A high-fidelity optical pulse signal circulating replication device

Abstract

This invention relates to a high-fidelity optical pulse signal cyclic replication device, belonging to the field of optical communication. The device includes a 2×2 3dB fiber coupler, a 1×2 3dB fiber coupler, a high-speed optical switch, an optical switch drive control board, an optical isolator, a 1×2 fiber coupler, a fiber circulator, an electrically controlled delay line, a delay fiber, a reflector, a fiber amplifier, and a chassis. The coupling ratio of the 1×2 fiber coupler is 10% / 90%. This invention employs a fiber amplifier to compensate for insertion loss in the fiber loop, theoretically ensuring equal amplitude output. A high-speed optical switch is used to solve the problem of excessive noise accumulation after multiple replications, effectively zeroing loop noise. A narrowband optical filter is used to effectively suppress noise in the loop. Simultaneously, a high-reflectivity reflector is used to form a reflective structure, making the delay time twice that of unidirectional transmission.

Description

Technical Field

[0001] This invention belongs to the field of optical communication and relates to a high-fidelity optical pulse signal cyclic replication device. Background Technology

[0002] With the rapid development of microwave photonics and optical communication, fiber pulse replication technology is mainly used in microwave photonics, radar electronic warfare, optical communication and other fields.

[0003] Compared to traditional high-speed electrical pulse signal replication technology, which uses coaxial cables, SAW devices, and CCD devices as signal transmission media, resulting in short delay times and small bandwidths, fiber optic pulse replication technology utilizes optical fibers as the transmission medium. This gives it the advantages of optical fiber transmission characteristics, such as low loss, low dispersion, large bandwidth (THz), strong anti-interference capability, and excellent electromagnetic compatibility. Therefore, fiber optic pulse replication technology is increasingly used in microwave photonics, radar electronic warfare, and optical communications, especially in broadband microwave optical processing.

[0004] There are three main types of fiber pulse replication technology: feedforward pulse replication, tree-structured pulse replication, and cyclic pulse replication. Cyclic fiber pulse replication typically uses multiple 2×2 optical couplers cascaded to form an asymmetric Mach-Zehnder interferometer structure. The amplitude and time interval of the output pulse signal are determined by the splitting ratio of the couplers and the length of the delay fibers. Therefore, to obtain pulse signals with equal amplitude and periodic intervals, the splitting ratio of the couplers must be strictly controlled to 1:1, and the lengths of all delay fibers (L1, L2, L...) must be... 3··· L n-1 L n The structure of feedforward fiber pulse replication needs to form a geometric sequence. The splitting ratio of the coupler and the length control of the delay fiber make it difficult to obtain multiple pulse signals with equal amplitude and period.

[0005] For tree-structured fiber pulse replication technology, which consists of two 1×N optical couplers and delay fibers, the lengths of all delay fibers (L1, L2, L...) are... 3··· L n-1 L n The sequence must form a geometric progression. The number of pulse replications in a tree-structured fiber optic cable depends on the number of ports N of the coupler's splitter. Disadvantages of tree-structured fiber optic pulse replication: Since optical couplers typically have only a dozen or so ports, it's difficult to achieve multiple pulse signal replications. As the number of ports increases, the insertion loss of the optical coupler increases, severely degrading the signal-to-noise ratio. Furthermore, the different production line lengths for each path result in varying output signal amplitudes. Simultaneously, precise control of the length of each fiber is required to ensure equal-period replication, making the process exceptionally difficult. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a high-fidelity optical pulse signal cyclic replication device. This invention's device is designed with an external interface, allowing users to add additional delay fibers according to their needs, thereby increasing the delay period.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A high-fidelity optical pulse signal cyclic replication device includes a 2×2 3dB fiber coupler, a 1×2 3dB fiber coupler, a high-speed optical switch, an optical switch drive control board, an optical isolator, a 1×2 fiber coupler, a fiber circulator, an electrically controlled delay line, a delay fiber, a mirror, a fiber amplifier, and a chassis; wherein the coupling ratio of the 1×2 fiber coupler is 10% / 90%.

