Ultra-long-distance optical fiber detection equipment

Abstract

The utility model relates to the technical field of optical communication, in particular to ultra-long-distance optical fiber detection equipment, which greatly improves the optical power of a first optical signal through an optical amplifier, so that the optical signal is subsequently attenuated in an optical fiber to be detected within the length of 300km and then is still kept within the detection range of a first detector; in order to prevent the optical power of a second optical signal obtained after saturation amplification of the first optical signal from still exceeding the detection range of the first detector after being attenuated by the to-be-detected optical fiber, a third optical signal is obtained by estimating the length of the to-be-detected optical fiber and attenuating the second optical signal through a first adjustable attenuator; after the optical power of the fourth optical signal exceeds the detection range of the first detector, the second optical signal is attenuated by adjusting the first adjustable attenuator, so that the fourth optical signal meets the detection range of the first detector; according to the utility model, the to-be-detected optical fiber with the length within 300km can be detected, and the ultra-long-distance to-be-detected optical fiber can be detected.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication, in particular to an ultra-long-distance optical fiber detection device. Background Art

[0002] As the distance of optical fiber communication gradually increases, the detection of optical fiber quality plays a key role in ensuring the ultra-long span all-optical transmission system. The degradation of optical fiber attenuation and whether the optical fiber line is broken are important indicators for testing the quality of transmission optical fiber. Optical power is the most basic measurement parameter in the optical fiber communication system, and it is one of the most important parameters for evaluating the performance of optical terminal equipment and assessing the quality of optical fiber transmission. At present, mainstream portable optical fiber detection equipment only meets the optical fiber transmission distance of 80km, and cannot provide a better test method for ultra-long span optical transmission systems.

[0003] In view of this, overcoming the defects of the prior art is an urgent problem to be solved in the field of this technology. Utility Model Content

[0004] The technical problem to be solved by the utility model is how to solve the problem that the prior art cannot perform ultra-long distance optical fiber detection.

[0005] The utility model adopts the following technical solutions:

[0006] In a first aspect, an ultra-long-distance optical fiber detection device is provided, comprising: a control unit 1, an optical module 2, an optical amplifier 3, a first adjustable attenuator 4 and a first detector 5; the control unit 1 is connected to the first detector 5; the optical module 2, the optical amplifier 3 and the first adjustable attenuator 4 are coupled in sequence along an optical path; the optical module 2 is used to emit a first optical signal, and the optical amplifier 3 is used to amplify the first optical signal to obtain a second optical signal;

[0007] The first adjustable attenuator 4 is used to attenuate the power of the second optical signal accordingly to obtain a third optical signal, and transmit the third optical signal to the input end of the optical fiber to be tested; after the third optical signal is transmitted through the optical fiber to be tested, a fourth optical signal is output from the output end of the optical fiber to be tested;

[0008] The first detector 5 is used to convert the fourth optical signal into an electrical signal, and the control unit 1 is used to obtain a first detection result of the optical fiber to be tested according to the electrical signal.

[0009] Preferably, the detection device further comprises a first optical switch 6 and a red light unit 7; the output end of the first adjustable attenuator 4 is connected to the main end of the first optical switch 6, and by default, the main end of the first optical switch 6 is connected to the input end of the optical fiber to be tested, and the red light unit 7 is connected to the multiplexing end of the first optical switch 6;

[0010] The red light unit 7 is used to emit a red light signal, and the first optical switch 6 is used to switch the multiplexing end to be connected with the input end of the optical fiber to be tested, so as to transmit the red light signal to the input end of the optical fiber to be tested;

[0011] The red light signal is used to detect whether there is a break in the optical fiber to be tested.

