An optical amplification and add-drop circuit for a converging split device and an apparatus thereof

Abstract

The application discloses an optical amplification and combining and separating wave circuit for converging and separating equipment and a device thereof, relates to the technical field of converging and separating equipment, and the optical amplification and combining and separating wave circuit comprises a wavelength selection switch module, an EDFA amplification circuit module, an MCU control module and a power module for providing working voltages for the modules, the wavelength selection switch module is connected with the MCU control module in communication through a serial interface, the EDFA amplification circuit module is connected with the MCU control module in communication through a serial interface, and the MCU control module is connected with an external network controller in data interaction through an SPI protocol. The application provides an optical amplification and combining and separating wave circuit capable of improving scheduling flexibility and expansibility, reducing system complexity and cost.

Description

Technical Field

[0001] This application relates to the field of convergence and splitting equipment technology, and in particular to an optical amplification and multiplexing / splitting circuit and apparatus for convergence and splitting equipment. Background Technology

[0002] Wavelength division multiplexing (WDM) technology, as the core carrier solution of optical communication networks, has evolved from a fixed grid architecture to a flexible grid architecture. Before the maturity and widespread application of wavelength selective switching (WSS) technology, the realization of functions such as wavelength routing, add / drop, and power equalization mainly relied on the combination of discrete components and a semi-static architecture. This type of solution fixes the relationship between wavelength, port, and transmission direction through physical hardware, such as using discrete components like filters and couplers with fixed wavelengths to build optical paths. Its core limitations are: firstly, the strong binding between hardware and wavelength leads to poor system scalability, and adding wavelengths or adjusting service paths requires redesigning hardware links; secondly, service scheduling relies on manual fiber patching or module replacement, and a single service change takes several hours, which cannot meet the real-time dynamic service requirements of scenarios such as 5G backhaul and data center interconnection.

[0003] There is an urgent need for an optical amplification and multiplexing / demultiplexing circuit that can improve scheduling flexibility and scalability while reducing system complexity and cost, in order to support real-time dynamic service scheduling and efficient utilization of spectral resources. Utility Model Content

[0004] In order to provide an optical amplification and multiplexing / demultiplexing circuit that can improve scheduling flexibility and scalability, and reduce system complexity and cost, this application provides an optical amplification and multiplexing / demultiplexing circuit and apparatus for a convergence and splitting device.

[0005] Firstly, this application provides an optical amplification and multiplexing / demultiplexing circuit for a convergence and splitting device, employing the following technical solution: An optical amplification and multiplexing / splitting circuit for a convergence and splitting device includes an MCU control module, a wavelength selection switch module, an EDFA amplifier circuit module, and a power supply module for providing operating voltage to each module. The wavelength selection switch module establishes a communication connection with the MCU control module through a serial interface, the EDFA amplifier circuit module establishes a communication connection with the MCU control module through a serial interface, and the MCU control module establishes data interaction with an external network controller through the SPI protocol.

[0006] By adopting the above technical solution, this application uses a wavelength selective switch module (WSS) as the core multiplexing / demultiplexing device, replacing the fixed wavelength configuration of traditional discrete devices. It supports dynamic adjustment of wavelength routing paths through software configuration, eliminating the need for manual fiber hopping or hardware replacement. Service change processing time can be reduced to milliseconds, meeting real-time dynamic scheduling requirements and achieving breakthroughs in wavelength binding, improving flexibility and scalability. The dynamic grid capability of the wavelength selective switch module adapts to the bandwidth requirements of different rate services (such as 10G / 25G / 100G), avoiding resource waste caused by fixed grids. Simultaneously, the MCU control module centrally manages serial communication (such as a UART interface) with the wavelength selective switch module and EDFA amplifier circuit module, enabling centralized control of module parameter configurations (such as wavelength routing tables and amplification gain), avoiding the complexity of multi-link independent control in discrete device solutions. The integrated module design reduces the number of discrete optical components, and the power supply module provides adapted operating voltages for each module, such as +5V_WSS and +3.3V, optimizing power supply stability.

[0007] Preferably, the wavelength selective switch module includes a WSS device, which includes a +5V WSS power line connected to the power module, a WSS_RX receiving line and a WSS_TX transmitting line that establish a communication connection with the serial interface of the MCU control module.

