Optical Signal Replication Device

Abstract

Embodiments of the present application disclose an optical signal replication device and an optical parametric amplifier, which are applied to the communication field. In the embodiments of the present application, the optical signal replication device included in the optical parametric amplifier generates an invalid signal during the process of transmitting the signal light and the pump light. The optical signal replication device can separate the signal light from the invalid signal and then transmit it to the signal processing module. In this way, the signal processing module can directly process the signal light that does not include the invalid signal, and the invalid signal will not occupy the transmission bandwidth of the optical parametric amplifier, so the effective transmission bandwidth of the optical parametric amplifier is relatively large.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of wireless communication, and in particular, to an optical signal copying device. Background Art

[0002] An optical parametric amplifier is an amplifier that can amplify optical signals in an optical fiber communication system. An optical parametric amplifier is a device that can directly amplify optical signals without converting optical signals into electrical signals. The principle of an optical parametric amplifier is based on the stimulated emission of lasers, and amplification is achieved by converting the energy of pump light into the energy of signal light.

[0003] An optical signal copying device is a device for preprocessing optical signals in an optical parametric amplifier. A pump laser transmits pump light to the optical signal copying device, and a transmitter transmits signal light to the optical signal copying device. In this way, the optical signal copying device can transmit the pump light and the signal light to a signal processing module included in the optical parametric amplifier. However, invalid signals are generated during the transmission of the pump light and the signal light in the optical signal copying device, and the optical signal copying device will transmit the pump light, the signal light, and the invalid signals to the signal processing module.

[0004] The optical signal copying device sends the pump light, the signal light, and the invalid signals to the signal processing module. The invalid signals occupy the transmission bandwidth of the optical parametric amplifier, and the effective transmission bandwidth of the optical parametric amplifier is small. Summary of the Invention

[0005] Embodiments of the present application provide an optical signal copying device and an optical parametric amplifier. The optical signal copying device can separate the signal light from the invalid signals and then transmit them to the signal processing module, which can improve the effective transmission bandwidth of the optical parametric amplifier.

[0006] The first aspect of the present application provides an optical signal replication device, which includes: a first coupler, a second coupler, a first nonlinear medium, a second nonlinear medium, and a first phase shifter; the first end of the first coupler is connected to a pump laser, the second end is connected to a transmitter, the third end is connected to the first end of the first nonlinear medium, and the fourth end is connected to the first end of the first phase shifter; the second end of the first nonlinear medium is connected to the first end of the second coupler; the second end of the first phase shifter is connected to the first end of the second nonlinear medium; the second end of the second nonlinear medium is connected to the second end of the second coupler; the first end of the first coupler introduces the first pump light emitted by the pump laser, the second end of the first coupler receives the first signal light emitted by the transmitter, after the first coupler couples the first pump light and the first signal light in a first ratio, the third end of the first coupler outputs a second pump light and a second signal light to the first nonlinear medium, and the fourth end of the first coupler outputs a third pump light and a third signal light to the first phase shifter; after the first nonlinear medium receives the second pump light and the second signal light, the second pump light and the second signal light generate a first ineffective signal after a three-wave mixing effect or a four-wave mixing effect occurs in the first nonlinear medium; after the first phase shifter receives the third pump light and the third signal light, the first phase shifter generates a fourth pump light after adding a first phase shift to the third pump light; after the second nonlinear medium receives the fourth pump light and the third signal light, the fourth pump light and the third signal light generate a second ineffective signal after a three-wave mixing effect or a four-wave mixing effect occurs in the second nonlinear medium; the first end of the second coupler inputs the second pump light, the second signal light, and the first ineffective signal output by the first nonlinear medium, the second end of the second coupler inputs the fourth pump light, the third signal light, and the second ineffective signal, and the second coupler couples the optical signals input at the first end and the second end of the second coupler in a second ratio; after the second coupler couples the optical signals input at the first end and the second end of the second coupler in a ratio, the first ineffective signal and the second ineffective signal interfere with each other and cancel each other out at the third end of the second coupler, the second signal light and the third signal light undergo constructive interference at the third end of the second coupler, and the third end of the second coupler outputs the signal light generated after constructive interference.

[0007] In the embodiments of the present application, an optical signal replication device included in an optical parametric amplifier will generate an invalid signal during the process of transmitting the signal light and the pump light. The optical signal replication device can separate the signal light from the invalid signal and then transmit it to the signal processing module. In this way, the signal processing module can directly process the signal light that does not include the invalid signal, and the invalid signal will not occupy the transmission bandwidth of the optical parametric amplifier, and the effective transmission bandwidth of the optical parametric amplifier is relatively large.

[0008] In a possible implementation manner of the first aspect, for the above optical signal replication device: the first phase shift amount is 2πi, where i is a positive integer greater than zero, the first invalid signal is the first crosstalk signal, and the second invalid signal is the second crosstalk signal.

[0009] In this possible implementation manner, after the second pump light and the second signal light are introduced into the first nonlinear medium, the second pump light and the second signal light will generate a three-wave mixing effect or a four-wave mixing effect in the first nonlinear medium. After the second pump light and the second signal light generate a three-wave mixing effect or a four-wave mixing effect, the first crosstalk signal will be generated; after the third pump light and the third signal light are introduced into the first phase shifter, the first phase shifter increases the phase of the third pump light by 2πi to generate the fourth pump light; after the fourth pump light and the third signal light are introduced into the second nonlinear medium, the fourth pump light and the third signal light will generate a three-wave mixing effect or a four-wave mixing effect in the second nonlinear medium. After the fourth pump light and the third signal light generate a three-wave mixing effect or a four-wave mixing effect, the second crosstalk signal will be generated; after the second coupler couples the optical signals input at the first end and the second end of the second coupler in proportion, the first crosstalk signal and the second crosstalk signal interfere with each other and cancel each other out at the third end of the second coupler, and the second signal light and the third signal light have constructive interference at the third end of the second coupler, and the signal light generated after the constructive interference is output at the third end of the second coupler. In this possible implementation manner, the optical signal replication device realizes the separation between the signal light and the crosstalk signal. In this way, the signal processing module can directly process the signal light that does not contain the crosstalk signal, and the crosstalk signal will not occupy the transmission bandwidth of the optical parametric amplifier, and the effective transmission bandwidth of the optical parametric amplifier is relatively large.

[0010] In a possible implementation manner of the first aspect, for the above optical signal replication device: the first phase shift amount is π / 2 + πi, where i is a positive integer greater than zero, the first invalid signal is the first idler light, and the second invalid signal is the second idler light.