[0012] Preferably, the detection device further comprises a first optical splitter 8 and a second detector 9, the main end of the first optical switch 6 is connected to the input end of the first optical splitter 8, the first output end of the first optical splitter 8 is connected to the input end of the optical fiber to be tested, and the second output end of the first optical splitter 8 is connected to the second detector 9; the second detector 9 is also connected to the control unit 1;

[0013] The second detector 9 is used to detect the power of the third optical signal input into the optical fiber to obtain a second detection result, and transmit the second detection result to the control unit 1. The control unit 1 is used to obtain the power of the third optical signal according to the second detection result.

[0014] Preferably, the wavelength range of the red light signal emitted by the red light unit 7 is 630nm-670nm, and the optical power range of the red light signal is 10dBm-13dBm.

[0015] Preferably, the detection device further comprises a second optical splitter 10, a second optical switch 11 and a second adjustable attenuator 12; the input end of the second optical splitter 10 is connected to the output end of the optical fiber to be tested, the first output end of the second optical splitter 10 is connected to the main end of the second optical switch 11, and in a default state, the main end of the second optical switch 11 is connected to the first detector 5; the second output end of the second optical splitter 10 is connected to the input end of the second adjustable attenuator 12, and the output end of the second adjustable attenuator 12 is connected to the multiplexing end of the second optical switch 11;

[0016] When the main end of the second optical switch 11 is connected to the first detector 5, the first detector 5 is used to detect the fourth optical signal;

[0017] When the power of the third optical signal input into the optical fiber to be tested is greater than a preset value, the multiplexing end of the second optical switch 11 is switched to be connected to the first detector 5, the second adjustable attenuator 12 is used to attenuate the power of the fourth optical signal, the first detector 5 is used to obtain the optical power of the attenuated fourth optical signal, and the control unit 1 is used to obtain the third detection result of the optical fiber to be tested according to the optical power of the attenuated fourth optical signal.

[0018] Preferably, the detection device further comprises a power supply unit 13, and the power supply unit 13 is used to provide electrical energy to the detection device.

[0019] Preferably, the wavelength of the first optical signal emitted by the optical module 2 is in the range of 1550.12 nm±0.2 nm, and the optical power of the first optical signal is in the range of 4 dBm to 5 dBm.

[0020] Preferably, the optical amplifier 3 is an erbium doped fiber amplifier (EDFA), a Raman fiber amplifier (RFA) or a remote optically pumped amplifier (ROPA), and the optical power range of the second optical signal output by the optical amplifier 3 is 4dBm to 26dBm, and the noise figure of the optical amplifier 3 is 4dB to 5dB.

[0021] Preferably, the adjustable attenuation range of the first adjustable attenuator 4 is 0 dB to 20 dB, and the inherent loss value is less than 0.3 dB.

[0022] Preferably, the optical power detected by the first detector 5 ranges from -45dBm to +10dBm.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] The utility model greatly improves the optical power of the first optical signal by adding the optical amplifier 3, so that it can still remain within the detection range of the first detector 5 after being attenuated in the optical fiber to be tested within a length of 300km. In addition, in order to prevent the optical power of the second optical signal obtained after the optical amplifier 3 saturates the first optical signal and still exceeds the detection range of the first detector 5 after being attenuated by the optical fiber to be tested, it is necessary to estimate the length of the optical fiber to be tested and obtain the third optical signal by correspondingly attenuating the second optical signal through the first adjustable attenuator 4. At the same time, after the optical power of the fourth optical signal exceeds the detection range of the first detector 5, the second optical signal can be further attenuated by adjusting the first adjustable attenuator 4 so that the fourth optical signal meets the detection range of the first detector 5. The solution of the utility model can realize the detection of the optical fiber to be tested with a length of less than 300km, and realize the detection of the ultra-long-distance optical fiber to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of an ultra-long-distance optical fiber detection device provided by an embodiment of the utility model;

[0027] Figure 2 This is another structural schematic diagram of an ultra-long-distance optical fiber detection device provided by an embodiment of the utility model;

[0028] Figure 3 This is another structural schematic diagram of an ultra-long-distance optical fiber detection device provided by an embodiment of the utility model;

[0029] Figure 4 This is another structural schematic diagram of an ultra-long-distance optical fiber detection device provided by an embodiment of the utility model;

[0030] Figure 5 It is a schematic diagram of the overall structure of an ultra-long-distance optical fiber detection device provided by an embodiment of the utility model.

