupling coefficient of the part of the microring MR1 in the coupling region between the first waveguide 201 and the microring MR1. α1 in formulas (5) and (11) is the transmission coefficient of the optical signal in the microring MR1 after passing through the coupling region 10. is the phase change value of the optical signal in microring MR1 after passing through the coupling region 10. In formulas (6), (7) and (11), t2 is the self-coupling coefficient of the partial waveguide of microring MR1 in the coupling region of microring MR1 and MR2. In formulas (6), (7) and (11), k2 is the cross-coupling coefficient of the partial waveguide of microring MR2 in the coupling region of microring MR1 and MR2. In formulas (8) and (11), α2 is the transmission coefficient of the optical signal in microring MR2 after passing through the coupling region 10. In formulas (8) and (11), is the phase change value of the optical signal in the microring MR2 after passing through the coupling region 10. In formulas (9), (10) and (11), t3 is the self-coupling coefficient of the partial waveguide of the microring MR2 in the coupling region between the second waveguide 202 and the microring MR2. In formulas (9), (10) and (11), k3 is the cross-coupling coefficient of the partial waveguide of the second waveguide 202 in the coupling region between the second waveguide 202 and the microring MR2. The sum of the squares of t1 and k1 is 1. The sum of the squares of t2 and k2 is 1. The sum of the squares of t3 and k3 is 1. E1 and E2 are respectively the amplitudes of the optical signal of the microring MR1 on both sides of the coupling region 50a. E3 and E4 are respectively the amplitudes of the optical signal of the microring MR1 on both sides of the coupling region between the microring MR1 and MR2. E5 and E6 are respectively the amplitudes of the optical signal of the microring MR2 on both sides of the coupling region between the microring MR1 and MR2. E7 and E8 are the amplitudes of the optical signals of the micro-ring MR2 at both sides of the coupling region 50b, respectively.

[0082] In the present disclosure, in combination Figure 6 and formula (11), the optical computing unit 200 can control t1, k1, t2, k2, t3 and k3, five multiplication calculations are performed in the two micro-rings MR1 ​​and MR2. Output optical signal E drop Relative to the input optical signal E in , after 5 multiplication operations.

[0083] In some embodiments of the present disclosure, reference Figure 7 The coupling region 20 between the first waveguide 201 and the coupling resonant cavity optical waveguide 100 includes a third coupling region 103 and a fourth coupling region 104. The third coupling region 103 is configured to receive the input optical signal E in The fourth coupling region 104 is configured to combine the first intermediate optical signal and the second intermediate optical signal after the phase difference adjustment.

[0084] In some embodiments of the present disclosure, reference Figure 8 The coupling region 50b between the second waveguide 202 and the coupled resonant cavity optical waveguide 100 includes a fifth coupling region 105 and a sixth coupling region 106. The fifth coupling region 105 is configured to split the optical signal in the microring MR2 coupled by the second waveguide 202 to generate a third intermediate optical signal and a fourth intermediate optical signal. The sixth coupling region 106 is configured to combine the third intermediate optical signal and the fourth intermediate optical signal after the phase difference adjustment is completed.

[0085] Fig. 9 is a schematic diagram of the structure of another optional optical computing unit 200 provided in an embodiment of the present disclosure. It should be noted that: Fig. 9 The illustrated optical computing unit is provided with only one third optical waveguide 203, which is coupled to the microring MR1. The optical computing unit 200 may also be provided with more third optical waveguides, which are coupled to one or more of the remaining microrings MR2-MRn, which is not limited here.

[0086] In some embodiments of the present disclosure, reference Fig. 9 , the optical computing unit 200 further includes a third optical waveguide 203, wherein the third optical waveguide 203 is coupled to any one of the plurality of micro-rings in the coupled resonant cavity optical waveguide 100, and is configured to output the intermediate optical signal generated by the coupled resonant cavity optical waveguide 100. For example, Fig. 9A third optical waveguide 203 is coupled to the microring MR2. In this way, the optical computing unit 200 can output the calculation result of the microring MR2. Therefore, the embodiment of the present disclosure can control the number of calculations of the optical computing unit 200 by selecting the output waveguide.

[0087] Fig.10 is a schematic diagram of an optional optoelectronic computing system 300 provided in an embodiment of the present disclosure, with reference to Fig.10 It should be noted that Fig.10 The illustrated optoelectronic computing unit 200 can be understood with reference to the above-mentioned embodiments, and will not be described in detail here. The control signal driver 302 is respectively connected to the central processor 301 and the optical computing unit 200. The control signal driver 302 is configured to receive and amplify the control signal. The laser 303 is used to generate an input optical signal.

[0088] In some embodiments of the present disclosure, reference Fig.10 The optoelectronic computing system 300 includes a central processing unit 301 and an optical computing unit 200. The central processing unit 301 is communicatively connected to the optical computing unit 200. The central processing unit 301 is configured to input a control signal to the optical computing unit 200. One or more of the first optical modulator, the second optical modulator, and the third optical modulator of the optical computing unit 200 are configured to perform linear calculations on the input optical signal based on the linear weighting coefficient corresponding to the control signal. In this way, the optoelectronic computing system 300 can output a control signal to the optical computing unit 200, and then adjust one or more of the first optical modulator, the second optical modulator, and the third optical modulator in the optical computing unit 200 through the control signal to achieve linear calculations on the input optical signal. In addition, the optoelectronic computing system 300 can choose whether to send a control signal to the first optical modulator, the second optical modulator, and the third optical modulator to determine the number of times the optical computing unit 200 performs linear calculations.