[0011] In this possible implementation, after the second pump light and the second signal light are introduced into the first nonlinear medium, the second pump light and the second signal light will undergo a three-wave mixing effect or a four-wave mixing effect in the first nonlinear medium, and a first idler light will be generated after the second pump light and the second signal light undergo the three-wave mixing effect or the four-wave mixing effect; after the third pump light and the third signal light are introduced into the first phase shifter, the first phase shifter increases the phase of the third pump light by π / 2 + πi to generate a fourth pump light; after the fourth pump light and the third signal light are introduced into the second nonlinear medium, the fourth pump light and the third signal light will undergo a three-wave mixing effect or a four-wave mixing effect in the second nonlinear medium, and a second idler light will be generated after the fourth pump light and the third signal light undergo the three-wave mixing effect or the four-wave mixing effect; after the second coupler couples the optical signals input to the first end and the second end of the second coupler proportionally, the first idler light and the second idler light interfere with each other and cancel each other out at the third end of the second coupler, and the second signal light and the third signal light undergo constructive interference at the third end of the second coupler, and the signal light generated after the constructive interference at the third end of the second coupler is output. The optical signal replication device realizes the separation between the signal light and the idler light. In this way, the signal processing module can directly process the signal light without the idler light, and the idler light will not occupy the transmission bandwidth of the optical parametric amplifier, and the effective transmission bandwidth of the optical parametric amplifier is relatively large.

[0012] In a possible implementation of the first aspect, the above optical signal replication device: the optical signal replication device further includes a second phase shifter; the first end of the second phase shifter is connected to the second nonlinear medium; the second end of the second phase shifter is connected to the second end of the second coupler; after the fourth pump light, the third signal light, and the second ineffective signal are introduced into the second phase shifter, the second phase shifter increases the phase of the fourth pump light by a second phase shift amount to generate a fifth pump light, and the second end of the second phase shifter transmits the fifth pump light to the second end of the second coupler.

[0013] In this possible implementation, the optical signal replication device includes a second phase shifter, and the operator can control the output position of the pump light in the optical signal replication device by changing the second phase shift amount of the second phase shifter. This possible implementation improves the accuracy of the optical signal replication device.

[0014] In a possible implementation of the first aspect, the above optical signal replication device: the first ratio is 1:1; after the first coupler couples the first pump light and the first signal light in a ratio of 1:1, the third end of the first coupler outputs the second pump light and the second signal light to the first nonlinear medium. The signal intensity of the second pump light is 50% of the signal intensity of the first pump light. The phase difference between the second pump light and the first pump light is π / 2. The signal intensity of the second signal light is 50% of the signal intensity of the first signal light. The second signal light has the same phase as the first signal light; the fourth end of the first coupler outputs the third pump light and the third signal light to the second nonlinear medium. The signal intensity of the third pump light is 50% of the signal intensity of the first pump light. The third pump light has the same phase as the first pump light. The signal intensity of the third signal light is 50% of the signal intensity of the first signal light. The phase difference between the third signal light and the first signal light is π / 2.

[0015] In this possible implementation, the coupling ratio of the first coupler included in the optical signal replication device is 1:1, which improves the feasibility of the solution.

[0016] In a possible implementation of the first aspect, the above optical signal replication device: the optical signal replication device further includes a second phase shifter; the first end of the second phase shifter is connected to the second nonlinear medium; the second end of the second phase shifter is connected to the second end of the second coupler; after receiving the fourth pump light, the third signal light, and the second invalid signal, the second phase shifter increases the phase of the fourth pump light by a second phase shift amount to generate a fifth pump light, and the second end of the second phase shifter transmits the fifth pump light to the second end of the second coupler.

[0017] In this possible implementation, when the second phase shift amount is 2πi, the pump light will be exported from the fourth end of the second coupler of the optical signal replication device. In this way, the separation between the signal light and the pump light can be achieved, which improves the accuracy of the optical signal replication device.

[0018] In a possible implementation of the first aspect, the above optical signal replication device: the second phase shift amount is π + 2πi, where i is a positive integer greater than zero; the first end of the second coupler receives the third pump light, the second end of the second coupler receives the fifth pump light, the third pump light and the fifth pump light cancel each other out after interfering at the fourth end of the second coupler, the third pump light and the fifth pump light undergo constructive interference at the third end of the second coupler, and the second coupler outputs the pump light generated after constructive interference from its third end.

[0019] In this possible implementation, when the first phase shift amount is π + 2πi, the pump light will be output from the third end of the second coupler of the optical signal replication device. This possible implementation improves the feasibility of the solution.

[0020] The second aspect of the present application provides an optical signal replication device, which includes: a first circulator, a second circulator, a third coupler, a third phase shifter, and a third nonlinear medium; the first end of the first circulator is connected to a transmitter, the second end is connected to the first end of the third coupler, and the third end is connected to a third attenuator; the first end of the second circulator is connected to a pump laser, the second end is connected to the second end of the second coupler, and the second end is connected to a fourth attenuator; the third end of the third coupler is connected to the first end of the third phase shifter, and the fourth end of the third coupler is connected to the first end of the third nonlinear medium; the second end of the third phase shifter is connected to the second end of the nonlinear medium; after the first end of the first circulator receives the fourth signal light emitted by the transmitter, the second end of the first circulator outputs the fourth signal light to the first end of the third coupler; after the first end of the second circulator receives the sixth pump light emitted by the pump laser, the second end of the second circulator outputs the sixth pump light to the second end of the third coupler; the first end of the third coupler receives the fourth signal light derived from the second end of the first circulator, the second end of the third coupler receives the sixth pump light emitted by the second end of the second circulator, after the third coupler couples the fourth signal light and the sixth pump light proportionally, the third end of the third coupler outputs the fifth signal light and the seventh pump light to the first end of the third phase shifter, and the fourth end of the third coupler outputs the sixth signal light and the eighth pump light to the first end of the third nonlinear medium; when the optical signal is transmitted counterclockwise in the optical signal replication device, after the first end of the third phase shifter receives the fifth signal light and the seventh pump light, the third phase shifter generates the ninth pump light after adding a third phase shift amount to the seventh pump light, and the second end of the third phase shifter outputs the fifth signal light and the ninth pump light to the third nonlinear medium; after the second end of the third nonlinear medium receives the fifth signal light and the ninth pump light; the fifth signal light and the ninth pump light undergo a three-wave mixing effect or a four-wave mixing effect in the third nonlinear medium, and a third invalid signal will be generated after the fifth signal light and the ninth pump light undergo the three-wave mixing effect or the four-wave mixing effect, and the first end of the third nonlinear medium will input the fifth signal light, the ninth pump light, and the third invalid signal to the fourth end of the third coupler;When the optical signal is transmitted clockwise in the optical signal replication device, after the first end of the third nonlinear medium receives the sixth signal light and the eighth pump light, the sixth signal light and the eighth pump light generate a three-wave mixing effect or a four-wave mixing effect in the third nonlinear medium. After the sixth signal light and the eighth pump light generate a three-wave mixing effect or a four-wave mixing effect, a fourth invalid signal will be generated. The second end of the third nonlinear medium will input the sixth signal light, the eighth pump light, and the fourth invalid signal to the second end of the third phase shifter; the second end of the third phase shifter receives the sixth signal light, the eighth pump light, and the fourth invalid signal. The third phase shifter generates a tenth pump light after increasing the fourth phase shift amount for the eighth pump light. The first end of the third phase shifter will input the sixth signal light, the tenth pump light, and the fourth invalid signal to the third end of the third coupler; after the third coupler couples the optical signals received at the third end and the fourth end in proportion, the third invalid signal and the fourth invalid signal interfere with each other and cancel each other out at the first end of the third coupler. The fifth signal light and the sixth signal light generate constructive interference. The first end of the third coupler outputs the signal light after constructive interference to the second end of the first circulator. The second end of the third coupler outputs the pump light after constructive interference and the invalid signal after constructive interference; after the second end of the first circulator receives the signal light after constructive interference, the third end of the first circulator will output the signal light after constructive interference to the third attenuator.