[0009] The 2×2 3dB fiber coupler, 1×2 3dB fiber coupler, high-speed optical switch, optical switch drive control board, optical isolator, 1×2 fiber coupler, fiber circulator, electrically controlled delay line, delay fiber, reflector, and fiber amplifier are installed in the chassis.

[0010] The optical pulse signal generated by the front-end electro-optic modulator is input to a 2×2 3dB fiber coupler. The optical signal is output in a 50%:50% ratio, with one path transmitted to a 1×2 3dB fiber coupler and the other to a high-speed optical switch. Then, it passes through an optical isolator to ensure unidirectional transmission. After passing through the 1×2 fiber coupler, 10% of the output signal is used for optical delay measurement, and the remaining 90% continues to be transmitted within the fiber circulator. After passing through the fiber circulator, it is transmitted from port 1 to port 2, and after passing through an electrically controlled delay line and delay fiber, it is reflected back by a mirror and transmitted to port 3. The optical signal output from port 3 is connected to the flange interface and then to the input of the fiber amplifier. After passing through the fiber amplifier, the signal is transmitted to the 2×2 3dB fiber coupler, forming a cyclic fiber pulse replication structure. Finally, it is output in equal proportion by the 1×2 3dB fiber coupler.

[0011] Optionally, a delay fiber is added between the 3-port optical signal output and the flange interface.

[0012] Optionally, the controllable delay line has an adjustment range of 0 to 330 ps.

[0013] Optionally, the high-speed optical switch achieves on / off switching. When the optical pulse is replicated a certain number of times in the loop, high and low levels are used to switch the high-speed optical switch to achieve zero loop noise.

[0014] Optionally, the gain of the fiber amplifier is adjustable in the range of 15 to 30 dB, and the noise figure is ≤3 dB to compensate for the insertion loss caused by the fiber and devices in the loop; in order to achieve signal cyclic replication without saturation, the gain of the fiber amplifier is not greater than the insertion loss.

[0015] Cyclic optical pulse replication is equivalent to multiple cascaded amplifiers with zero gain, according to the noise figure cascade formula:

[0016]

[0017] NF tot The noise figure is the total noise figure of multiple cascaded amplifiers, NF represents the noise figure of amplifiers from level 1 to level N, and G corresponds to the gain of amplifiers from level 1 to level N; i = 1, 2, 3…N;

[0018] When the number of replications is 50, the signal-to-noise ratio deteriorates by 19.83 dB, and when the number of replications is 100, the signal-to-noise ratio deteriorates by 23.15 dB.

[0019] Optionally, the fiber delay line is made by winding 5km of optical fiber into a fiber loop with a diameter of 110mm and a height of 44mm.

[0020] The reflector has a reflectivity of ≥99%, reflecting the input optical signal back to the delay fiber, making the delay period twice that of unidirectional transmission.

[0021] Optionally, the optical filter is a dense wavelength division multiplexer (DWDM), with a center wavelength of 1550.12 nm and a 3 dB bandwidth of 50 GHz.

[0022] Optionally, the optical switch driver control board is driven by a 9V DC voltage. A high level of 3.3V controls the high-speed optical switch to be in the working state, and a low level of 0V controls the high-speed optical switch to be in the working state. It has two control modes: one is to control the optical switch working state with a single signal; the other is to control the switch state with a dual signal.

[0023] Single-signal control mode: The control signal line is connected to the CTRL0 pin. When the CTRL0 input signal is 3.3V (high level), Q3 and Q4 are on, Q5 is off, PIN2 is high (9V), CTRL1 is low (0V), Q2 and Q6 are off, Q7 is on, and PIN1 outputs 0V, at which point the switch is on; when the CTRL0 pin outputs a low level, the switch is off.

