Active lossless optical splitting device and method applied to FTTx system

Abstract

The invention provides an active lossless optical splitting device and method applied to an FTTx system, and the method comprises the steps: enabling an external terminal, a first compensation amplifier, a one-to-two optical splitter and a multi-path optical splitter to be sequentially connected to serve as an uplink optical path, and enabling the multi-path optical splitter to be connected with a plurality of clients respectively to achieve the link compensation; an optical signal in an uplink optical path is compensated and amplified through a first compensation amplifier, so that the compensation requirement of link expansion is met; and on the other hand, the optical signal is introduced into the control module through the one-to-two optical splitter, and the first compensation amplifier is controlled through the control module, so that the emergent uplink optical path compensation of the FTTx system is met.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and in particular to an active lossless optical splitter and method for use in FTTx systems. Background Technology

[0002] With the continuous development of fiber optic communication, network applications such as video conferencing, teleconferencing, online communication, and AI interaction have entered thousands of households, driving a large demand for broadband services. Fiber to the x (FTTx) broadband access, due to its 1:64 and 1:128 one-to-many access methods, significantly saves network fiber optic cables and optical module terminals, and has now become the absolute mainstream access solution for fiber optic broadband worldwide.

[0003] Currently, in the application scenarios of FTTx systems, due to the limitations of fiber optic resources and link budget, a maximum of 128 clients can be connected. When more clients need to be connected at the same time, the corresponding link budget is insufficient, and there is a lack of corresponding compensation methods if link expansion is required.

[0004] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Summary of the Invention

[0005] The technical problem to be solved by this invention is how to achieve link expansion in the application scenarios of FTTx systems.

[0006] The present invention adopts the following technical solution: In a first aspect, an active lossless optical splitter for use in an FTTx system is provided, comprising: a first compensation amplifier 1, a one-to-two optical splitter 2, a control module 3, and a multiplexer 4, wherein: The first compensation amplifier 1, the one-to-two optical splitter 2, and the multiplexer 4 are connected in sequence to form an uplink optical path; the first compensation amplifier 1 is used to connect to an external terminal 5, and the multiplexer 4 is used to connect to multiple clients 6 respectively. The control module 3 is connected to the one-to-two optical splitter 2 and the first compensation amplifier 1, respectively. When one of the clients 6 transmits an optical signal to the 1-to-2 optical splitter 2 through the multiplexer 4, the 1-to-2 optical splitter 2 is used to split the optical signal into two paths. One optical signal is transmitted to the uplink optical path, and the other optical signal is transmitted to the control module 3. The control module 3 is used to control the first compensation amplifier 1 when it receives the optical signal. The first compensation amplifier 1 is used to amplify and compensate the optical signal input to the uplink optical path, and send the compensated and amplified optical signal to the external terminal 5.

[0007] Preferably, the control module 3 includes a control circuit 31 and a PD refractometer 32, wherein: One end of the PD refractometer 32 is connected to the one-to-two beam splitter 2, and the other end of the PD refractometer 32 is connected to one end of the control circuit 31. The other end of the control circuit 31 is connected to the first compensation amplifier 1. The PD optometry device 32 is used to receive optical signals from the one-to-two beam splitter 2. When the PD optometry device 32 receives the optical signal, it generates a voltage signal and sends it to the control circuit 31. The control circuit 31 is used to control the first compensation amplifier 1 after receiving the voltage signal.

[0008] Preferably, the control circuit 31 includes a first current drive chip 312; The first current driving chip 312 is used to inject a corresponding current into the first compensation amplifier 1 after receiving a voltage signal to turn on the first compensation amplifier 1, and to control the gain of the first compensation amplifier 1 on the optical signal by the current injected into the first compensation amplifier 1.

[0009] Preferably, when the light signal received by the PD optometry 32 is interrupted, the PD optometry 32 generates an inverted voltage signal and sends it to the control circuit 31; the first current driving chip 312 stops injecting the corresponding current into the first compensation amplifier 1 after receiving the inverted voltage signal and turns off the first compensation amplifier 1.