[0031] In all drawings, like reference numerals refer to like structures, wherein:

[0032] Control unit 1, optical module 2, optical amplifier 3, first adjustable attenuator 4, first detector 5, first optical switch 6, red light unit 7, first optical splitter 8, second detector 9, second optical splitter 10, second optical switch 11, second adjustable attenuator 12, power supply unit 13. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as open inclusion, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner, that is, although they may be carried in the embodiments or examples of the above terms due to reasons such as the order and position of appearance, it is not limited to that they can be carried in combination by one embodiment or example.

[0035] In the description of the present utility model, the terms "first" and "second" are used for descriptive purposes only, and shall not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, the meaning of "multiple" is two or more. In addition, for example, the description may also use the method of adding "A" and "B" at the end to describe the same type of nouns as two independent individuals. In this case, the corresponding features defined as "A" and "B" are only used to distinguish the same type of individuals for description purposes, and shall not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

[0036] When describing some embodiments, the expressions "coupling", "coupling" and "connection" and their derivatives may be used. For example, when describing some embodiments, the term "connection" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupling" may be used to indicate that two or more components are in direct physical or electrical contact. However, the terms "connection" or "coupling" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other, such as "optical path coupling", "wireless connection", etc. The embodiments disclosed here are not necessarily limited to the contents of the present utility model.

[0037] In addition, the technical features involved in each embodiment of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Embodiment 1:

[0039] Currently, the maximum detection distance of mainstream fiber optic detection equipment is about 80km. As the fiber optic transmission distance increases, the demand for long-distance fiber optic detection is also increasing.

[0040] To solve the above problems, an ultra-long distance optical fiber detection device is proposed in this embodiment, such as Figure 1 As shown, it includes: a control unit 1, an optical module 2, an optical amplifier 3, a first adjustable attenuator 4 and a first detector 5; the control unit 1 is connected to the first detector 5; the optical module 2, the optical amplifier 3 and the first adjustable attenuator 4 are coupled in sequence along the optical path; the optical module 2 is used to emit a first optical signal, and the optical amplifier 3 is used to amplify the first optical signal to obtain a second optical signal; the first adjustable attenuator 4 is used to correspondingly attenuate the power of the second optical signal to obtain a third optical signal, and transmit the third optical signal to the input end of the optical fiber to be tested; after the third optical signal is transmitted by the optical fiber to be tested, a fourth optical signal is output from the output end of the optical fiber to be tested; the first detector 5 is used to convert the fourth optical signal into an electrical signal, and the control unit 1 is used to obtain a first detection result of the optical fiber to be tested according to the electrical signal.

[0041] It is worth noting that, for the convenience of describing this solution, the first optical signal, the second optical signal, the third optical signal and the fourth optical signal are all the same optical signal with only different optical powers, and all come from the first optical signal emitted by optical module 2.

[0042] The control unit 1 is the brain of the entire detection device, responsible for coordinating and controlling the entire detection process, and is connected to the first detector 5, receives the detection results, and processes these data to calculate the length of the optical fiber to be tested. The control unit 1 can be a microcontroller unit (MCU).

[0043] The optical module 2 is used to emit a first optical signal, which can be achieved by a laser diode or other types of light sources. In one embodiment, the wavelength of the first optical signal emitted by the optical module 2 is in the range of 1550.12nm±0.2nm, and the optical power of the first optical signal is in the range of 4dBm to 5dBm.

[0044] The optical amplifier 3 is used to amplify the first optical signal emitted by the optical module 2 to enhance its strength in long-distance optical fiber transmission. After amplification, the first optical signal becomes a second optical signal, and its power is sufficient to penetrate the long-distance optical fiber. In one embodiment, the optical amplifier 3 can be EDFA, RFA or ROPA, and the optical power of the second optical signal output by the optical amplifier 3 ranges from 4dBm to 26dBm, and the noise figure of the optical amplifier 3 is 4dB to 5dB.