[0008] By adopting the above technical solution, the +5V_WSS power line is directly connected to the +5V power output terminal of the power module to provide the operating voltage for the WSS device; the WSS_RX receiving line is connected to the receiving terminal (such as the RX pin) of the MCU control module through a serial interface to receive wavelength configuration commands issued by the MCU control module; the WSS_TX transmitting line is connected to the transmitting terminal (such as the TX pin) of the MCU control module through a serial interface to feed back the status information of the WSS module to the MCU, including status information such as wavelength switching status and fault alarms. The bidirectional serial communication line enables the MCU control module to remotely control and monitor the status of the wavelength selection switch module.

[0009] Preferably, the wavelength selective switch module further includes a diffraction grating or an arrayed waveguide grating, the output end of which is connected to an optical switch array, and each output port of the optical switch array is equipped with an optical attenuator.

[0010] By employing the above technical solution, a diffraction grating or arrayed waveguide grating (AWG) serves as the core beam splitting device, used to separate the input composite optical signal into multiple single-wavelength channels according to wavelength. An optical switch array, connected to the grating output, can consist of multiple high-speed optical switches, such as MEMS optical switches, with each switch corresponding to the output port of one wavelength channel. An optical attenuator is then integrated into the output port of each optical switch to dynamically adjust the power level of the corresponding wavelength channel. The grating performs wavelength demultiplexing, the optical switch array enables dynamic routing switching of wavelength channels, and the optical attenuator ensures power balance across all channels.

[0011] Preferably, the optical switch array is configured as a 22×22 optical cross-connect matrix, the adjustment accuracy of the optical attenuator reaches 0.1dB, and the switching time of the optical switch array is ≤10ms.

[0012] By adopting the above technical solution, the optical switch array adopts a 22-row × 22-column cross-connection architecture, which supports arbitrary routing combinations of up to 22 wavelength channels, and the 0.1dB optical attenuator accuracy realizes fine power control; at the same time, the wavelength switching response time of the optical switch array of this application reaches ≤10 milliseconds, which meets the requirements of high-speed dynamic service scheduling.

[0013] Preferably, the MCU control module includes an MCU chip, which is connected to a crystal oscillator circuit and a power filter circuit. The crystal oscillator circuit includes a crystal oscillator Y1 and a crystal capacitor, and the power filter circuit includes an inductor L1 and a power filter capacitor.

[0014] By adopting the above technical solutions, the crystal oscillator circuit is used to provide a clock reference for the MCU chip, ensuring high timing accuracy; the power supply filter circuit is used to suppress power supply noise interference to the MCU chip.

[0015] Preferably, the MCU control module establishes communication with the EDFA_RX signal input pin and EDFA_TX signal output pin of the EDFA amplifier circuit module through a serial interface.

[0016] By adopting the above technical solution, the serial interface connecting the MCU control module and the EDFA amplifier circuit module is such as the UART interface. The EDFA_RX signal input pin is used to receive status feedback from the EDFA amplifier circuit module, such as optical power value and alarm signal; the EDFA_TX signal output pin is used to send control commands to the EDFA module, such as gain adjustment and laser switching.

[0017] Preferably, the power module includes a power chip, the VIN pin of which receives a 12V external power supply, the input terminal of which is connected to an input filter capacitor bank, and the output terminal of which is connected to an output filter capacitor bank.

[0018] By adopting the above technical solution, the VIN pin of the power supply chip receives the external power supply. The input filter capacitor bank is used to filter out the ripple noise of the input power supply; the output filter capacitor bank is used to stabilize the output voltage, and the power supply chip realizes voltage conversion and distribution.

[0019] Preferably, the input filter capacitor bank includes a first input filter capacitor, a second input filter capacitor, and a third input filter capacitor connected in parallel; the output filter capacitor bank includes a first output filter capacitor, a second output filter capacitor, and a third output filter capacitor connected in parallel.

[0020] By adopting the above technical solution, the parallel connection of multiple capacitors in the input filter capacitor bank and the output filter capacitor bank can enhance the filtering performance, so as to meet the suppression requirements of different frequency noises in optical amplification and multiplexing / demultiplexing circuits.

