An OLT device based on optical module standard package
By using OLT equipment based on optical module standard packaging, the problems of high cost, high power consumption and difficult deployment of existing OLT equipment are solved, realizing low-cost and rapid deployment of XGSPON/XGPON/GPON networks, supporting multi-port and energy-saving design.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN AOTENG OPTOELECTRONICS TECHNOLOGY CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-07-24
AI Technical Summary
Existing XGSPON/XGPON/GPON OLT optical line terminal equipment is costly, consumes a lot of power, is difficult to deploy, and has poor flexibility.
The OLT device adopts a standard optical module package, including a standard SFP+/XFP package shell, SC/LC optical interface, gold finger interface circuit, laser, photodetector, laser drive unit, processing unit, etc., and supports IEEE 802.3 Ethernet switching and ITU-T protocol, realizing modular design.
It enables rapid and low-cost deployment of XGSPON/XGPON/GPON networks on IEEE 802.3 equipment, saving equipment room space and power consumption, supporting multiple ONU and T-CONT ports, and featuring plug-and-play functionality.
Smart Images
Figure CN224555718U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of communication equipment, specifically to an OLT device based on the standard packaging of optical modules. Background Technology
[0002] XGSPON (10-Gigabit-capable Symmetrical Passive Optical Network), based on the ITU-T G.9807.1 protocol; XGPON (10-Gigabit-capable Asymmetric Passive Optical Network), based on the ITU-T G.987.1 protocol; and GPON (Gigabit-capable Passive Optical Network), based on the ITU-T G.984 protocol family, generally consist of three parts: OLT (Optical Line Terminal), ONU (Optical Network Unit), and ODN (Optical Distribution Network). In existing technologies, the XGSPON / XGPON / GPON OLT consists of the following components: physical layer optical modules, boards, and power supply. These functional physical units are then housed in a rack or a single device. This type of product suffers from numerous drawbacks, including high cost, high power consumption, difficult deployment, and inflexibility. Utility Model Content In view of the above-mentioned shortcomings in the prior art, the present invention provides an OLT device based on the standard packaging of optical modules.
[0003] To achieve the aforementioned objectives, the technical solution adopted by this utility model is as follows: An OLT device based on a standard optical module package includes: Standard SFP+ / XFP package; An SC / LC optical interface 1 is located at the front end of the standard SFP+ / XFP package housing; The gold finger interface circuit 8 is located at the rear end of the standard SFP+ / XFP package housing; The standard SFP+ / XFP package housing contains a first laser 2, a first photodetector 3, a first laser drive unit 4, a first burst light receiving circuit 5, a first processing unit 6, a first Ethernet switching processing unit 7, and a second laser 10, a second photodetector 11, a second laser drive unit 12, a second burst light receiving circuit 13, a second processing unit 14, and a second Ethernet switching processing unit 15. All of these components are connected to the device control unit 9.
[0004] Furthermore, the SC / LC optical interface 1 is connected to the first laser 2, the second laser 10, the first photodetector 3, and the second photodetector 11 via an optical fiber channel; The output end of the first laser 2 is connected to the modulation end of the first laser driving unit 4, and the output end of the second laser 10 is connected to the modulation end of the second laser driving unit 12. The output terminal of the first photodetector 3 is connected to the input terminal of the first burst light receiving circuit 5, and the output terminal of the second photodetector 11 is connected to the input terminal of the second burst light receiving circuit 13. The control terminal of the first laser driving unit 4 and the output terminal of the first burst light receiving circuit 5 are respectively connected to the first processing unit 6; the control terminal of the second laser driving unit 12 and the output terminal of the second burst light receiving circuit 13 are respectively connected to the first processing unit. The data terminal of the first processing unit 6 is connected to the first Ethernet switching processing function unit 7 and to the gold finger interface circuit 8; the data terminal of the second processing unit 14 is connected to the second Ethernet switching processing function unit 15 and to the gold finger interface circuit 8.
[0005] Furthermore, the first laser 2 is an electro-absorption modulated laser with a wavelength of 1577nm, and the second laser 10 is a distributed feedback laser with a wavelength of 1490nm. Both are packaged in a TO-56 or similar TO package, and an MPD detector is integrated within the package.