[0089] In some embodiments of the present disclosure, reference Fig.10 The optoelectronic computing system 300 may further include a plurality of optical computing units 200. The plurality of optical computing units 200 may be connected in series or in parallel. Thus, the computing density of the optoelectronic computing system can be further increased.

[0090] The serial numbers of the embodiments of the present disclosure are for description only and do not represent the advantages and disadvantages of the embodiments. The methods disclosed in the several method embodiments provided by the present disclosure can be arbitrarily combined without conflict to obtain new method embodiments. The features disclosed in the several product embodiments provided by the present disclosure can be arbitrarily combined without conflict to obtain new product embodiments. The features disclosed in the several method or device embodiments provided by the present disclosure can be arbitrarily combined without conflict to obtain new method embodiments or device embodiments.

[0091] The above description is only a specific implementation mode of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure.

Claims

1. A coupled resonant cavity optical waveguide for optical computing, characterized in that: include: A plurality of micro-rings and a plurality of first optical modulators arranged in sequence; wherein, Every two adjacent micro-rings are coupled to each other; the first optical modulator is arranged in the coupling region between every two adjacent micro-rings; Each of the first optical modulators is configured to adjust the phase difference of the optical signals in two adjacent micro-rings; The coupling region between each two adjacent micro-rings includes: a first coupling region and a second coupling region; wherein, The first coupling region is configured to split the optical signal of one of the two adjacent micro-rings; The second coupling region is configured to combine the optical signals whose phase differences have been adjusted in two adjacent micro-rings.

2. The coupled resonant cavity optical waveguide according to claim 1, characterized in that: The coupled resonant cavity optical waveguide further includes: a plurality of second optical modulators; wherein, Each of the second optical modulators is disposed on a corresponding one of the micro-rings and is configured to adjust the round-trip transmission coefficient and / or round-trip phase shift of the micro-ring.

3. The coupled resonant cavity optical waveguide according to claim 2, characterized in that: Each of the first optical modulators comprises: a first electrode and a second electrode; wherein, The first electrode and the second electrode are respectively arranged on two adjacent micro-rings, and are respectively configured to adjust the phase of the optical signal in the corresponding micro-ring.

4. The coupled resonant cavity optical waveguide according to claim 2, characterized in that: The structures of the plurality of first optical modulators and the plurality of second optical modulators are the same.

5. An optical computing unit, characterized in that: include: The first waveguide, the second waveguide and the coupled resonant cavity optical waveguide according to any one of claims 1 to 4; wherein, The first waveguide is configured to receive an input optical signal; The coupled resonant cavity optical waveguide is coupled to the first waveguide and is configured to perform a linear calculation on the input optical signal to generate an output optical signal; The second waveguide, coupled to the coupled resonant cavity optical waveguide, is configured to output the output optical signal.

6. The optical computing unit according to claim 5, characterized in that The optical computing unit further includes: a third optical modulator; wherein, The third optical modulator is provided in the coupling region between the first waveguide and / or the second waveguide and the coupled resonant cavity optical waveguide; The third optical modulator is configured to adjust the phase difference between the optical signals in the first waveguide and / or the second waveguide and the coupled resonant cavity optical waveguide.

7. The optical computing unit according to claim 6, characterized in that The coupling region between the first waveguide and the coupled resonant cavity optical waveguide includes: a third coupling region and a fourth coupling region; and / or, the coupling region between the second waveguide and the coupled resonant cavity optical waveguide includes: a fifth coupling region and a sixth coupling region; wherein, The third coupling region is configured to split the input optical signal to generate a first intermediate optical signal and a second intermediate optical signal; The fourth coupling region is configured to combine the first intermediate optical signal and the second intermediate optical signal after the phase difference adjustment is completed; The fifth coupling region is configured to split the optical signal in the microring coupled with the second waveguide to generate a third intermediate optical signal and a fourth intermediate optical signal; The sixth coupling region is configured to combine the third intermediate optical signal and the fourth intermediate optical signal after the phase difference adjustment.

8. The optical computing unit according to claim 5, characterized in that The optical computing unit further includes: a third optical waveguide; wherein, The third optical waveguide is coupled to any one of the plurality of micro-rings in the coupled resonant cavity optical waveguide, and is configured to output an intermediate optical signal generated by the coupled resonant cavity optical waveguide.

9. The optical computing unit according to claim 5, characterized in that The first waveguide and the second waveguide are parallel to each other; wherein, The two micro-rings located at the head and the end of the coupled resonant cavity optical waveguide are coupled to the first waveguide and the second waveguide respectively.

10. An optoelectronic computing system, characterized in that: include: A central processing unit and an optical computing unit as claimed in any one of claims 5 to 9; The central processor is communicatively connected to the optical computing unit and is configured to input a control signal to the optical computing unit; One or more of the first optical modulator, the second optical modulator and the third optical modulator of the optical computing unit is configured to perform linear computing on the input optical signal based on a linear weighting coefficient corresponding to the control signal.

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