[0024] Dual-signal control mode: Remove R1 from the circuit and connect both CTRL0 and CTRL1 pins simultaneously. When the input signal to CTRL0 is 3.3V and the input signal to CTRL1 is 0V, Q3 and Q4 are on, Q5 is off, Q2 and Q6 are off, Q7 is on, PIN1 outputs 0V, and PIN2 is high at 9V, thus turning on the switch. When the input signal to CTRL0 is 0V and the input signal to CTRL1 is 3.3V, Q3 and Q4 are off, Q5 is on, Q2 and Q6 are on, Q7 is off, PIN1 outputs 9V, and PIN2 is high at 0V, thus turning off the switch.

[0025] Optionally, the chassis is a module with a length of 240mm, a width of 160mm, and a height of 48mm. The entire module panel is designed with several FC / APC interfaces, while the module power supply and debugging interfaces adopt the J30J-15 interface.

[0026] Optionally, a delay fiber is added before the fiber amplifier to compensate for optical path delay; or a delay fiber and a Raman pump source are added before the fiber amplifier, with the gain medium being the delay fiber in the loop.

[0027] The beneficial effects of this invention are as follows:

[0028] This invention employs a cyclic fiber pulse replication structure. The device consists of a fiber coupler, an optical switch, an optical isolator, a circulator, an electrically controlled delay line, a mirror, a 5km delay fiber, and an optical switch drive control circuit. It overcomes the severe optical signal attenuation caused by the large number of replications in traditional cyclic fiber pulse replication. Furthermore, the use of an electrically controlled delay line allows for precise control of the replication period. The device also features an external interface, allowing users to add additional delay fibers to extend the delay period according to their needs.

[0029] Compared with the previous two fiber pulse replication technologies, this invention has the advantages of equal pulse period and precisely adjustable period, and the same intensity of output pulse signal. It can be applied to microwave photonics, all-optical radar, radar electronic warfare, optical data storage and long-distance optical digital testing.

[0030] This invention employs an optical fiber amplifier to compensate for insertion loss in the optical fiber loop, theoretically ensuring equal amplitude output; it uses a high-speed optical switch to solve the problem of excessive noise accumulation after multiple replications, thus zeroing out loop noise; it uses a narrowband optical filter to effectively suppress noise in the loop; and it employs a high-reflectivity mirror to form a reflective structure, making the delay time twice that of unidirectional transmission.

[0031] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0033] Figure 1 This is a structural diagram of the present invention;

[0034] Figure 2 To illustrate the relationship between the degree of signal-to-noise ratio degradation and the number of fiber ring replications;

[0035] Figure 3 The transmission and reflection spectrum curves are for dense wavelength division multiplexing (DWDM).

[0036] Figure 4 This is a schematic diagram of the optical switch drive control principle.

[0037] Figure 5 This is a schematic diagram illustrating the principle of pulse replication in other types of optical fibers. Detailed Implementation

[0038] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0039] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0040] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0041] To generate equally spaced, equal-amplitude, long-sequence pulse sequences, this invention effectively solves the problems of inconsistent pulse sequence amplitude caused by non-uniform splitting ratio of couplers in feedforward fiber pulse replication, and inconsistent pulse sequence period caused by process errors in cutting delay fibers. It also effectively solves the problems of inconsistent pulse sequence amplitude caused by large insertion loss and non-uniform insertion loss of 1×N fiber couplers in tree-type fiber pulse replication technology, and inconsistent period caused by the inability to precisely cut the length of N fiber delay lines.

[0042] This invention employs an optical fiber amplifier to compensate for insertion loss in the optical fiber loop, theoretically ensuring equal amplitude output; it uses a high-speed optical switch to solve the problem of excessive noise accumulation after multiple replications, and is used to zero out loop noise; it employs a narrowband optical filter to effectively suppress noise in the loop, and uses a high-reflectivity mirror to form a reflective structure, making the delay time twice that of unidirectional transmission.