[0021] Secondly, this application provides an optical amplification and multiplexing / demultiplexing device for a convergence and splitting equipment, employing the following technical solution: An optical amplification and multiplexing / demultiplexing device for a convergence and splitting equipment includes a housing and a circuit board. The circuit board is disposed in the housing and carries an optical amplification and multiplexing / demultiplexing circuit for a convergence and splitting equipment as described above.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. This application uses a wavelength selective switch module (WSS) as the core multiplexing / demultiplexing device, replacing the fixed wavelength configuration of traditional discrete devices. It supports dynamic adjustment of wavelength routing paths through software configuration, eliminating the need for manual fiber hopping or hardware replacement. Service change time can be reduced to milliseconds, meeting the requirements of real-time dynamic scheduling, thereby breaking through wavelength binding and improving flexibility and scalability. The dynamic grid capability of the wavelength selective switch module adapts to the bandwidth requirements of different rate services (such as 10G / 25G / 100G), avoiding resource waste caused by fixed grids. This application provides an optical amplification and multiplexing / demultiplexing circuit that can improve scheduling flexibility and scalability while reducing system complexity and cost. 2. The MCU control module uses the SPI protocol to connect to the communication network, allowing for easier and more intuitive observation of the multiplexing and splitting process. When the wavelength selection switch module is connected to an optical fiber carrying signal light, the wavelength can be selected based on the internal working principle of the wavelength selection switch module. The EDFA amplifier amplifies the signal light connected to the wavelength selection switch module. This design achieves the functions of selecting, amplifying, and attenuating optical signals. 3. This application adds an MCU control circuit and an EDFA amplifier, which can acquire relevant data from the EDFA amplifier and wavelength selective switch module in real time. It can also more conveniently control the two modules, the EDFA amplifier and the wavelength selective switch module, to achieve real-time control function. Moreover, compared with the traditional module, the wavelength selective switch module of this application has more channels, providing more selection on different channels. Attached Figure Description

[0023] Figure 1 This is one of the circuit diagrams of the MCU control module in the optical amplification and multiplexing / splitting circuit of a convergence and splitting device in Embodiment 1.

[0024] Figure 2 This is another circuit diagram of the MCU control module in the optical amplification and multiplexing / splitting circuit of a convergence and splitting device in Embodiment 1.

[0025] Figure 3 This is a circuit diagram of a power supply module in an optical amplification and multiplexing / splitting circuit for a convergence and splitting device, as described in Embodiment 1. Figure 4 This is a circuit diagram of a wavelength selection switch module in an optical amplification and multiplexing / splitting circuit for a convergence and splitting device, as described in Embodiment 1. Figure 5 This is a circuit diagram of an EDFA amplifier circuit module in an optical amplification and multiplexing / splitting circuit for a convergence and splitting device, as described in Embodiment 1. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0027] Example 1 This application discloses an optical amplification and multiplexing / splitting circuit and apparatus for a convergence / splitting device. (Refer to...) Figures 1 to 5 The optical amplification and multiplexing / splitting circuit used in the convergence and splitting equipment includes an MCU control module, a wavelength selection switch module, an EDFA amplifier circuit module, and a power supply module for providing operating voltage to each module. The wavelength selection switch module establishes a communication connection with the MCU control module through a serial interface (not shown in the figure), the EDFA amplifier circuit module establishes a communication connection with the MCU control module through a serial interface, and the MCU control module establishes data interaction with an external network controller through the SPI protocol.

[0028] Reference Figure 1 and Figure 2 ,by Figure 1 and Figure 2Taking the circuit diagram shown as an example, the MCU control module includes an MCU chip. The MCU chip is configured with PE2, MTCK, and TMS function pins. The MCU chip can be an STM32F103C8T6 or an NXP LPC1768. The MCU chip is connected to a crystal oscillator circuit and a power supply filter circuit. The crystal oscillator circuit consists of crystal oscillator Y1 and two crystal capacitors C27 and C29 (both with a capacitance of 20pF and a withstand voltage of 50V). The two output terminals of crystal oscillator Y1 are grounded through C27 and C29 respectively, forming a π-type filter clock circuit to provide a stable main clock signal for the MCU chip.

[0029] Reference Figure 2 , Figure 2 The upper part of the circuit is the power supply filter circuit, which consists of inductor L1 (4.7uH) and two power supply filter capacitors C18 and C21 (both 0.1uF, 16V withstand voltage). The MCU chip's power supply is connected to a +3.3V power supply. The MCU chip communicates with the EDFA amplifier circuit module's EDFA_RX signal input pin and EDFA_TX signal output pin via a serial interface such as a UART interface. Figure 1 The PE2 pin of the MCU chip is configured as USART_TX (serial data transmit) and connected to the EDFA_RX signal input pin of the EDFA amplifier circuit module to send control commands such as gain adjustment and mode switching. The MTCK pin of the MCU chip is configured as USART_RX (serial data receive) and connected to the EDFA_TX signal output pin of the EDFA amplifier circuit module to establish communication and receive status feedback such as optical power and temperature alarms.