[0010] Preferably, the active lossless optical splitter device applied to the FTTx system further includes: a first wavelength division multiplexer 7, a second wavelength division multiplexer 8, and a second compensation amplifier 9, wherein: The first wavelength division multiplexer 7, the second compensation amplifier 9, and the second wavelength division multiplexer 8 are connected in sequence to form a downlink optical path; The first wavelength division multiplexer 7 is disposed between the external terminal 5 and the first compensation amplifier 1. One end of the first wavelength division multiplexer 7 is connected to the external terminal 5, and the other end of the first wavelength division multiplexer 7 is connected to the first compensation amplifier 1. The second wavelength division multiplexer 8 is disposed between the one-to-two optical splitter 2 and the multiplexer 4. One end of the second wavelength division multiplexer 8 is connected to the one-to-two optical splitter 2, and the other end of the second wavelength division multiplexer 8 is connected to the multiplexer 4. The second compensation amplifier 9 is connected to the control circuit 31; The first wavelength division multiplexer 7 is used to receive optical signals from external terminal 5 and transmit the optical signals to the multiplexer 4. The optical signals are then sent to the corresponding client 6 through the multiplexer 4. The second compensation amplifier 9 is used to gain and compensate the optical signals in the downlink optical path.

[0011] Preferably, the control circuit 31 further includes a second current drive chip 313; The second current driving chip 313 is used to inject a corresponding current into the second compensation amplifier 9, and to control the gain of the second compensation amplifier 9 on the optical signal by the current injected into the second compensation amplifier 9.

[0012] Preferably, the first compensation amplifier 1 is provided with a first TEC11, which is used to regulate the temperature of the first compensation amplifier 1; The control circuit 31 also includes a first TEC driver chip 314, which is used to sample the temperature of the first compensation amplifier 1 and adjust the current supplied to the first TEC 11 according to the sampled temperature to drive the first TEC 11 to heat or cool the first compensation amplifier 1.

[0013] Preferably, the second compensation amplifier 9 is provided with a second TEC91, which is used to regulate the temperature of the second compensation amplifier 9; The control circuit 31 also includes a second TEC driver chip 315, which is used to sample the temperature of the second compensation amplifier 9 and adjust the current supplied to the second TEC 91 according to the sampled temperature to drive the second TEC 91 to heat or cool the second compensation amplifier 9.

[0014] Secondly, an active lossless optical splitting method for use in an FTTx system is provided, comprising: When client 6 needs to send uplink data, client 6 outputs an optical signal to the optical splitter 2 according to the timing protocol; wherein, client 6 is one of all clients 6 connected to the multi-channel optical splitter 4; The optical signal is split into two paths by the optical splitter 2. One optical signal is transmitted to the control module 3. After the control module 3 detects the optical signal, it controls the first compensation amplifier 1. The other optical signal is input to the uplink optical path. After passing through the first compensation amplifier 1, the optical signal is amplified and compensated, and then transmitted to the external terminal 5. The external terminal 5 registers and interacts with the client 6 based on the received optical signal.

[0015] Preferably, one of the optical signals is transmitted to the control module 3. After detecting the optical signal, the control module 3 controls the first compensation amplifier 1, specifically including: One of the optical signals is transmitted to the PD optometry device 32 in the control module 3. The PD optometry device 32 generates a voltage signal and sends it to the first current drive chip 312 in the control module 3. After receiving a voltage signal, the first current driving chip 312 injects a corresponding current into the first compensation amplifier 1 to turn on the first compensation amplifier 1, and controls the gain of the first compensation amplifier 1 on the optical signal by the current injected into the first compensation amplifier 1.

[0016] This invention provides an active lossless optical splitter device and method for use in FTTx systems. An external terminal 5, a first compensation amplifier 1, a 1-to-2 optical splitter 2, and a multi-path optical splitter 4 are sequentially connected to form an uplink optical path. The multi-path optical splitter 4 is connected to multiple client terminals 6 to achieve link compensation. The first compensation amplifier 1 amplifies and compensates the optical signal in the uplink optical path, thereby meeting the compensation requirements for link expansion. Furthermore, the optical signal is introduced into a control module 3 via the 1-to-2 optical splitter 2. The control module 3 controls the first compensation amplifier 1, thereby meeting the burst uplink optical path compensation requirements of the FTTx system.