[0043] A high-fidelity optical pulse signal cyclic replication device comprises: 2×2 3dB fiber couplers, 1×2 3dB fiber couplers, a high-speed optical switch, an optical switch drive control board, an optical isolator, two 1×2 fiber couplers (10%:90%), a fiber circulator, an electrically controlled delay line, a delay fiber, a reflector, a fiber amplifier, and a chassis.

[0044] like Figure 1As shown, the optical pulse signal generated by the front-end electro-optic modulator is input to a 2×2 3dB fiber coupler. The optical signal is split into 50% and 50% outputs, one of which is transmitted to a 1×2 3dB fiber coupler, and the other to a high-speed optical switch. Then, it passes through an optical isolator, which ensures unidirectional transmission of the optical signal. Then, it passes through a (10%:90%) fiber coupler, where 10% of the output signal is used for optical delay measurement, and 90% of the output continues to be transmitted within the fiber optic loop. Then, it passes through a fiber optic circulator, from port 1 to port 2, and after passing through an electrically controlled delay line and a delay fiber, it is reflected back by a mirror and transmitted to port 3. The optical signal output from port 3 is connected to the flange interface of the module. Delay fibers can be added according to actual application requirements, or it can be directly shorted to the input end of the fiber amplifier. After passing through the fiber amplifier, the signal is transmitted to the 2×2 3dB fiber coupler, thus forming a cyclic fiber pulse replication structure. Then, it is output in equal proportion by the 1×2 3dB fiber coupler.

[0045] The electronically controlled delay line is used for optical path delay control, with a control range of 0-330ps; it can also adjust the loop delay accuracy, with an adjustment accuracy of up to 0.05ps.

[0046] High-speed optical switches utilize the switching function of high-speed optical switches to achieve zero loop noise when the optical pulse is replicated many times in the loop, causing an increase in loop noise accumulation and a serious deterioration in the signal-to-noise ratio. High and low levels can be used to switch the switch to achieve zero loop noise.

[0047] The present invention employs an optical fiber amplifier with a tunable gain range of 15-30 dB and a noise figure ≤3 dB. Its function is to compensate for the insertion loss introduced by the optical fiber and various components in the loop. To achieve cyclic signal replication without saturation, the gain of the optical fiber amplifier must not exceed its loss. Therefore, the present invention adjusts the gain of the optical fiber amplifier to achieve a net loop gain of zero. Thus, cyclic optical pulse replication can be equivalent to multiple cascaded amplifiers with a gain of 0, according to the noise figure cascade formula:

[0048]

[0049] Based on the above formula, the relationship between the degree of degradation of the simulation signal-to-noise ratio and the number of replications is calculated as follows: Figure 2 As shown, the signal-to-noise ratio (SNR) deteriorates by 19.83 dB when the number of copies is 50, and by 23.15 dB when the number of copies is 100. The SNR deteriorates rapidly in the first 50 copies, but approaches saturation as the number of copies increases. Therefore, a high SNR is required for the input optical pulse signal.

[0050] The fiber delay line of this invention uses 5km fine-diameter optical fiber, wound into an optical fiber loop with a diameter of 110mm and a height of 44mm, which provides an optical delay and storage function.

[0051] The present invention employs a high reflectivity (≥99%) mirror, which reflects the input optical signal back to the delay fiber, making the delay period twice that of unidirectional transmission.

[0052] Optical filters are used to filter out noise in the loop and suppress the decrease in signal-to-noise ratio caused by excessive cyclic replication. This invention uses a dense wavelength division multiplexer (DWDM) as the optical filter in the loop, such as... Figure 3 As shown, the center wavelength of the dense wavelength division multiplexer is 1550.12nm, and the 3dB bandwidth is 50GHz. The technical requirements are that the filter in the loop can be selected according to the center wavelength of the optical pulse signal, and a suitable narrowband filter can be selected; or a dense wavelength division multiplexer can be cascaded to obtain a narrower filter.