[0021] In the embodiments of the present application, the optical signal replication device included in the optical parametric amplifier will generate invalid signals during the process of transmitting the signal light and the pump light. The optical signal replication device can separate the signal light and the invalid signal and then transmit them to the signal processing module. In this way, the signal processing module can directly process the signal light that does not include the invalid signal, and the invalid signal will not occupy the transmission bandwidth of the optical parametric amplifier, and the effective transmission bandwidth of the optical parametric amplifier is relatively large.

[0022] In a second possible implementation manner of the second aspect, for the above optical signal replication device: the second phase shift amount is 2πi, where i is a positive integer greater than zero, the third invalid signal is a third crosstalk signal, and the fourth invalid signal is a fourth crosstalk signal.

[0023] In this possible implementation manner, when the third phase shift amount is 2πi, the optical signal replication device realizes the separation between the signal light and the crosstalk signal. In this way, the signal processing module can directly process the signal light that does not contain the crosstalk signal, and the crosstalk signal will not occupy the transmission bandwidth of the optical parametric amplifier, and the effective transmission bandwidth of the optical parametric amplifier is relatively large.

[0024] In a possible implementation of the second aspect, the above optical signal replication device: the third phase shift amount is π / 2 + 2πi, where i is a positive integer greater than zero, the third ineffective signal is the third idler light, and the fourth ineffective signal is the fourth idler light.

[0025] In this possible implementation, when the third phase shift amount is π / 2 + 2πi, the optical signal replication device realizes the separation between the signal light and the idler light. In this way, the signal processing module can directly process the signal light without the idler light, and the idler light will not occupy the transmission bandwidth of the optical parametric amplifier, so the effective transmission bandwidth of the optical parametric amplifier is relatively large.

[0026] In a possible implementation of the second aspect, the above optical signal replication device: the third ratio is 1:1; after the third coupler couples the fourth signal light and the sixth pump light in a ratio of 1:1, the third end of the third coupler outputs the fifth signal light and the seventh pump light to the first end of the third phase shifter. The signal intensity of the fifth signal light is 50% of the signal intensity of the fourth signal light, the fifth signal light has the same phase as the fourth signal light, the signal intensity of the seventh pump light is 50% of the signal intensity of the sixth pump light, and the phase difference between the seventh pump light and the sixth pump light is π / 2; the fourth end of the third coupler outputs the sixth signal light and the eighth pump light to the first end of the third nonlinear medium. The signal intensity of the sixth signal light is 50% of the signal intensity of the fourth signal light, the phase difference between the sixth signal light and the fourth signal light is π / 2, the signal intensity of the eighth pump light is 50% of the signal intensity of the sixth pump light, and the eighth pump light has the same phase as the sixth pump light.

[0027] In this possible implementation, the coupling ratio of the third coupler included in the optical signal replication device is 1:1, which improves the feasibility of the solution. The third aspect of the present application provides an optical parametric amplifier, which includes: an optical signal replication device, a signal processing device, and a signal amplification device. The signal processing device is used to process the optical signal output by the optical signal replication device. The signal processing device includes a first attenuator and a second attenuator. The signal amplification device is used to amplify the optical signal processed by the signal processing device. The optical signal replication device is the optical signal replication device described in the first aspect or any possible implementation of the first aspect.

[0028] The fourth aspect of the present application provides an optical parametric amplifier, which includes an optical signal replication device, a signal processing device, and a signal amplification device. The signal processing device is used to process the optical signal output by the optical signal replication device. The signal processing device includes a first attenuator and a second attenuator. The signal amplification device is used to amplify the optical signal processed by the signal processing device. The optical signal replication device is the optical signal replication device described in the second aspect or any possible implementation manner of the second aspect above.

[0029] As can be seen from the above technical solutions, the embodiments of the present application have the following advantages:

[0030] In the embodiments of the present application, the optical signal replication device included in the optical parametric amplifier will generate invalid signals during the process of transmitting the signal light and the pump light. The optical signal replication device can separate the signal light from the invalid signals and then transmit them to the signal processing module. In this way, the signal processing module can directly process the signal light that does not include invalid signals, and the invalid signals will not occupy the transmission bandwidth of the optical parametric amplifier, so the effective transmission bandwidth of the optical parametric amplifier is relatively large. Description of the Drawings

[0031] Figure 1 is a schematic structural diagram of the optical parametric amplifier provided by the embodiments of the present application;

[0032] Figure 2 is a schematic diagram of an embodiment of an optical signal replication device provided by the embodiments of the present application;

[0033] Figure 3 is a schematic diagram of another embodiment of an optical signal replication device provided by the embodiments of the present application;

[0034] Figure 4 is a schematic diagram of another embodiment of an optical signal replication device provided by the embodiments of the present application;

[0035] Figure 5 is a schematic diagram of another embodiment of an optical signal replication device provided by the embodiments of the present application. Detailed Embodiments

[0036] The following describes the embodiments of the present application with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Those of ordinary skill in the art can know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0037] In the description, claims, and above-mentioned drawings of this application, terms such as "first" and "second" are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order different from that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0038] The optical signal replication device is connected to the signal transmission device. The signal transmission device is a device that provides an optical signal to the optical parametric amplifier. The signal transmission device includes a pump laser and a transmitter. The pump laser transmits pump light to the optical signal replication device, and the transmitter transmits signal light to the optical signal replication device. In this way, the replication device can transmit the pump light and the signal light to the signal processing device included in the optical parametric amplifier, and the signal processing device is the signal processing module in the optical parametric amplifier. However, invalid signals will be generated during the transmission of the pump light and the signal light in the optical signal replication device, and the optical signal replication device will transmit the pump light, the signal light, and the invalid signals to the signal processing device.

[0039] The optical signal replication device sends the pump light, the signal light, and the invalid signals to the signal processing device. The invalid signals will occupy the transmission bandwidth of the signal processing device, and further, the invalid signals will occupy the transmission bandwidth of the signal amplification device. From the overall perspective of the optical parametric amplifier, in this way, the invalid signals occupy the transmission bandwidth of the optical parametric amplifier, and the effective transmission bandwidth of the optical parametric amplifier is small.

[0040] In view of the above problems existing in the existing optical parametric amplifier, the embodiments of this application provide an optical signal replication device and a related optical parametric amplifier, which can increase the effective transmission bandwidth of the optical parametric amplifier.

[0041] Figure 1 It is a schematic structural diagram of the optical parametric amplifier provided by the embodiment of this application.

[0042] Please refer to Figure 1 as Figure 1 shown, the optical parametric amplifier 100 provided by the embodiment of this application includes: an optical signal replication module 101, a signal processing module 102, and a signal amplification module 103.

[0043] Among them, the optical signal replication module 101 is connected to the signal processing module 102, and the signal processing module 102 is connected to the signal amplification module 103.