[0017] Furthermore, a second compensation amplifier 9 is set in the downlink optical path to compensate the downlink optical path of the FTTx system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of an active lossless optical splitter device applied to an FTTx system provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another active lossless optical splitter device applied to an FTTx system provided in an embodiment of the present invention; Figure 3 This is a circuit diagram of a power supply circuit in an active lossless optical splitter for an FTTx system, provided by an embodiment of the present invention. Figure 4 This is a schematic diagram of another active lossless optical splitter device applied to an FTTx system provided by an embodiment of the present invention; Figure 5This is a schematic diagram of another active lossless optical splitter device applied to an FTTx system provided in an embodiment of the present invention; Figure 6 This is a flowchart of an active lossless optical splitting method applied to an FTTx system provided by an embodiment of the present invention; Figure 7 This is a flowchart of a method for activating the first compensation amplifier in an active lossless optical splitting method applied to an FTTx system, provided by an embodiment of the present invention. Figure 8 This is a flowchart of a method for turning off the first compensation amplifier in an active lossless optical splitting method applied to an FTTx system, provided by an embodiment of the present invention. Figure 9 This is a flowchart of a method for operating the downlink optical path in an active lossless optical splitting method applied to an FTTx system, provided by an embodiment of the present invention. The attached figures are numbered as follows: First compensation amplifier 1; First TEC 11; One-to-two beam splitter 2; Control module 3; Control circuit 31; First current drive chip 312; Second current drive chip 313; First TEC drive chip 314; Second TEC drive chip 315; PD refractometer 32; Multiplexer 4; External terminal 5; Client 6; First wavelength division multiplexer 7; Second wavelength division multiplexer 8; Second compensation amplifier 9; Second TEC 91; External power adapter 321; Power control switch 322; Power conversion chip 323; Power indicator light 324. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0021] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure 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, they should not be construed as limitations on this disclosure.

[0022] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, for example, the description may use the prefix "A" or "B" to describe the same type of nouns as two independent entities. In this case, the corresponding features defined with "A" and "B" are used only to distinguish between similar entities and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0023] As used in this invention, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from a particular value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the particular quantity, i.e., the limitations of the measurement system.

[0024] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as openly inclusive, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples; that is, although they may be incorporated into embodiments or examples using the above terms for reasons such as order and position, it does not limit them to be incorporated in combination by a single embodiment or example.

[0025] Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] Example 1: Embodiment 1 of the present invention provides an active lossless optical splitter for use in FTTx systems, such as... Figure 1 As shown, it includes: a first compensation amplifier 1, a one-to-two beam splitter 2, a control module 3, and a multiplexer 4, wherein: The first compensation amplifier 1, the one-to-two optical splitter 2, and the multiplexer 4 are sequentially connected to form the uplink optical path; the first compensation amplifier 1 is used to connect to an external terminal 5, and the multiplexer 4 is used to connect to multiple client terminals 6 respectively. The control module 3 is connected to the one-to-two optical splitter 2 and the first compensation amplifier 1 respectively.

[0027] In this embodiment, the provided active lossless optical splitter is applied in an FTTx system; the external terminal 5 can be an optical line terminal (OLT), and the client 6 can be an optical network terminal (ONT). The first compensation amplifier 1 can be a semiconductor optical amplifier (SOA) element, specifically a 1310nm window SOA element. The first compensation amplifier 1 is used to compensate and amplify the optical signal. The actions between the client 6 and the external terminal 5 can include uploading and downloading. The uplink optical path is used to send uplink data, that is, the client 6 sends an optical signal to the external terminal 5, completing the registration and interaction between the client 6 and the external terminal 5, and performing the corresponding upload task.

[0028] A fixed attenuation flange is also provided between the first compensation amplifier 1 and the one-to-two beam splitter 2. The fixed attenuation flange is used to adjust the amount of light input to the first compensation amplifier 1 according to the actual situation of the link.

[0029] like Figure 1 As shown, when one of the clients 6 transmits an optical signal to the optical splitter 2 via the multi-channel splitter 4, the optical splitter 2 splits the optical signal into two paths. One optical signal is transmitted to the uplink optical path, and the other optical signal is transmitted to the control module 3. The control module 3 controls the first compensation amplifier 1 when it receives the optical signal. The first compensation amplifier 1 amplifies and compensates the optical signal input to the uplink optical path and sends the amplified and compensated optical signal to the external terminal 5.