[0053] like Figure 4 As shown, the optical switch driver control board, based on the electrical performance parameters of the selected high-speed optical switch, is designed with a 9V DC voltage drive. A high level of 3.3V controls the high-speed optical switch to be on, and a low level of 0V controls the high-speed optical switch to be off. This technology retains two control methods in the design of the optical switch driver control circuit: one is single-signal control of the optical switch's operating state; the other is dual-signal control of the switch state.

[0054] In single-signal control mode, the control signal line only needs to be connected to the CTRL0 pin. When the CTRL0 input signal is 3.3V (high level), Q3 and Q4 are on, Q5 is off, and PIN2 is high (9V). At this time, CTRL1 is low (0V), Q2 and Q6 are off, Q7 is on, and PIN1 outputs 0V, thus turning the switch on. To turn the switch off, simply output a low level on the CTRL0 pin.

[0055] In the dual-signal control mode, R1 is removed from the circuit, and both CTRL0 and CTRL1 pins are connected simultaneously. When the input signal to CTRL0 is 3.3V and the input signal to CTRL1 is 0V, Q3 and Q4 are on, Q5 is off, Q2 and Q6 are off, Q7 is on, PIN1 outputs 0V, and PIN2 is high at 9V, at which point the switch is on. When the input signal to CTRL0 is 0V and the input signal to CTRL1 is 3.3V, Q3 and Q4 are off, Q5 is on, Q2 and Q6 are on, Q7 is off, PIN1 outputs 9V, and PIN2 is high at 0V, at which point the switch is off.

[0056] The aforementioned electronically controlled delay line, high-speed optical switch, fiber amplifier, fiber delay line, optical switch driver control board, optical coupler, reflector, fiber optic circulator, and optical filter are all housed in a module measuring 240mm in length, 160mm in width, and 48mm in height. The entire module panel features multiple FC / APC interfaces for easy plug-and-play applications. Meanwhile, the module's power supply and debugging interfaces utilize the J30J-15 interface.

[0057] Finally, the present invention may have other variations, such as Figure 1 In this case, a delay fiber is added before the fiber amplifier to compensate for the optical path delay; or it can be changed to something like... Figure 5 As shown, when a delay fiber and a Raman pump source are added to the extended section, if the length of the added delay fiber is too long, the insertion loss in the loop is large, and the gain of the fiber amplifier is insufficient, a Raman pump source can be used to pump the entire loop, with the delay fiber in the loop as the gain medium.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high fidelity optical pulse signal loop replica device, characterized by: The device includes 2×2 3dB fiber couplers, 1×2 3dB fiber couplers, a high-speed optical switch, an optical switch driver control board, an optical isolator, a 1×2 fiber coupler, a fiber circulator, an electrically controlled delay line, a delay fiber, a mirror, a fiber amplifier, an optical filter, and a chassis; wherein the coupling ratio of the 1×2 fiber coupler is 10% / 90%. The 2×2 3dB fiber coupler, 1×2 3dB fiber coupler, high-speed optical switch, optical switch drive control board, optical isolator, 1×2 fiber coupler, fiber circulator, electrically controlled delay line, delay fiber, reflector, and fiber amplifier are installed in the chassis. The optical pulse signal generated by the front-end electro-optic modulator is input to a 2×2 3dB fiber coupler. The optical signal is output in a 50%:50% ratio, with one path transmitted to a 1×2 3dB fiber coupler and the other to a high-speed optical switch. Then, it passes through an optical isolator to ensure unidirectional transmission. After passing through the 1×2 fiber coupler, 10% of the output signal is used for optical delay measurement, and the remaining 90% continues to be transmitted within the fiber circulator. After passing through the fiber circulator, it is transmitted from port 1 to port 2, and after passing through an electrically controlled delay line and delay fiber, it is reflected back by a mirror and transmitted to port 3. The optical signal output from port 3 is connected to the flange interface and then to the input of the fiber amplifier. After passing through the fiber amplifier, the signal is transmitted to the 2×2 3dB fiber coupler, forming a cyclic fiber pulse replication structure. Finally, it is output in equal proportion by the 1×2 3dB fiber coupler.