[0044] The optical signal replication module is a module for processing optical signals in an optical parametric amplifier, that is, an optical signal replication device. The optical signal replication device is the pre-stage structure of the signal amplification device. The optical signal replication device is usually composed of a first-order phase-insensitive optical parametric amplifier (PIA). Its main function is to generate optical signals that meet the requirements of the signal processing module and the signal amplification module.

[0045] In the embodiments of the present application, it can be understood that the optical signal replication module mentioned in the embodiments of the present application can be applied to any scenario that needs to perform signal processing. Specifically, it can be applied to an optical parametric amplifier, and the optical parametric amplifier can be a phase-sensitive amplifier (PSA).

[0046] The signal processing module is a module for processing signal optical signals in an optical parametric amplifier. After receiving the optical signal sent by the optical signal replication module, the signal processing module can process the received optical signal. Optionally, the signal processing methods include power equalization, phase control, polarization control, and other signal processing methods, which are not specifically limited here.

[0047] The signal amplification module is used to amplify the optical signal.

[0048] Based on Figure 1 the structural schematic diagram of the optical parametric amplifier described above, the optical signal replication device provided in the embodiments of the present application is described.

[0049] Figure 2 It is a schematic diagram of an embodiment of an optical signal replication device provided in the embodiments of the present application.

[0050] Please refer to Figure 2 As Figure 2 shown, the optical signal replication device mentioned in the embodiments of the present application includes: a first coupler, a second coupler, a first nonlinear medium, a second nonlinear medium, and a first phase shifter.

[0051] In the embodiments of the present application, the nonlinear medium mentioned has a large nonlinear coefficient and small dispersion. Optionally, the nonlinear medium provided in the embodiments of the present application can be a highly nonlinear fiber (HNLF), a photonic crystal fiber (PCF), or other types of nonlinear media such as a periodically poled lithium niobate waveguide (PPLN), which are not specifically limited here.

[0052] In the embodiments of the present application, the phase shifter mentioned refers to an element used to change the phase of the transmitted wave in a microwave circuit. Optionally, the phase shifter mentioned in the embodiments of the present application may be a fiber Bragg grating (FBG), an electro-optic modulator, or an acousto-optic modulator, etc. Other types of phase shifters are not specifically limited here.

[0053] In the embodiments of the present application, the first end of the first coupler is connected to the pump laser, the second end is connected to the transmitter, the third end is connected to the first end of the first nonlinear medium, and the fourth end is connected to the first end of the first phase shifter.

[0054] The coupler mentioned in the embodiments of the present application is an optical fiber coupler. An optical fiber coupler, also known as a splitter, connector, and adapter, is an element used to realize the splitting or combining of optical signals. It is applied in various transmission networks such as telecommunication networks, cable TV networks, and local area networks.

[0055] The second end of the first nonlinear medium is connected to the first end of the second coupler.

[0056] The second end of the first phase shifter is connected to the first end of the second nonlinear medium.

[0057] The second end of the second nonlinear medium is connected to the second end of the second coupler.

[0058] The third end of the second coupler is connected to the first attenuator, and the fourth end of the second coupler is connected to the second attenuator.

[0059] In the embodiments of the present application, the optical signal replication device in the optical parametric amplifier is connected to the signal processing module. Optionally, the signal processing module includes the first attenuator and the second attenuator. The signal processing module may also include other components, which are not specifically limited here.

[0060] In the embodiments of the present application, the first end of the first coupler receives the first pump light emitted by the pump laser, and the second end of the first coupler receives the first signal light emitted by the transmitter. After the first coupler couples the first pump light and the first signal light in proportion, the third end of the first coupler outputs the second pump light and the second signal light to the first nonlinear medium, and the fourth end of the first coupler outputs the third pump light and the third signal light to the first phase shifter.

[0061] In the embodiments of the present application, the first coupler couples the first pump light and the first signal light in a certain proportion. Specifically, the coupling proportion may be in a 1:1 manner.

[0062] After the third coupler couples the fourth signal light and the sixth pump light in a 1:1 ratio, the third end of the third coupler outputs the fifth signal light and the seventh pump light to the first end of the third phase shifter. The signal intensity of the fifth signal light is 50% of the signal intensity of the fourth signal light. The fifth signal light has the same phase as the fourth signal light. The signal intensity of the seventh pump light is 50% of the signal intensity of the sixth pump light. The phase difference between the seventh pump light and the sixth pump light is π / 2.

[0063] The fourth end of the third coupler outputs the sixth signal light and the eighth pump light to the first end of the third nonlinear medium. The signal intensity of the sixth signal light is 50% of the signal intensity of the fourth signal light. The phase difference between the sixth signal light and the fourth signal light is π / 2. The signal intensity of the eighth pump light is 50% of the signal intensity of the sixth pump light. The eighth pump light has the same phase as the sixth pump light.

[0064] In the embodiments of the present application, the optical signal replication device is connected to the transmitting device, and the transmitting device is a device that generates optical signals. Optionally, the transmitting device may include a pump laser and a transmitter. The transmitting device may also include other optical signal-related components, which are not specifically limited here.

[0065] After the second pump light and the second signal light are received in the first nonlinear medium, the second pump light and the second signal light generate a first ineffective signal after undergoing a three-wave mixing effect or a four-wave mixing effect in the first nonlinear medium.

[0066] In the embodiments of the present application, optionally, the first ineffective signal may be a crosstalk signal, and the first ineffective signal may also be an idler light, which is not specifically limited here.

[0067] In the embodiments of the present application, optionally, the second pump light and the second signal light may undergo a three-wave mixing effect or a four-wave mixing effect in the first nonlinear medium. Which effect occurs specifically is determined by the type of the nonlinear medium.

[0068] After the third pump light and the third signal light are received in the first phase shifter, the first phase shifter adds a first phase shift to the third pump light to generate the fourth pump light.

[0069] After the fourth pump light and the third signal light are received in the second nonlinear medium, the fourth pump light and the third signal light will undergo a three-wave mixing effect or a four-wave mixing effect in the second nonlinear medium. After the fourth pump light and the third signal light undergo a three-wave mixing effect or a four-wave mixing effect, a second ineffective signal will be generated.

[0070] In an embodiment of the present application, optionally, the second invalid signal may be a crosstalk signal, or the second invalid signal may also be idle optical light. Specifically, no limitation is imposed herein.

[0071] In an embodiment of the present application, optionally, the fourth pump light and the third signal light may generate a three-wave mixing effect or a four-wave mixing effect in the second nonlinear medium. Which effect specifically occurs is determined by the type of the nonlinear medium.

[0072] The second coupler inputs the second pump light, the second signal light, and the first invalid signal at the first end, and inputs the fourth pump light, the second signal light, and the second invalid signal at the second end. The second coupler couples the transmission signals input at the first end and the second end of the second coupler in proportion.

[0073] In an embodiment of the present application, the second coupler couples the optical signals input at the first end and the second end of the second coupler in a certain proportion. Specifically, the coupling proportion may be a 1:1 coupling method.