[0030] In this embodiment, each client 6 needs to send uplink data according to the FTTx timing protocol. It should be noted that among all clients 6, only one client 6 can send uplink data at the same time, and the client 6 only sends the corresponding optical signal to the external terminal 5 when it has a sending requirement; triggering the first compensation amplifier 1 to compensate and amplify the optical signal, which can support burst uplink optical path compensation. This is due to the protocol characteristics of the FTTx access network, in which the downlink optical path adopts a broadcast connection mode and the uplink optical path adopts a time-division multiplexing connection mode, realizing a one-to-many application mode of central office and client, which greatly saves fiber and module resources. If multiple clients 6 in the uplink optical path execute uplink data transmission at the same time, conflicts may occur, leading to network failure.

[0031] When client 6 does not need to send uplink data, no client 6 will send optical signals to external terminal 5. In this case, the first compensation amplifier 1 needs to be turned off to meet the requirements of a bursty system. This is because if the first compensation amplifier 1 is continuously turned on, it will introduce optical noise into the uplink optical path. External terminal 5 will perceive this as a continuous intrusion from a rogue terminal, causing other clients 6 to be disconnected and unable to send uplink data, leading to system failure. This optical noise is mainly caused by continuous current injection into the optical amplifier. External terminal 5 will detect this noise and mistakenly interpret it as an optical signal from client 6, resulting in an incorrect response and an inability to respond to the correct uplink optical signal from client 6, thus causing network problems.

[0032] In summary, in the active lossless optical splitter in the FTTx system, the first compensation amplifier 1 is turned on when uplink data transmission is required and turned off when uplink data transmission is not required. Therefore, in this embodiment, a splitter 2 is used to split another optical path, and a control module 3 is set on the split optical path to control the first compensation amplifier 1. It should be noted that in this embodiment, the splitting ratio of the splitter 2 for the two optical paths can be 50% for each. When a client 6 sends an optical signal, the control module 3 will turn on the first compensation amplifier 1 upon receiving the optical signal, thereby compensating the optical signal in the uplink optical path. At the same time, the control module 3 can further adjust the gain amplification of the optical signal by the first compensation amplifier 1.

[0033] On the other hand, in an FTTx system, due to limited fiber resources and link budget, a maximum of 128 clients 6 can be connected. To expand the number of optical links and thus increase the number of users accessing the system, optical intensity compensation needs to be performed on all expanded links. With the device provided in this embodiment, corresponding compensation amplifiers are set on the uplink optical path to take into account the compensation and amplification of optical signals in each link and to meet the burst uplink optical path compensation of the FTTx system. Therefore, it can be further expanded to a maximum of 128 clients 6. Correspondingly, for every 3dB of optical intensity compensation, the splitting ratio can be doubled.

[0034] In this embodiment, by adjusting the number of optical paths split from the multi-channel optical splitter, the number of links can be further expanded. For example, based on the original 128 links, when the multi-channel optical splitter 4 is a 1:4 optical splitter, the number of links after expansion is 512. When the multi-channel optical splitter 4 is a 1:8 optical splitter, the number of links after expansion is 1024. Compared to the original 128 links, the total number of links increases exponentially, which allows the number of clients 6 that can be accessed to increase exponentially, greatly improving the efficiency and flexibility of optical communication transmission.

[0035] In this embodiment, in order to ensure that the control module 3 can automatically activate optical signal compensation amplification when it receives an optical signal, and can adjust the relevant parameters in the first compensation amplifier 1 to adjust the compensation value and gain value for the optical signal, this embodiment also involves the following design: like Figure 2 As shown, the control module 3 includes a control circuit 31 and a PD refractometer 32, wherein: One end of the PD refractometer 32 is connected to the one-to-two beam splitter 2, and the other end of the PD refractometer 32 is connected to one end of the control circuit 31. The other end of the control circuit 31 is connected to the first compensation amplifier 1. The PD refractometer 32 is used to receive optical signals from the one-to-two beam splitter 2. When the PD refractometer 32 receives the optical signal, it generates a voltage signal and sends it to the control circuit 31. The control circuit 31 is used to control the first compensation amplifier 1 after receiving the voltage signal.