[0030] Reference Figure 2 , Figure 2 The lower half of the circuit is the reset circuit, which includes a reset chip (U2 in the diagram), resistors R19, R20, and R22, and capacitors C15 and C16. The reset chip monitors the MCU power supply voltage or internal status in real time. If an abnormality such as undervoltage or system crash occurs, it outputs a reset signal to force the MCU to restart. Resistor R19 and capacitor C15 form an RC power-on reset circuit, providing millisecond-level delay. Capacitor C16 is connected in parallel to the reset signal line STM_NRST_1 to suppress electromagnetic interference. Reference Figure 3 ,by Figure 3Taking the circuit diagram shown as an example, the power supply module includes a power supply chip (chip U2 in the diagram). For instance, the core component of the power supply module can be an LM2596S-ADJ. The VIN pin of the power supply chip receives a 12V external power supply. The input terminal of the power supply chip is connected to an input filter capacitor bank, and the output terminal is connected to an output filter capacitor bank. Alternatively, the power supply module can use a device of the LM2596S-ADJ model. Specifically, the input filter capacitor bank includes a first input filter capacitor C8, a second input filter capacitor C9, and a third input filter capacitor C10 connected in parallel; the output filter capacitor bank includes a first output filter capacitor C11, a second output filter capacitor C12, and a third output filter capacitor C13 connected in parallel. The power supply module provides +5V_WSS power to the wavelength selection switch module, +5V power to the EDFA amplifier circuit module, and +3.3V power to the MCU control module.

[0031] Reference Figure 4 ,by Figure 4 Taking the circuit diagram shown as an example, the wavelength selection switch module includes a WSS device. The MCU chip configures the wavelength and optical attenuation values ​​via a UART-based wavelength configuration table. For instance, wavelength selection is achieved by configuring the cross-connection relationship of a 22×22 optical switch matrix, such as routing the optical signal from input port 1 to output port 5. Optical power configuration refers to writing attenuation values ​​in 0.1dB increments to the optical attenuator; if the input optical power is overloaded, the attenuation value is increased to a specified range. Status feedback refers to the WSS device periodically transmitting the optical power values ​​of PD_IN / PD_OUT via UART. If the MCU detects that the optical power exceeds a preset threshold, such as PD_IN < -30dBm or PD_OUT > 0dBm, it triggers an alarm and adjusts the configuration.

[0032] The WSS device includes a +5V WSS power supply line connected to the power module, a WSS_RX receive line and a WSS_TX transmit line that establish a communication connection with the serial interface of the MCU control module. The wavelength selective switch module also includes a diffraction grating or an arrayed waveguide grating (…). Figure 4 The diagram shows a grating-type WSS (wavelength selective grating). The output of the diffraction grating or arrayed waveguide grating is connected to an optical switch array. Each output port of the optical switch array is equipped with an optical attenuator (the diffraction grating or arrayed waveguide grating and the optical attenuator are not shown in the diagram; they can be implemented using existing devices in the prior art). It is important to emphasize that the optical switch array is set as a 22×22 optical cross-connect matrix, the adjustment accuracy of the optical attenuator reaches 0.1dB, and the switching time of the optical switch array is ≤10ms. The wavelength selective switch module can use devices from the FSI-5000 series or NCP-5000 series.

[0033] Reference Figure 5 ,by Figure 5Taking the circuit diagram shown as an example, the EDFA amplifier circuit module includes an integrated EDFA chip, such as the Finisar FBA-28-15. For instance, the integrated EDFA chip has a gain range of 15dB, an output power of +15dBm at full configuration, and a wavelength range of 1530nm~1565nm in the C-band or 1571nm~1611nm in the L-band. The integrated EDFA chip has multiple pins, including a +5V power input pin, a GND ground pin, an EDFA_RX signal input pin, an EDFA_TX signal output pin, and LOS1 and LOS2 optical loss monitoring pins. Specifically, the EDFA_RX signal input pin is the optical input pin, connected to an external optical signal (via an LC / APC interface), requiring a fiber optic patch cord to connect to upstream equipment; the EDFA_TX signal output pin is the optical output pin, connected to a downstream optical module or fiber optic cable; the LOS1 and LOS2 optical loss monitoring pins are optical loss monitoring pins, which need to be connected to the MCU's interrupt input pins respectively. The core components of the EDFA amplifier circuit module are either Finisar FBA-28 series (such as FBA-28-15) or NeoPhotonics NPD-3500 models.