[0074] After the second coupler couples the transmission signals input at the first end and the second end of the second coupler in proportion, the first invalid signal and the second invalid signal interfere with each other and cancel each other out at the third end of the second coupler. The second signal light and the third signal light undergo constructive interference at the third end of the second coupler, and the second coupler outputs the signal light generated after the constructive interference.

[0075] In an embodiment of the present application, optionally, when the first phase shift amount is 2πi, where i is a positive integer greater than zero. After the second pump light and the second signal light are received in the first nonlinear medium, the second pump light and the second signal light will generate a three-wave mixing effect or a four-wave mixing effect in the first nonlinear medium. After the second pump light and the second signal light generate a three-wave mixing effect or a four-wave mixing effect, a first crosstalk signal will be generated.

[0076] After the third pump light and the third signal light are received in the first phase shifter, the first phase shifter increases the phase of the third pump light by 2πi to generate the fourth pump light.

[0077] After the fourth pump light and the third signal light are received in the second nonlinear medium, the fourth pump light and the third signal light will generate a three-wave mixing effect or a four-wave mixing effect in the second nonlinear medium. After the fourth pump light and the third signal light generate a three-wave mixing effect or a four-wave mixing effect, a second crosstalk signal will be generated.

[0078] The first invalid signal is the first crosstalk signal, and the second invalid signal is the second crosstalk signal. The first crosstalk signal and the second crosstalk signal will cancel each other out after interfering at the third end of the first coupler, thereby achieving the separation between the signal light and the crosstalk signal in the signal output by the replication device.

[0079] In an embodiment of the present application, optionally, when the first phase shift amount is π / 2 + πi, where i is a positive integer greater than zero. The first invalid signal is the first idler light, and the second invalid signal is the second idler light. The first idler light and the second idler light will cancel each other out after interfering at the third end of the first coupler, thereby achieving the separation between the signal light and the idler light in the signal output by the optical signal replication device.

[0080] In an embodiment of the present application, during the process of transmitting the signal light and the pump light in the optical signal replication device included in the optical parametric amplifier, invalid signals will be generated. The optical signal replication device can separate the signal light from the invalid signals and then transmit them to the signal processing module. In this way, the signal processing module can directly process the signal light that does not include invalid signals, and the invalid signals will not occupy the transmission bandwidth of the optical parametric amplifier, so the effective transmission bandwidth of the optical parametric amplifier is relatively large.

[0081] Figure 3 It is a schematic diagram of an embodiment of an optical signal replication device provided by an embodiment of the present application.

[0082] Please refer to Figure 3 , based on the optical signal replication device as described in the above embodiment as Figure 2 shown, the optical signal replication device provided in this embodiment may further include a second phase shifter.

[0083] The first end of the second phase shifter is connected to the second nonlinear medium.

[0084] The second end of the second phase shifter is connected to the second end of the second coupler.

[0085] After receiving the fourth pump light, the third signal light, and the second invalid signal, the second phase shifter increases the phase of the fourth pump light by a second phase shift amount to generate a fifth pump light. The second end of the second phase shifter transmits the fifth pump light to the second end of the second coupler.

[0086] In the embodiment of the present application, when the second phase shift amount is 2πi, where i is a positive integer greater than zero. The first end of the second coupler receives the third pump light, and the second end of the second coupler receives the fifth pump light. The third pump light and the fifth pump light cancel each other out after interfering at the third end of the second coupler, and the third pump light and the fifth pump light undergo constructive interference at the fourth end of the second coupler. The fourth end of the second coupler outputs the pump light generated after constructive interference. The third end of the second coupler outputs the signal light, and the fourth end of the second coupler outputs the pump light, so that the separation between the pump light and the signal light can be achieved.

[0087] In the embodiment of the present application, when the second phase shift amount is π + 2πi, where i is a positive integer greater than zero. The first end of the second coupler receives the third pump light, and the second end of the second coupler receives the fifth pump light. The third pump light and the fifth pump light cancel each other out after interfering at the fourth end of the second coupler, and the third pump light and the fifth pump light undergo constructive interference at the third end of the second coupler. The third end of the second coupler outputs the pump light generated after constructive interference. The embodiment of the present application can control the second phase shift amount applied to the pump light by the second phase shifter, and further control the output of the pump light from the third end of the second coupler together with the signal light.

[0088] In the embodiment of the present application, the optical signal replication device included in the optical parametric amplifier will generate invalid signals during the transmission of the signal light and the pump light. The optical signal replication device can separate the signal light from the invalid signals and then transmit them to the signal processing module. In this way, the signal processing module can directly process the signal light that does not include the invalid signals, and the invalid signals will not occupy the transmission bandwidth of the optical parametric amplifier, and the effective transmission bandwidth of the optical parametric amplifier is relatively large.

[0089] Figure 4 It is a schematic diagram of an embodiment of an optical signal replication device provided by the embodiment of the present application.

[0090] Please refer to Figure 4 , the transmission process of the optical signal in the optical signal replication device will be described in detail in the following embodiments.

[0091] Exemplarily, in the embodiment of the present application, as shown in the following figure, P is the phase of the pump light, S is the phase of the signal light, I is the phase of the idler light, and XT is the phase of the crosstalk signal.

[0092] The phase of the first pump light input at the first end of the first coupler is φ p , the phase of the first signal light input at the second end of the first coupler is φ s , after being coupled by the first coupler, the phase of the second pump light output at the third end of the first coupler is φ p , and the phase of the second signal light is φ s+π / 2, the phase of the third pump light output from the fourth end of the first coupler is φ p +π / 2, the phase of the third signal light is φ s 。

[0093] The first phase shifter adds a first phase shift amount Δφ to the third pump light p (1) After that, the fourth pump light is generated, and the phase of the fourth pump light is φ p +π / 2 + Δφ p (1).

[0094] The second pump light and the second signal light are input into the first nonlinear medium. After the three-wave mixing or four-wave mixing effect occurs in the first nonlinear medium, an idler light and a crosstalk signal will be generated. According to the formula for generating the idler light in the nonlinear medium, the phase of the first idler light is 2φ p -φ s , according to the formula for generating the crosstalk signal in the nonlinear medium, the phase of the first crosstalk signal is φ p +π / 2.

[0095] The fourth pump light and the third signal light are input into the second nonlinear medium. After the three-wave mixing or four-wave mixing effect occurs in the second nonlinear medium, an idler light and a crosstalk signal will be generated. According to the formula for generating the idler light in the nonlinear medium, the phase of the second idler light is 2φ p +2Δφ p (1)-φ s +3π / 2, according to the formula for generating the crosstalk signal in the nonlinear medium, the phase of the second crosstalk signal is φ p +Δφ p (1)+π.

[0096] After the fourth pump light, the third signal light, the second idler light, and the second crosstalk signal are input into the second phase shifter, the second phase shifter will add a second phase shift amount Δφ to the fourth pump light p (2) The fifth pump light is generated. The phase of the fifth pump light is φ p +π / 2 + Δφ p (1)+Δφ p (2).