[0036] like Figure 2 As shown, the control circuit 31 includes a first current driving chip 312; the first current driving chip 312 is used to inject a corresponding current into the first compensation amplifier 1 after receiving a voltage signal to turn on the first compensation amplifier 1, and to control the gain of the first compensation amplifier 1 on the optical signal by the current injected into the first compensation amplifier 1.

[0037] Accordingly, when client 6 finishes transmitting uplink data and stops sending optical signals, control module 3 needs to be able to turn off the first compensation amplifier 1 to meet the burst uplink timing requirements of the FTTx system. Therefore, this embodiment also involves the following design: When the light signal received by the PD optometry 32 is interrupted, the PD optometry 32 generates an inverted voltage signal and sends it to the control circuit 31; the first current drive chip 312 stops injecting the corresponding current into the first compensation amplifier 1 after receiving the inverted voltage signal and turns off the first compensation amplifier 1.

[0038] In this embodiment, due to the control logic between the PD optometry 32 and the first current drive chip 312, the turn-on response time and turn-off response time of the first compensation amplifier 1 can both reach a level of less than 50ns. On the other hand, in the timing protocol of the FTTx system, two different clients 6 need to ensure a certain preset time interval when transmitting optical signals. This preset time interval is set by those skilled in the art to ensure that the two clients 6 do not transmit optical signals seamlessly, thus avoiding the continuous operation of the first compensation amplifier 1 for compensation amplification, which would introduce optical noise.

[0039] like Figure 3 As shown, in this embodiment, the control module 3 is also connected to the power supply circuit. The power supply circuit includes an external power adapter 321, a power control switch 322, a power conversion chip 323, and a functional circuit connected in sequence. The power control switch 322 and the power conversion chip 323 are also connected to a grounding branch, and a power indicator light 324 is provided on the grounding branch.

[0040] The external power adapter 321 can be 220V to 5V and has a power supply current of more than 2A, and is used to power the control module 3; the power conversion chip 323 can be 5V to 3.3V.

[0041] In this embodiment, while the uplink optical path enables the client 6 to send uplink data to the external terminal 5, a corresponding downlink optical path is also needed to enable the external terminal 5 to transmit optical signals to the client 6, thus achieving the corresponding download task. Therefore, this embodiment also involves the following design: like Figure 4 As shown, the active lossless optical splitter device applied to the FTTx system further includes: a first wavelength division multiplexer 7, a second wavelength division multiplexer 8, and a second compensation amplifier 9, wherein: The first wavelength division multiplexer 7, the second compensation amplifier 9, and the second wavelength division multiplexer 8 are connected in sequence to form a downlink optical path.

[0042] In this embodiment, both the first wavelength division multiplexer 7 and the second wavelength division multiplexer 8 can be passive 1270nm / 1550nm wavelength division multiplexers. The second compensation amplifier 9 can be a 1550nm wavelength window SOA amplifier.

[0043] like Figure 4 As shown, the first wavelength division multiplexer 7 is disposed between the external terminal 5 and the first compensation amplifier 1. One end of the first wavelength division multiplexer 7 is connected to the external terminal 5, and the other end of the first wavelength division multiplexer 7 is connected to the first compensation amplifier 1.

[0044] like Figure 4 As shown, the second wavelength division multiplexer 8 is disposed between the one-to-two optical splitter 2 and the multiplexer 4. One end of the second wavelength division multiplexer 8 is connected to the one-to-two optical splitter 2, and the other end of the second wavelength division multiplexer 8 is connected to the multiplexer 4. The second compensation amplifier 9 is connected to the control circuit 31.

[0045] The first wavelength division multiplexer 7 is used to receive optical signals from external terminal 5 and transmit the optical signals to the multiplexer 4. The optical signals are then sent to the corresponding client 6 through the multiplexer 4. The second compensation amplifier 9 is used to gain and compensate the optical signals in the downlink optical path.

[0046] like Figure 4 As shown, the control circuit 31 also includes a second current drive chip 313; the second current drive chip 313 is used to inject a corresponding current into the second compensation amplifier 9, and control the gain of the second compensation amplifier 9 on the optical signal by the current injected into the second compensation amplifier 9.