[0045] The first adjustable attenuator 4 attenuates the power of the second optical signal according to the estimated length of the optical fiber to be tested to obtain the third optical signal. In one embodiment, the attenuation adjustable range of the first adjustable attenuator 4 is 0dB to 20dB, and the inherent loss value is less than 0.3dB. For example, the optical amplifier 3 saturates the first optical signal, and the second optical signal can meet the measurement of the optical fiber to be tested of about 300km. If the length of the optical fiber to be tested is only 100km-200km at this time, after the second optical signal is directly transmitted to the optical fiber to be tested, the optical power of the optical signal obtained after the transmission through the optical fiber to be tested will exceed the detection range of the first detector 5, which requires the second optical signal to be attenuated accordingly. This is done to ensure that the optical power of the fourth optical signal obtained after the third optical signal is transmitted through the optical fiber to be tested matches the detection range of the first detector 5 at the output end of the optical fiber to be tested, so that a measurable signal can be obtained at the output end of the optical fiber. The specific attenuation value can be calculated by estimating the length of the optical fiber to be tested or by a corresponding algorithm. The first adjustable attenuator 4 can attenuate the optical signal based on its own physical properties, which will not be described in detail in this embodiment.

[0046] At the same time, the first adjustable attenuator 4 can also attenuate the second optical signal by reverse adjustment, specifically including: when the first detector 5 cannot detect the optical power of the fourth optical signal, it can be inferred that the optical power of the fourth optical signal exceeds the detection range of the first detector 5. At this time, by adjusting the first adjustable attenuator 4, an adjustment unit value can be preset to attenuate the second optical signal until the fourth optical signal can be detected by the first detector 5, proving that the optical power of the third optical signal is appropriate at this time.

[0047] The first detector 5 is used to receive the fourth optical signal output from the output end of the optical fiber to be tested, and the first detector 5 is used to convert the fourth optical signal into an electrical signal, and detect the power of these electrical signals to obtain a first detection result of the optical fiber to be tested, and the first detection result may include parameters such as the attenuation of the optical fiber to be tested. The specific calculation process is the prior art and will not be described in detail in this embodiment. In one embodiment, the range of the optical power detected by the first detector 5 is -45dBm to +10dBm.

[0048] In this embodiment, the optical power of the first optical signal is greatly improved by adding the optical amplifier 3, so that it can still remain within the detection range of the first detector 5 after being attenuated in the optical fiber to be tested within a length of 300 km. In addition, in order to prevent the optical power of the second optical signal obtained after the optical amplifier 3 saturates the first optical signal and still exceeds the detection range of the first detector 5 after being attenuated by the optical fiber to be tested, it is necessary to estimate the length of the optical fiber to be tested and obtain the third optical signal by correspondingly attenuating the second optical signal through the first adjustable attenuator 4; at the same time, after the optical power of the fourth optical signal exceeds the detection range of the first detector 5, the second optical signal can be further attenuated by adjusting the first adjustable attenuator 4 so that the fourth optical signal meets the detection range of the first detector 5. The solution of the utility model can realize the detection of the optical fiber to be tested with a length of less than 300 km, and realize the detection of the ultra-long-distance optical fiber to be tested.

[0049] The current optical fiber detection equipment needs to detect whether there is a break in the optical fiber to be tested. In this embodiment, a structure that can accurately detect whether there is a break in the optical fiber to be tested is proposed. In one embodiment, Figure 2 As shown, the detection device also includes a first optical switch 6 and a red light unit 7; the output end of the first adjustable attenuator 4 is connected to the main end of the first optical switch 6. By default, the main end of the first optical switch 6 is connected to the input end of the optical fiber to be tested, and the red light unit 7 is connected to the multiplexing end of the first optical switch 6; the red light unit 7 is used to emit a red light signal, and the first optical switch 6 is used to switch the multiplexing end to be connected to the input end of the optical fiber to be tested, so as to transmit the red light signal to the input end of the optical fiber to be tested; the red light signal is used to detect whether there is a break in the optical fiber to be tested.