2. The high fidelity optical pulse signal loop replica device of claim 1, wherein: A delay fiber is installed between the 3-port optical signal output and the flange interface.

3. The high fidelity optical pulse signal loop replica device of claim 1, wherein: The adjustable range of the electronically controlled delay line is 0 to 330 ps.

4. The high fidelity optical pulse signal loop replica device of claim 1, wherein: The high-speed optical switch achieves on / off switching. When the optical pulse is replicated a certain number of times in the loop, the high-speed optical switch is switched using high and low levels to achieve zero loop noise.

5. The high fidelity optical pulse signal loop replica device of claim 1, wherein: The fiber optic amplifier has an adjustable gain range of 15–30 dB and a noise figure of ≤3 dB, compensating for insertion loss caused by optical fibers and devices in the loop; to achieve signal cyclic replication without saturation, the gain of the fiber optic amplifier is not greater than the insertion loss. Cyclic optical pulse replication is equivalent to multiple cascaded amplifiers with zero gain, according to the noise figure cascade formula: where NF tot is the total noise figure of a plurality of amplifier stages, NF represents the noise figure of the 1~N amplifier stages, G corresponds to the gain of the 1~N amplifier stages; i = 1, 2, 3…N; When the number of replications is 50, the signal-to-noise ratio deteriorates by 19.83 dB, and when the number of replications is 100, the signal-to-noise ratio deteriorates by 23.15 dB.

6. The high fidelity optical pulse signal loop replica device of claim 1, wherein: The fiber delay line is made of 5km of optical fiber wound into an optical fiber loop with a diameter of 110mm and a height of 44mm. The reflector has a reflectivity of ≥99%, reflecting the input optical signal back to the delay fiber, making the delay period twice that of unidirectional transmission.

7. The high fidelity optical pulse signal loop replica device of claim 1, wherein: The optical filter is a dense wavelength division multiplexer (DWDM), with a center wavelength of 1550.12 nm and a 3 dB bandwidth of 50 GHz.

8. The high fidelity optical pulse signal loop replica device of claim 1, wherein: The optical switch driver control board is driven by a 9V DC voltage. A high level of 3.3V controls the high-speed optical switch to be on, and a low level of 0V controls the high-speed optical switch to be off. It has two control modes: one is to control the optical switch to be on with a single signal; the other is to control the switch to be on with a dual signal. Single-signal control mode: The control signal line is connected to the CTRL0 pin. When the CTRL0 input signal is 3.3V (high level), Q3 and Q4 are on, Q5 is off, PIN2 is high (9V), CTRL1 is low (0V), Q2 and Q6 are off, Q7 is on, and PIN1 outputs 0V, at which point the switch is on; when the CTRL0 pin outputs a low level, the switch is off. Dual-signal control mode: Remove R1 from the circuit and connect both CTRL0 and CTRL1 pins simultaneously. When the input signal to CTRL0 is 3.3V and the input signal to CTRL1 is 0V, Q3 and Q4 are on, Q5 is off, Q2 and Q6 are off, Q7 is on, PIN1 outputs 0V, and PIN2 is high at 9V, thus turning on the switch. When the input signal to CTRL0 is 0V and the input signal to CTRL1 is 3.3V, Q3 and Q4 are off, Q5 is on, Q2 and Q6 are on, Q7 is off, PIN1 outputs 9V, and PIN2 is high at 0V, thus turning off the switch.

9. The high fidelity optical pulse signal loop replica device of claim 1, wherein: The chassis is a module with a length of 240mm, a width of 160mm, and a height of 48mm. The entire module panel is designed with several FC / APC interfaces, while the module power supply and debugging interfaces adopt the J30J-15 interface.

10. The high fidelity optical pulse signal loop replica device of claim 1, wherein: A delay fiber is added before the fiber amplifier to compensate for optical path delay; or a delay fiber and a Raman pump source are added before the fiber amplifier, with the gain medium being the delay fiber in the loop.

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