[0047] In this embodiment, under the FTTx system, the external terminal 5 continuously sends optical signals to each client 6 through the downlink optical path. The control circuit 31 keeps the second compensation amplifier 9 in the downlink optical path continuously turned on and provides a stable injection current to the second compensation amplifier 9 through the second current driving chip 313, so as to ensure that the second compensation amplifier 9 continuously generates gain compensation for the optical signal in the downlink optical path. Thus, in the application scenario of the FTTx system, the uplink and downlink optical paths adopt a dual gain compensation method to compensate for the uplink and downlink power loss of each link.

[0048] It is worth mentioning that the external terminal 5 needs to continuously transmit optical signals to each client 6 through the downlink optical path, and the corresponding second compensation amplifier 9 needs to remain on to continuously amplify and compensate the optical signals in the downlink optical path.

[0049] Furthermore, in this embodiment, to ensure the stability of the corresponding compensation amplifier, a temperature control system is set in the corresponding compensation amplifier, and corresponding control is performed by the control module 3 to reduce the influence of the environment on the active optical splitter, thereby better controlling the compensated optical power gain and wavelength stability. Therefore, this embodiment also involves the following design: like Figure 5 As shown, the first compensation amplifier 1 is provided with a first TEC11, which is used to regulate the temperature of the first compensation amplifier 1; the control circuit 31 also includes a first TEC driver chip 314, which is used to sample the temperature of the first compensation amplifier 1 and provide a corresponding current to the first TEC11 according to the sampled temperature, so as to drive the first TEC11 to heat or cool the first compensation amplifier 1.

[0050] like Figure 5 As shown, the second compensation amplifier 9 is provided with a second TEC 91, which is used to regulate the temperature of the second compensation amplifier 9; the control circuit 31 also includes a second TEC driver chip 315, which is used to sample the temperature of the second compensation amplifier 9 and provide a corresponding current to the second TEC 91 according to the sampled temperature, so as to drive the second TEC 91 to heat or cool the second compensation amplifier 9.

[0051] In this embodiment, both the first compensation amplifier 1 and the second compensation amplifier 9 are provided with thermistors. The first TEC driver chip 314 and the second TEC driver chip 315 obtain and sample the temperature of the first compensation amplifier 1 and the temperature of the second compensation amplifier 9 based on the corresponding thermistors.

[0052] In summary, the active lossless optical splitter for FTTx systems provided in this embodiment can achieve the following beneficial effects: (1) For the uplink and downlink optical paths of the FTTx application system, active SOA components are used for power cost compensation, and the operating parameters of the SOA components can be adjusted to change the compensation effect.

[0053] (2) By using the control module 3 to support burst uplink optical path compensation of the FTTx system, when uplink incoming light or no light is detected, the response time of the SOA element to turn on or off can be controlled within the range of less than 50ns, which meets the requirements of burst system.

[0054] (3) By setting up corresponding heat sink devices and corresponding heat sink driving chips, the temperature of the corresponding SOA components can be adjusted and controlled to reduce the impact of the environment on the active optical splitter, thereby better controlling the compensated optical power gain and wavelength stability.

[0055] Example 2: This embodiment, based on Embodiment 1, provides an active lossless optical splitting method for use in FTTx systems, applicable to the active lossless optical splitting device for FTTx systems provided in Embodiment 1, such as... Figure 6 As shown, the method flow includes: In step 101, when client 6 needs to send uplink data, client 6 outputs an optical signal to the optical splitter 2 according to the timing protocol.

[0056] Client 6 is one of all clients 6 connected to the multi-channel splitter 4.

[0057] It should be noted that the client 6 can be any one of all clients 6 connected to the multi-channel splitter 4.

[0058] In step 102, the optical signal is split into two paths by the optical splitter 2. One optical signal is transmitted to the control module 3. After the control module 3 detects the optical signal, it controls the first compensation amplifier 1. The other optical signal is input to the uplink optical path. After passing through the first compensation amplifier 1, the optical signal is amplified and compensated, and then transmitted to the external terminal 5.

[0059] In step 103, the external terminal 5 registers and interacts with the client 6 based on the received optical signal, and sends uplink data.