[0034] The implementation principle of an optical amplification and multiplexing / demultiplexing circuit for a convergence / splitting device according to an embodiment of this application is as follows: The MCU control chip establishes bidirectional communication with the WSS device and the EDFA amplification circuit module through a UART interface, and interacts with an external network controller through the SPI protocol, replacing the inefficient mode of hardware-fixed wavelengths and manual fiber patching in traditional solutions. The MCU chip sends a wavelength routing table to the WSS device, for example, configuring the cross-connection relationship of a 22×22 optical switch matrix to achieve optical signal routing from any input port to the output port. Simultaneously, the WSS device periodically transmits optical power monitoring values, and the MCU chip communicates with the EDFA module, enabling the MCU to send gain / output power commands to the EDFA via UART. The Wavelength Selective Switch (WSS) module uses an optical cross-connect matrix (such as a 22×22 port) with a diffraction grating as its core. The optical signal at the input port is split by the diffraction grating and then selected by the optical switch array (switching time ≤10ms) according to the MCU instructions to the target output port. It supports "any wavelength can be added or removed from any port". There is no need to pre-configure a fixed hardware link for each wavelength / service. When adding a new wavelength or service path, only the routing table issued by the MCU needs to be modified. Each output port is equipped with a 0.1dB precision optical attenuator (such as a MEMS optical attenuator). The MCU dynamically adjusts the attenuation value according to the returned optical power value, which solves the nonlinear effect caused by uneven power after multi-wavelength combining. It replaces the coarse mode of fixed couplers and manual adjustment of attenuators in traditional solutions.

[0035] Example 2 This application also discloses an optical amplification and multiplexing / splitting device for a convergence and splitting equipment.

[0036] An optical amplification and multiplexing / splitting device for a convergence and splitting equipment includes a housing and a circuit board. The circuit board is disposed in the housing and carries an optical amplification and multiplexing / splitting circuit for the convergence and splitting equipment.

[0037] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An optical amplification and combining / splitting circuit for a converging shunt device, characterized by, It includes an MCU control module, a wavelength selective switch module, an EDFA amplifier circuit module, and a power supply module for providing operating voltage to each module. The wavelength selective switch module establishes a communication connection with the MCU control module through a serial interface, the EDFA amplifier circuit module establishes a communication connection with the MCU control module through a serial interface, and the MCU control module establishes data interaction with an external network controller through the SPI protocol.

2. The optical amplification and multiplexing / demultiplexing circuit for a converging deconverging device according to claim 1, wherein The wavelength selective switch module includes a WSS device, which includes a +5V WSS power line connected to the power module, a WSS_RX receiving line and a WSS_TX transmitting line that establish a communication connection with the serial interface of the MCU control module.

3. The optical amplification and multiplexing / splitting circuit for a converging / splitting device according to claim 2, characterized in that, The wavelength selective switch module also includes a diffraction grating or an arrayed waveguide grating, the output of which is connected to an optical switch array, and each output port of the optical switch array is equipped with an optical attenuator.

4. The optical amplification and multiplexing / splitting circuit for a converging / splitting device according to claim 3, characterized in that, The optical switch array is configured as a 22×22 optical cross-connect matrix, the adjustment accuracy of the optical attenuator reaches 0.1dB, and the switching time of the optical switch array is ≤10ms.

5. The optical amplification and multiplexing / splitting circuit for a converging / splitting device according to claim 1, characterized in that, The MCU control module includes an MCU chip, which is connected to a crystal oscillator circuit and a power filter circuit. The crystal oscillator circuit includes a crystal oscillator Y1 and a crystal capacitor, and the power filter circuit includes an inductor L1 and a power filter capacitor.

6. The optical amplification and multiplexing / splitting circuit for a converging / splitting device according to claim 1, characterized in that, The MCU control module establishes communication with the EDFA_RX signal input pin and EDFA_TX signal output pin of the EDFA amplifier circuit module through a serial interface.

7. The optical amplification and multiplexing / splitting circuit for a converging / splitting device according to claim 1, characterized in that, The power module includes a power chip, the VIN pin of which receives a 12V external power supply. The input terminal of the power chip is connected to an input filter capacitor bank, and the output terminal of the power chip is connected to an output filter capacitor bank.

8. The optical amplification and multiplexing / splitting circuit for a converging / splitting device according to claim 7, characterized in that, The input filter capacitor bank includes a first input filter capacitor, a second input filter capacitor, and a third input filter capacitor connected in parallel; the output filter capacitor bank includes a first output filter capacitor, a second output filter capacitor, and a third output filter capacitor connected in parallel.

9. An optical amplification and multiplexing / splitting device for a convergence and splitting equipment, characterized in that, The device includes a housing and a circuit board, the circuit board being disposed in the housing and carrying an optical amplification and multiplexing / splitting circuit for a convergence and splitting device as described in any one of claims 1 to 8.

Images