[0050] Among them, the red light unit 7 is a device that emits a red light signal, usually using a red laser diode or other red light source. The wavelength of the red light signal usually matches the transmission window of the optical fiber to be tested to ensure that the signal can be effectively transmitted in the optical fiber to be tested. The wavelength range of the red light signal emitted by the red light unit 7 is 630nm~670nm, and the optical power range of the red light signal is 10dBm~13dBm. The first optical switch 6 is used to switch the transmission path of the optical signal. By default, the main end of the first optical switch 6 is connected to the input end of the optical fiber to be tested so as to transmit the normal third optical signal to the optical fiber to be tested.

[0051] When it is necessary to detect whether the optical fiber is broken, the first optical switch 6 can switch its multiplexing end to connect with the input end of the optical fiber to be tested so as to send a red light signal. During normal operation, the device uses a normal third optical signal to pass through the optical fiber to be tested. When it is necessary to detect whether the optical fiber to be tested is broken, the device switches to a red light signal and sends the red light signal to the input end of the optical fiber to be tested. If the optical fiber is not broken, the red light signal will pass smoothly through the inside of the optical fiber to be tested and be detected at the output end of the optical fiber to be tested. If the optical fiber to be tested is broken, the red light signal cannot be detected at the output end of the optical fiber to be tested, thereby notifying the device that the optical fiber to be tested is broken and needs to be checked in time.

[0052] With this structure, the device can accurately detect whether there is a break in the optical fiber under test, which is very important for the maintenance and troubleshooting of optical fiber networks. The key advantage of this method is that it does not interfere with normal communications because it does not use red light signals under normal circumstances and only uses them when detection is required.

[0053] In one embodiment, in the above case, the power of the third optical signal can be obtained by calculation, that is, the optical power of the third optical signal is finally obtained by the first optical signal emitted by the optical module 2, the second optical signal transmitted by the optical amplifier 3, and the third optical signal transmitted by the first adjustable attenuator 4, such as Figure 3 As shown, the detection device also includes a first optical splitter 8 and a second detector 9, the main end of the first optical switch 6 is connected to the input end of the first optical splitter 8, the first output end of the first optical splitter 8 is connected to the input end of the optical fiber to be tested, and the second output end of the first optical splitter 8 is connected to the second detector 9; the second detector 9 is also connected to the control unit 1; the second detector 9 is used to detect the power of the third optical signal input into the optical fiber to be tested to obtain a second detection result, and transmit the second detection result to the control unit 1, and the control unit 1 is used to obtain the power of the third optical signal according to the second detection result.

[0054] The first optical splitter 8 is used to transmit the input third optical signal to the input end of the optical fiber to be tested, and the first optical splitter 8 is also used to transmit the input third optical signal to the second detector 9, and the second detector 9 is used to detect the power of the third optical signal. The control unit 1 is used to process the data from the second detector 9 and calculate the power of the third optical signal based on the data. The control unit 1 can also obtain the attenuation parameter of the optical fiber to be tested based on the power of the third optical signal and the power of the fourth optical signal. The specific calculation method will not be described in detail in this embodiment.