[0060] The corresponding control module 3, upon receiving the optical signal, such as Figure 7 As shown, the method flow for controlling the first compensation amplifier 1 includes: In step 201, one of the optical signals is transmitted to the PD optometry device 32 in the control module 3. The PD optometry device 32 generates a voltage signal and sends it to the first current drive chip 312 in the control module 3.

[0061] In step 202, the first current driving chip 312 injects a corresponding current into the first compensation amplifier 1 after receiving the voltage signal to turn on the first compensation amplifier 1.

[0062] In step 203, the first current driving chip 312 controls the gain of the first compensation amplifier 1 on the optical signal by injecting current into the first compensation amplifier 1.

[0063] Furthermore, in order to meet the burst uplink timing requirements of the FTTx system, and to avoid the first compensation amplifier 1 being continuously turned on, which would introduce optical noise and cause other clients 6 to be disconnected, this embodiment also involves the following design: like Figure 8As shown, the method flow includes: In step 301, when the light signal received by the PD optometry 32 is interrupted, the PD optometry 32 generates an inverted voltage signal and sends it to the control circuit 31.

[0064] In step 302, after receiving the reverse voltage signal, the first current driving chip 312 stops injecting the corresponding current into the first compensation amplifier 1 and turns off the first compensation amplifier 1.

[0065] For the downlink optical path, such as Figure 9 As shown, this embodiment involves the following method flow: In step 401, the control circuit 31 keeps the second compensation amplifier 9 in the downlink optical path continuously turned on.

[0066] In step 402, a stable injection current is provided to the second compensation amplifier 9 through the second current drive chip 313.

[0067] In step 403, the second compensation amplifier 9 continuously provides gain compensation for the optical signal in the downlink optical path.

[0068] By employing dual-gain compensation in the uplink and downlink optical paths within the application scenarios of FTTx systems, uplink and downlink power degradation in each link can be compensated.

[0069] 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 within the protection scope of the present invention.

Claims

1. An active lossless optical splitter for use in FTTx systems, characterized in that, include: The system comprises a first compensation amplifier (1), a one-to-two optical splitter (2), a control module (3), and a multi-channel optical splitter (4), wherein: The first compensation amplifier (1), the one-to-two optical splitter (2), and the multi-channel optical splitter (4) are connected in sequence as the uplink optical path; the first compensation amplifier (1) is used to connect to the external terminal (5), and the multi-channel optical splitter (4) is used to connect to multiple clients (6) respectively; The control module (3) is connected to the one-to-two beam splitter (2) and the first compensation amplifier (1) respectively; When one of the clients (6) transmits an optical signal to the one-to-two optical splitter (2) through the multiplexer (4), the one-to-two optical splitter (2) is used to split the optical signal into two paths, one of which is transmitted to the uplink optical path; the other is transmitted to the control module (3). The control module (3) is used to control the first compensation amplifier (1) when it receives the optical signal. The first compensation amplifier (1) is used to amplify and compensate the optical signal input to the uplink optical path and send the compensated and amplified optical signal to the external terminal (5).

2. The active lossless optical splitter for FTTx systems according to claim 1, characterized in that, The control module (3) includes a control circuit (31) and a PD optometry device (32), wherein: One end of the PD refractometer (32) is connected to the one-to-two beam splitter (2), and the other end of the PD refractometer (32) is connected to one end of the control circuit (31), and the other end of the control circuit (31) is connected to the first compensation amplifier (1). The PD refractometer (32) is used to receive optical signals from the one-to-two beam splitter (2). When the PD refractometer (32) receives the optical signal, it generates a voltage signal and sends it to the control circuit (31). The control circuit (31) is used to control the first compensation amplifier (1) after receiving the voltage signal.

3. The active lossless optical splitter for FTTx systems according to claim 2, characterized in that, The control circuit (31) includes a first current drive chip (312). The first current driving chip (312) is used to inject a corresponding current into the first compensation amplifier (1) after receiving a voltage signal to turn on the first compensation amplifier (1), and to control the gain of the first compensation amplifier (1) on the optical signal by the current injected into the first compensation amplifier (1).