[0097] The second pump light, the second idler light, and the first invalid signal are input into the first end of the second coupler, and the fourth pump light, the third signal light, and the second invalid signal are input into the second end of the second coupler. After the second coupler couples the optical signals input into the first end and the second end of the second coupler, the signal light output from the third end of the second coupler has two phases, which are φ p and φ p +π + Δφ p (1)+Δφp( 2), the pump light output from the third end of the second coupler has two phases, which are φs + π / 2 and φs + π / 2 respectively, and the idler light output from the third end of the second coupler has two phases, which are 2φ p - φs and 2φ p + 2Δφ p (1)- φs + 2π, the crosstalk signal output from the third end of the second coupler has two phases, which are φ p + π / 2, and φ p + Δφ p (1)+ 3π / 2.

[0098] The signal light output from the fourth end of the second coupler has two phases, which are φ p + π / 2 and φ p + π / 2 + Δφ p (1)+ Δφ p (2), the pump light output from the fourth end of the second coupler has two phases, which are φ s + π / 2, φ s + π / 2, and the idler light output from the fourth end of the second coupler has two phases, which are 2φ p - φ s + π / 2, 2φ p + 2Δφ p (1)- φ s + 3π / 2, the crosstalk signal output from the fourth end of the second coupler has two phases, which are φp + π and φ p + Δφ p (1)+ π.

[0099] When the first phase shift amount Δφ p (1) is 2πi, where i is a positive integer greater than zero. The first ineffective signal is the first crosstalk signal, and the second ineffective signal is the second crosstalk signal. The crosstalk signal output from the third end of the second coupler will interfere and cancel, and thus the separation between the signal light and the crosstalk signal can be achieved at the third end of the second coupler.

[0100] When the first phase shift amount Δφ p (1) is π / 2 + πi, where i is a positive integer greater than zero. The first ineffective signal is the first idler light, and the second ineffective signal is the second idler light. The idler light output from the third end of the second coupler will interfere and cancel, and thus the separation between the signal light and the idler light can be achieved at the third end of the second coupler.

[0101] When the second phase shift amount Δφ p(2) When it is 2πi, where i is a positive integer greater than zero. The first end of the second coupler receives the third pump light, the second end of the second coupler receives the fifth pump light. After the third pump light and the fifth pump light interfere with each other at the third end of the second coupler, they cancel each other out. The third pump light and the fifth pump light undergo constructive interference at the fourth end of the second coupler, and the second coupler outputs the pump light generated after the constructive interference at its fourth end.

[0102] When the second phase shift amount Δφ p (2) When it is π / 2 + πi, where i is a positive integer greater than zero. The first end of the second coupler receives the third pump light, the second end of the second coupler receives the fifth pump light. After the third pump light and the fifth pump light interfere with each other at the fourth end of the second coupler, they cancel each other out. The third pump light and the fifth pump light undergo constructive interference at the third end of the second coupler, and the second coupler outputs the pump light generated after the constructive interference at its third end.

[0103] Figure 5 is a schematic diagram of an embodiment of a replication device provided by an embodiment of the present application.

[0104] Please refer to Figure 5 , as Figure 5 shown, the optical signal replication device mentioned in the embodiments of the present application includes: a first circulator, a second circulator, a third coupler, a third phase shifter, and a third nonlinear medium.

[0105] In the embodiments of the present application, a circulator is a multi-port device that transmits the incident wave entering any of its ports in the direction sequence determined by the static bias magnetic field to the next port. A circulator is a non-reversible device with several ports. Optionally, the type of the circulator in the embodiments of the present application can be a micro-optical fiber circulator, an electronic circulator, or other types of circulators, and specific details are not limited here.

[0106] The coupler, phase shifter, and nonlinear medium mentioned in the embodiments of the present application are similar to the coupler, phase shifter, and nonlinear medium mentioned in the embodiments shown above Figure 2 , and specific details are not elaborated here.

[0107] The first end of the first circulator is connected to the transmitter, the second end is connected to the first end of the third coupler, and the third end is connected to the third attenuator.

[0108] The first end of the second circulator is connected to the pump laser, the second end is connected to the second end of the second coupler, and the second end is connected to the fourth attenuator.

[0109] In the embodiments of the present application, the optical signal replication device in the optical parametric amplifier is connected to the signal processing module. Optionally, the signal processing module may include a third attenuator and a fourth attenuator, and the signal processing module may also include other components, which are not specifically defined here.

[0110] The third end of the third coupler is connected to the first end of the third phase shifter, and the fourth end of the third coupler is connected to the first end of the third nonlinear medium.

[0111] The second end of the third phase shifter is connected to the second end of the nonlinear medium.

[0112] In the embodiments of the present application, after the first end of the first circulator receives the fourth signal light emitted by the transmitter, the second end of the first circulator outputs the fourth signal light to the first end of the third coupler. After the first end of the second circulator receives the sixth pump light emitted by the pump laser, the second end of the second circulator outputs the sixth pump light to the second end of the third coupler.

[0113] The first end of the third coupler receives the fourth signal light derived from the second end of the first circulator, and the second end of the third coupler receives the sixth pump light emitted by the second end of the second circulator. After the third coupler couples the fourth signal light and the sixth pump light proportionally, the third end of the third coupler outputs the fifth signal light and the seventh pump light to the first end of the third phase shifter, and the fourth end of the third coupler outputs the sixth signal light and the eighth pump light to the first end of the third nonlinear medium.

[0114] In the embodiments of the present application, the third coupler couples the sixth pump light and the fourth signal light in a certain proportion, and the specific coupling ratio may be in a 50:50 manner.

[0115] In the embodiments of the present application, when the optical signal is transmitted counterclockwise in the optical signal replication device, after the first end of the third phase shifter receives the fifth signal light and the seventh pump light, the third phase shifter adds a third phase shift amount to the seventh pump light to generate the ninth pump light, and the second end of the third phase shifter outputs the fifth signal light and the ninth pump light to the third nonlinear medium.

[0116] After the second end of the third nonlinear medium receives the fifth signal light and the ninth pump light, the fifth signal light and the ninth pump light undergo a three-wave mixing effect or a four-wave mixing effect in the third nonlinear medium. After the fifth signal light and the ninth pump light undergo a three-wave mixing effect or a four-wave mixing effect, a third invalid signal will be generated, and the first end of the third nonlinear medium will input the fifth signal light, the ninth pump light, and the third invalid signal to the fourth end of the third coupler.

[0117] When the optical signal is transmitted clockwise in the optical signal replication device, after the first end of the third nonlinear medium receives the sixth signal light and the eighth pump light, the sixth signal light and the eighth pump light generate a three-wave mixing effect or a four-wave mixing effect in the third nonlinear medium. After the sixth signal light and the eighth pump light generate a three-wave mixing effect or a four-wave mixing effect, a fourth invalid signal will be generated. The second end of the third nonlinear medium will input the sixth signal light, the eighth pump light, and the fourth invalid signal to the second end of the third phase shifter.

[0118] The second end of the third phase shifter receives the sixth signal light, the eighth pump light, and the fourth invalid signal. After the third phase shifter increases the fourth phase shift amount to the eighth pump light, the tenth pump light is generated. The first end of the third phase shifter will input the sixth signal light, the tenth pump light, and the fourth invalid signal to the third end of the third coupler.