[0055] In one embodiment, when the length of the optical fiber to be tested is very long, a high-power optical signal is required for detection. Accordingly, the power of the optical signal obtained at the output end of the optical fiber to be tested will be very large. The optical amplifier 3 in the above scheme can obtain a maximum optical signal of 26dBm. When the optical signal of 26dBm still cannot meet the detection requirements of the current length of the optical fiber to be tested, it is necessary to continue to increase the optical power of the optical signal input to the optical fiber to be tested. Since this embodiment is based on portability and low cost considerations, the maximum detectable optical power of the first detector 5 and the second detector 9 in this embodiment is 10dBm. When the optical power is greater than 26dBm, after transmission through the optical fiber to be tested, the first detector 5 may be unable to meet the detection requirements. Therefore, in order to solve the above problem, Figure 4 As shown, the detection device further includes a second optical splitter 10, a second optical switch 11 and a second adjustable attenuator 12; the input end of the second optical splitter 10 is connected to the output end of the optical fiber to be tested, the first output end of the second optical splitter 10 is connected to the main end of the second optical switch 11, and in a default state, the main end of the second optical switch 11 is connected to the first detector 5; the second output end of the second optical splitter 10 is connected to the input end of the second adjustable attenuator 12, and the output end of the second adjustable attenuator 12 is connected to the multiplexing end of the second optical switch 11; when the main end of the second optical switch 11 is connected to the first detector 5, the first detector 5 is used to detect the fourth optical signal; when the power of the third optical signal input to the optical fiber to be tested is greater than a preset value, the multiplexing end of the second optical switch 11 is switched to be connected to the first detector 5, the second adjustable attenuator 12 is used to attenuate the power of the fourth optical signal, the first detector 5 is used to obtain the optical power of the attenuated fourth optical signal, and the control unit 1 is used to obtain the third detection result of the optical fiber to be tested according to the optical power of the attenuated fourth optical signal.

[0056] Based on the above structure, the optical signal input to the optical fiber to be tested is an optical signal with an optical power greater than 26dBm emitted by other light sources, and the optical power of the optical signal at the output end of the optical fiber to be tested has exceeded the detection range of the first detector 5, so it is necessary to switch the multiplexing end of the second optical switch 11 to connect with the first detector 5, and attenuate the optical signal at the output end of the optical fiber to be tested through the second adjustable attenuator 12 until it meets the detection range of the first detector 5. Under the above structure, a high-power optical signal above 26dBm enters the second adjustable attenuator 12 through the second optical splitter 10, and the first detector 5 detects the optical power of the optical signal after attenuation by the second adjustable attenuator 12, and then processes it by the control unit 1, thereby realizing the measurement of the optical power of a high-power optical signal of 26dBm+.

[0057] In one embodiment, Figure 5 As shown, the detection device further includes a power supply unit 13, and the power supply unit 13 is used to provide electric energy to the detection device. All devices in the detection device that need power supply are provided with electric energy by the power supply unit 13, wherein, in one embodiment, the power supply unit 13 can supply power to the control unit 1, the optical module 2, the first detector 5, the second detector 9 and other devices by providing electric energy, so as to supply power to all devices that need electric energy, and more specific explanation is not given in this embodiment.

[0058] It is worth noting that in the description of the entire embodiment, all devices that need to be controlled by the control unit are connected to the control unit 1, such as the first adjustable attenuator 4, the first optical switch 6, the second detector 9, the second adjustable attenuator 12 and the second optical switch 11, etc., and other connection relationships are not shown in all the drawings in the specification.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultra-long distance optical fiber detection device, characterized in that: include: A control unit (1), an optical module (2), an optical amplifier (3), a first adjustable attenuator (4) and a first detector (5); the control unit (1) and the first detector (5) are connected; the optical module (2), the optical amplifier (3) and the first adjustable attenuator (4) are coupled in sequence along an optical path; the optical module (2) is used to emit a first optical signal, and the optical amplifier (3) is used to amplify the first optical signal to obtain a second optical signal; The first adjustable attenuator (4) is used to correspondingly attenuate the power of the second optical signal to obtain a third optical signal, and transmit the third optical signal to the input end of the optical fiber to be tested; after the third optical signal is transmitted through the optical fiber to be tested, a fourth optical signal is output from the output end of the optical fiber to be tested; The first detector (5) is used to convert the fourth optical signal into an electrical signal, and the control unit (1) is used to obtain a first detection result of the optical fiber to be tested according to the electrical signal.