4. The active lossless optical splitter for FTTx systems according to claim 3, characterized in that, When the light signal received by the PD optometry (32) is interrupted, the PD optometry (32) generates an inverted voltage signal and sends it to the control circuit (31); the first current driving chip (312) stops injecting the corresponding current into the first compensation amplifier (1) after receiving the inverted voltage signal and turns off the first compensation amplifier (1).

5. The active lossless optical splitter for FTTx systems according to claim 2, characterized in that, The active lossless optical splitter for the FTTx system further includes: a first wavelength division multiplexer (7), a second wavelength division multiplexer (8), and a second compensation amplifier (9), wherein: The first wavelength division multiplexer (7), the second compensation amplifier (9) and the second wavelength division multiplexer (8) are connected in sequence as the downlink optical path; The first wavelength division multiplexer (7) is disposed between the external terminal (5) and the first compensation amplifier (1). One end of the first wavelength division multiplexer (7) is connected to the external terminal (5), and the other end of the first wavelength division multiplexer (7) is connected to the first compensation amplifier (1). The second wavelength division multiplexer (8) is disposed between the one-to-two optical splitter (2) and the multiplexer (4). One end of the second wavelength division multiplexer (8) is connected to the one-to-two optical splitter (2), and the other end of the second wavelength division multiplexer (8) is connected to the multiplexer (4). The second compensation amplifier (9) is connected to the control circuit (31); The first wavelength division multiplexer (7) is used to receive optical signals from external terminals (5) and transmit the optical signals to the multiplexer (4). The optical signals are sent to the corresponding client (6) through the multiplexer (4). The second compensation amplifier (9) is used to gain and compensate the optical signals in the downlink optical path.

6. The active lossless optical splitter for FTTx systems according to claim 5, characterized in that, The control circuit (31) also includes a second current drive chip (313). The second current driving chip (313) is used to inject a corresponding current into the second compensation amplifier (9) and control the gain of the second compensation amplifier (9) on the optical signal by the current injected into the second compensation amplifier (9).

7. The active lossless optical splitter for FTTx systems according to claim 2, characterized in that, The first compensation amplifier (1) is provided with a first TEC (11), which is used to regulate the temperature of the first compensation amplifier (1); The control circuit (31) also includes a first TEC driver chip (314), which is used to sample the temperature of the first compensation amplifier (1) and adjust the current supplied to the first TEC (11) according to the sampled temperature to drive the first TEC (11) to heat or cool the first compensation amplifier (1).

8. The active lossless optical splitter for FTTx systems according to claim 5, characterized in that, The second compensation amplifier (9) is provided with a second TEC (91), which is used to regulate the temperature of the second compensation amplifier (9); The control circuit (31) also includes a second TEC driver chip (315), which is used to sample the temperature of the second compensation amplifier (9) and adjust the current provided to the second TEC (91) according to the sampled temperature to drive the second TEC (91) to heat or cool the second compensation amplifier (9).

9. An active lossless optical splitting method applied to an FTTx system, characterized in that, For use in an active lossless optical splitter for an FTTx system as described in any one of claims 1-8, comprising: When the client (6) needs to send uplink data, the client (6) outputs an optical signal to the optical splitter (2) according to the timing protocol; wherein, the client (6) is one of all the clients (6) connected to the multi-channel optical splitter (4); The optical signal is split into two paths by the optical splitter (2). One optical signal is transmitted to the control module (3). After the control module (3) detects the optical signal, it controls the first compensation amplifier (1). The other optical signal is input to the uplink optical path. After passing through the first compensation amplifier (1), the optical signal is amplified and compensated and then transmitted to the external terminal (5). The external terminal (5) registers and interacts with the client (6) based on the received optical signal.

10. The active lossless optical splitting method applied to an FTTx system according to claim 8, characterized in that, One of the optical signals is transmitted to the control module (3). After detecting the optical signal, the control module (3) controls the first compensation amplifier (1). Specifically... include: One of the optical signals is transmitted to the PD optometry device (32) in the control module (3). The PD optometry device (32) generates a voltage signal and sends it to the first current drive chip (312) in the control module (3). After receiving the voltage signal, the first current driving chip (312) injects a corresponding current into the first compensation amplifier (1) to turn on the first compensation amplifier (1), and controls the gain of the first compensation amplifier (1) on the optical signal by the current injected into the first compensation amplifier (1).

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