[0119] After the third coupler couples the optical signals received at the third end and the fourth end in proportion, the third invalid signal and the fourth invalid signal interfere with each other and cancel each other out at the first end of the third coupler. The fifth signal light and the sixth signal light undergo constructive interference. The first end of the third coupler outputs the signal light after constructive interference to the second end of the first circulator. The fifth signal light and the sixth signal light interfere with each other and cancel each other out at the second end of the third coupler. The second end of the third coupler outputs the pump light after constructive interference and the invalid signal after constructive interference.

[0120] In the embodiment of the present application, the third coupler couples the optical signals received at the third end and the fourth end according to a certain ratio. The specific coupling ratio can be a 1:1 coupling method.

[0121] After the third coupler couples the fourth signal light and the sixth pump light in a 1:1 ratio, the third end of the third coupler outputs the fifth signal light and the seventh pump light to the first end of the third phase shifter. The signal intensity of the fifth signal light is 50% of the signal intensity of the fourth signal light. The fifth signal light and the fourth signal light have the same phase. The signal intensity of the seventh pump light is 50% of the signal intensity of the sixth pump light. The phase difference between the seventh pump light and the sixth pump light is π / 2;

[0122] The fourth end of the third coupler outputs the sixth signal light and the eighth pump light to the first end of the third nonlinear medium. The signal intensity of the sixth signal light is 50% of the signal intensity of the fourth signal light. The phase difference between the sixth signal light and the fourth signal light is π / 2. The signal intensity of the eighth pump light is 50% of the signal intensity of the sixth pump light. The eighth pump light and the sixth pump light have the same phase.

[0123] After the second end of the first circulator receives the signal light after constructive interference, the third end of the first circulator will output the signal light after constructive interference to the third attenuator.

[0124] When the third phase shift amount is 2πi, where i is a positive integer greater than zero, the third invalid signal is the third crosstalk signal, and the fourth invalid signal is the fourth crosstalk signal.

[0125] After the third coupler couples the optical signal received at the third end and the fourth end in a ratio of 1:1, the third crosstalk signal and the fourth crosstalk signal interfere with each other and cancel each other out at the first end of the third coupler. The fifth signal light and the sixth signal light undergo constructive interference. The first end of the third coupler outputs the signal light after constructive interference to the second end of the first circulator, and the second end of the third coupler outputs the pump light after constructive interference and the crosstalk signal after constructive interference.

[0126] When the third phase shift amount is π / 2 + 2πi, where i is a positive integer greater than zero, the third invalid signal is the third idler light, and the fourth invalid signal is the fourth idler light.

[0127] After the third coupler couples the optical signal received at the third end and the fourth end in a ratio of 1:1, the third idler light and the fourth idler light interfere with each other and cancel each other out at the first end of the third coupler. The fifth signal light and the sixth signal light undergo constructive interference. The first end of the third coupler outputs the signal light after constructive interference to the second end of the first circulator, and the second end of the third coupler outputs the pump light after constructive interference and the idler light after constructive interference.

[0128] In the embodiments of the present application, the optical signal replication device included in the optical parametric amplifier will generate invalid signals during the transmission of the signal light and the pump light. The optical signal replication device can separate the signal light from the invalid signals and then transmit them to the signal processing module. In this way, the signal processing module can directly process the signal light that does not include invalid signals, and the invalid signals will not occupy the transmission bandwidth of the optical parametric amplifier, and the effective transmission bandwidth of the optical parametric amplifier is relatively large.

[0129] The above has introduced the optical signal replication device provided by the embodiments of the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An optical signal copier, characterized in that, Including: A first coupler, a second coupler, a first nonlinear medium, a second nonlinear medium, and a first phase shifter; A first end of the first coupler is connected to a pump laser, a second end is connected to a transmitter, a third end is connected to a first end of the first nonlinear medium, and a fourth end is connected to a first end of the first phase shifter; A second end of the first nonlinear medium is connected to a first end of the second coupler; A second end of the first phase shifter is connected to a first end of the second nonlinear medium; A second end of the second nonlinear medium is connected to a second end of the second coupler; The first end of the first coupler receives a first pump light emitted by the pump laser, the second end of the first coupler receives a first signal light emitted by the transmitter, after the first coupler couples the first pump light and the first signal light according to a first ratio, a third end of the first coupler outputs a second pump light and a second signal light to the first nonlinear medium, and a fourth end of the first coupler outputs a third pump light and a third signal light to the first phase shifter; After the first nonlinear medium receives the second pump light and the second signal light, the second pump light and the second signal light generate a first three-wave mixing effect or a four-wave mixing effect in the first nonlinear medium, and a first ineffective signal is generated after the second pump light and the second signal light generate a three-wave mixing effect or a four-wave mixing effect; After the first phase shifter receives the third pump light and the third signal light, the first phase shifter generates a fourth pump light after adding a first phase shift amount to the third pump light; After the second nonlinear medium receives the fourth pump light and the third signal light, the fourth pump light and the third signal light generate a three-wave mixing effect or a four-wave mixing effect in the second nonlinear medium, and a second ineffective signal is generated after the fourth pump light and the third signal light generate a three-wave mixing effect or a four-wave mixing effect; The first end of the second coupler inputs the second pump light, the second signal light, and the first ineffective signal output by the first nonlinear medium, the second end of the second coupler inputs the fourth pump light, the third signal light, and the second ineffective signal, and the second coupler couples the optical signals input to the first end and the second end of the second coupler according to a second ratio; After the second coupler couples the optical signals input to the first end and the second end of the second coupler according to a ratio, the first ineffective signal and the second ineffective signal interfere with each other and cancel each other out at a third end of the second coupler, the second signal light and the third signal light undergo constructive interference at the third end of the second coupler, and the second coupler outputs the signal light generated after constructive interference.

2. The optical signal replication device according to claim 1, characterized in that, The first phase shift amount is 2πi, where i is a positive integer greater than zero, the first ineffective signal is a first crosstalk signal, and the second ineffective signal is a second crosstalk signal.

3. The optical signal replication device according to claim 1, wherein The first phase shift amount is π / 2 + πi, where i is a positive integer greater than zero. The first ineffective signal is the first idler light, and the second ineffective signal is the second idler light.

4. The optical signal replication device according to claim 1, wherein The first ratio is 1:1; After the first coupler couples the first pump light and the first signal light in a ratio of 1:1, the third end of the first coupler outputs the second pump light and the second signal light to the first nonlinear medium. The signal intensity of the second pump light is 50% of the signal intensity of the first pump light. The phase difference between the second pump light and the first pump light is π / 2. The signal intensity of the second signal light is 50% of the signal intensity of the first signal light. The second signal light and the first signal light have the same phase; The fourth end of the first coupler outputs the third pump light and the third signal light to the second nonlinear medium. The signal intensity of the third pump light is 50% of the signal intensity of the first pump light. The third pump light and the first pump light have the same phase. The signal intensity of the third signal light is 50% of the signal intensity of the first signal light. The phase difference between the third signal light and the first signal light is π / 2.