2. The ultra-long distance optical fiber detection device according to claim 1, characterized in that: The detection device further comprises a first optical switch (6) and a red light unit (7); the output end of the first adjustable attenuator (4) is connected to the main end of the first optical switch (6); by default, the main end of the first optical switch (6) is connected to the input end of the optical fiber to be tested, and the red light unit (7) is connected to the multiplexing end of the first optical switch (6); The red light unit (7) is used to emit a red light signal, and the first optical switch (6) is used to switch the multiplexing end to be connected with the input end of the optical fiber to be tested, so as to transmit the red light signal to the input end of the optical fiber to be tested; The red light signal is used to detect whether there is a break in the optical fiber to be tested.

3. The ultra-long distance optical fiber detection device according to claim 2, characterized in that: The detection device further comprises a first optical splitter (8) and a second detector (9); the main end of the first optical switch (6) is connected to the input end of the first optical splitter (8), the first output end of the first optical splitter (8) is connected to the input end of the optical fiber to be tested, and the second output end of the first optical splitter (8) is connected to the second detector (9); the second detector (9) is also connected to the control unit (1); The second detector (9) is used to detect the power of the third optical signal input into the optical fiber to be tested to obtain a second detection result, and transmit the second detection result to the control unit (1); the control unit (1) is used to obtain the power of the third optical signal according to the second detection result.

4. The ultra-long distance optical fiber detection device according to claim 2, characterized in that: The wavelength range of the red light signal emitted by the red light unit (7) is 630nm-670nm, and the optical power range of the red light signal is 10dBm-13dBm.

5. The ultra-long distance optical fiber detection device according to claim 1, characterized in that: The detection device further comprises a second optical splitter (10), a second optical switch (11) and a second adjustable attenuator (12); the input end of the second optical splitter (10) is connected to the output end of the optical fiber to be tested, the first output end of the second optical splitter (10) is connected to the main end of the second optical switch (11), and in a default state, the main end of the second optical switch (11) is connected to the first detector (5); the second output end of the second optical splitter (10) is connected to the input end of the second adjustable attenuator (12), and the output end of the second adjustable attenuator (12) is connected to the multiplexing end of the second optical switch (11); When the main end of the second optical switch (11) is connected to the first detector (5), the first detector (5) is used to detect the fourth optical signal; When the power of the third optical signal input into the optical fiber to be tested is greater than a preset value, the multiplexing end of the second optical switch (11) is switched to be connected to the first detector (5), the second adjustable attenuator (12) is used to attenuate the power of the fourth optical signal, the first detector (5) is used to obtain the optical power of the attenuated fourth optical signal, and the control unit (1) is used to obtain a third detection result of the optical fiber to be tested according to the optical power of the attenuated fourth optical signal.

6. The ultra-long distance optical fiber detection device according to claim 1, characterized in that: The detection device further comprises a power supply unit (13), wherein the power supply unit (13) is used to provide electrical energy to the detection device.

7. The ultra-long distance optical fiber detection device according to any one of claims 1 to 6, characterized in that: The wavelength of the first optical signal emitted by the optical module (2) is in the range of 1550.12nm±0.2nm, and the optical power of the first optical signal is in the range of 4dBm-5dBm.

8. The ultra-long distance optical fiber detection device according to any one of claims 1 to 6, characterized in that: The optical amplifier (3) is an EDFA, an RFA or a ROPA, the optical power of the second optical signal output by the optical amplifier (3) ranges from 4dBm to 26dBm, and the noise figure of the optical amplifier (3) ranges from 4dB to 5dB.

9. The ultra-long distance optical fiber detection device according to any one of claims 1 to 6, characterized in that: The attenuation adjustable range of the first adjustable attenuator (4) is 0 dB to 20 dB, and the inherent loss value is less than 0.3 dB.

10. The ultra-long distance optical fiber detection device according to any one of claims 1 to 6, characterized in that: The first detector (5) detects optical power in a range of -45dBm to +10dBm.

Images