5. The optical signal replication device according to any one of claims 1 to 4, characterized in that The optical signal replication device further includes a second phase shifter; The first end of the second phase shifter is connected to the second nonlinear medium; The second end of the second phase shifter is connected to the second end of the second coupler; After the second phase shifter receives the fourth pump light, the third signal light, and the second ineffective signal, the second phase shifter increases the phase of the fourth pump light by a second phase shift amount to generate a fifth pump light. The second end of the second phase shifter transmits the fifth pump light to the second end of the second coupler.

6. The optical signal replication device according to claim 5, wherein The second phase shift amount is 2πi, where i is a positive integer greater than zero; The first end of the second coupler receives the third pump light, and the second end of the second coupler receives the fifth pump light. The third pump light and the fifth pump light cancel each other out after interference at the third end of the second coupler. The third pump light and the fifth pump light undergo constructive interference at the fourth end of the second coupler. The fourth end of the second coupler outputs the pump light generated after constructive interference.

7. The optical signal replication device according to claim 5, characterized in that, The second phase shift amount is π + 2πi, where i is a positive integer greater than zero; The first end of the second coupler receives the third pump light, and the second end of the second coupler receives the fifth pump light. The third pump light and the fifth pump light cancel each other out after interference at the fourth end of the second coupler. The third pump light and the fifth pump light undergo constructive interference at the third end of the second coupler. The third end of the second coupler outputs the pump light generated after constructive interference.

8. An optical signal copier, characterized in that, Comprising: A first circulator, a second circulator, a third coupler, a third phase shifter, and a third nonlinear medium; The first end of the first circulator is connected to a transmitter, the second end is connected to the first end of the third coupler, and the third end is connected to a third attenuator; The first end of the second circulator is connected to the pump laser, the second end is connected to the second end of the third coupler, and the third end is connected to the fourth attenuator; The third end of the third coupler is connected to the first end of the third phase shifter, and the fourth end of the third coupler is connected to the first end of the third nonlinear medium; The second end of the third phase shifter is connected to the second end of the third nonlinear medium; After the first end of the first circulator receives the fourth signal light emitted by the transmitter, the second end of the first circulator outputs the fourth signal light to the first end of the third coupler; After the first end of the second circulator receives the sixth pump light emitted by the pump laser, the second end of the second circulator outputs the sixth pump light to the second end of the third coupler; The first end of the third coupler receives the fourth signal light derived from the second end of the first circulator, and the second end of the third coupler receives the sixth pump light emitted by the second end of the second circulator. After the third coupler couples the fourth signal light and the sixth pump light according to a third ratio, the third end of the third coupler outputs the fifth signal light and the seventh pump light to the first end of the third phase shifter, and the fourth end of the third coupler outputs the sixth signal light and the eighth pump light to the first end of the third nonlinear medium; The optical signal is transmitted counterclockwise in the optical signal replication device. After the first end of the third phase shifter receives the fifth signal light and the seventh pump light, the third phase shifter adds a third phase shift amount to the seventh pump light to generate the ninth pump light, and the second end of the third phase shifter outputs the fifth signal light and the ninth pump light to the third nonlinear medium; After the second end of the third nonlinear medium receives the fifth signal light and the ninth pump light; the fifth signal light and the ninth pump light undergo a three-wave mixing effect or a four-wave mixing effect in the third nonlinear medium. After the fifth signal light and the ninth pump light undergo a three-wave mixing effect or a four-wave mixing effect, a third ineffective signal is generated. The first end of the third nonlinear medium inputs the fifth signal light, the ninth pump light, and the third ineffective signal to the fourth end of the third coupler; The optical signal is transmitted clockwise in the optical signal replication device. After the first end of the third nonlinear medium receives the sixth signal light and the eighth pump light, the sixth signal light and the eighth pump light undergo a three-wave mixing effect or a four-wave mixing effect in the third nonlinear medium. After the sixth signal light and the eighth pump light undergo a three-wave mixing effect or a four-wave mixing effect, a fourth ineffective signal is generated. The second end of the third nonlinear medium inputs the sixth signal light, the eighth pump light, and the fourth ineffective signal to the second end of the third phase shifter; The second end of the third phase shifter receives the sixth signal light, the eighth pump light, and the fourth ineffective signal. After adding a fourth phase shift amount to the eighth pump light, the third phase shifter generates a tenth pump light. The first end of the third phase shifter inputs the sixth signal light, the tenth pump light, and the fourth ineffective signal to the third end of the third coupler; After the third coupler couples the optical signals received at the third end and the fourth end in proportion, the third ineffective signal and the fourth ineffective signal interfere with each other and cancel each other out at the first end of the third coupler. The fifth signal light and the sixth signal light undergo constructive interference. The first end of the third coupler outputs the signal light after constructive interference to the second end of the first circulator. The second end of the third coupler outputs the pump light after constructive interference and the ineffective signal after constructive interference; After receiving the signal light after constructive interference at the second end of the first circulator, the third end of the first circulator outputs the signal light after constructive interference to the third attenuator.

9. The optical signal replication device according to claim 8, wherein The third phase shift amount is 2πi, where i is a positive integer greater than zero. The third ineffective signal is a third crosstalk signal, and the fourth ineffective signal is a fourth crosstalk signal.

10. The optical signal replication device according to claim 8, characterized in that, The third phase shift amount is π / 2 + 2πi, where i is a positive integer greater than zero. The third ineffective signal is a third idler light, and the fourth ineffective signal is a fourth idler light.

11. The optical signal replication device according to claim 8, wherein The third ratio is 1:1; After the third coupler couples the fourth signal light and the sixth pump light in a ratio of 1:1, the third end of the third coupler outputs the fifth signal light and the seventh pump light to the first end of the third phase shifter. The signal intensity of the fifth signal light is 50% of the signal intensity of the fourth signal light. The fifth signal light has the same phase as the fourth signal light. The signal intensity of the seventh pump light is 50% of the signal intensity of the sixth pump light. The phase difference between the seventh pump light and the sixth pump light is π / 2; The fourth end of the third coupler outputs the sixth signal light and the eighth pump light to the first end of the third nonlinear medium. The signal intensity of the sixth signal light is 50% of the signal intensity of the fourth signal light. The phase difference between the sixth signal light and the fourth signal light is π / 2. The signal intensity of the eighth pump light is 50% of the signal intensity of the sixth pump light. The eighth pump light has the same phase as the sixth pump light.

12. An optical parametric amplifier, characterized in that, The optical parametric amplifier includes: an optical signal replication device, a signal processing device, and a signal amplification device. The signal processing device is used to process the optical signal output by the optical signal replication device. The signal processing device includes a first attenuator and a second attenuator. The signal amplification device is used to amplify the optical signal processed by the signal processing device. The optical signal replication device is the optical signal replication device according to any one of claims 1 to 7.

13. An optical parametric amplifier, characterized in that, The optical parametric amplifier includes: an optical signal replication device, a signal processing device, and a signal amplification device. The signal processing device is used to process the optical signal output by the optical signal replication device. The signal processing device includes a first attenuator and a second attenuator. The signal amplification device is used to amplify the optical signal processed by the signal processing device. The optical signal replication device is the optical signal replication device according to any one of claims 8 to 11.

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