[0006] Furthermore, the first photodetector (3) is a 10G APD avalanche diode, and the second photodetector 11 is a 1.25G APD avalanche diode. Both are packaged in a TO-46 or similar TO package, and a transimpedance amplifier is integrated within the package.
[0007] Furthermore, the first laser driving unit 4 and the second laser driving unit 12 include an input buffer, a pre-driving circuit and a driving output circuit connected in series, and integrate an automatic power control circuit, a digital control unit and an error alarm unit.
[0008] This utility model has the following beneficial effects: 1. XGSPON / XGPON / GPON network deployment can be achieved on IEEE 802.3 compliant devices (such as ordinary Ethernet switches) without the need for traditional OLT equipment. It is plug-and-play, fast, and low-cost.
[0009] 2. Saves server room space and power consumption, and is green and low-carbon. Attached Figure Description
[0010] Figure 1 This is a functional block diagram of the OLT device based on the standard packaging of optical modules according to this utility model. Detailed Implementation
[0011] The specific embodiments of this utility model are described below to enable those skilled in the art to understand this utility model. However, it should be understood that this utility model is not limited to the scope of the specific embodiments. For those skilled in the art, as long as various changes are within the spirit and scope of this utility model as defined and determined by the appended claims, these changes are obvious. All utility model creations utilizing the concept of this utility model are within the scope of protection.
[0012] An OLT device based on a standard optical module package, such as Figure 1 As shown, it includes: Standard SFP+ / XFP package; An SC / LC optical interface 1 is located at the front end of the standard SFP+ / XFP package housing; The gold finger interface circuit 8 is located at the rear end of the standard SFP+ / XFP package housing; The standard SFP+ / XFP package housing contains a first laser 2, a first photodetector 3, a first laser drive unit 4, a first burst light receiving circuit 5, a first processing unit 6, a first Ethernet switching processing unit 7, and a second laser 10, a second photodetector 11, a second laser drive unit 12, a second burst light receiving circuit 13, a second processing unit 14, and a second Ethernet switching processing unit 15. All of these components are connected to the device control unit 9.
[0013] In this embodiment, the product adopts a standard SFP+ / XFP form factor, the optical interface uses SC / LC, and the electrical interface uses a standard SFP+ / XFP interface. It can be directly plugged into the industry-standard SFP+ / XFP socket to provide power, IIC management interface, and data transmission interface to the product.
[0014] The high-speed data interface uses XGMII / SGMII / HSGMII / GBIC(SERDES) interfaces.
[0015] The module internally includes a laser, a photodetector, a laser driver, a burst light receiver, a burst light power monitoring unit, a control unit, and an XGSPON / XGPON / GPON MAC processing and management unit that conforms to the ITU-T G.9807.1, ITU-T G.987.1 and ITU-T G.984.x protocol specifications, with Ethernet processing and forwarding functions based on IEEE 802.3.
[0016] It supports applications with up to 128 ONUs (Optical Network Units), 1024 T-CONTs (Transmission Containers), 4096 GEM ports, and a transmission distance of 60km.
[0017] Standard LC / FC optical port 1: Enables connection to an external fiber optic interface, which can be LC / SC or other standard fiber optic interfaces. This port is used to connect to the ODN, and the ODN to the CPE. This establishes the fiber optic connection between the device and the CPE.
[0018] Lasers 2 and 10: These convert high-speed electrical signals into NRZ optical signals. In this design, a 1577nm electro-absorption modulated laser and a 1490nm distributed feedback laser are used. According to design requirements and ITU specifications, the 1577nm laser must have a wavelength range of 1575~1580nm, with various optical power specifications; the 1490nm laser must have a wavelength range of 1480~1500nm, a side-mode rejection ratio greater than 30dB, a -20dB spectral width less than 1nm, and various optical power specifications. Lasers 2 and 10 are packaged in a TO-56 or other TO type. To facilitate monitoring of the laser's performance over its lifetime, an MPD detector is packaged inside the TO. To reduce power consumption, high-efficiency chips are selected for the lasers, and the 1577nm electro-absorption modulated laser 2 uses an aspherical lens package.
[0019] Photodetectors 3 and 11: These convert optical signals into electrical signals. This design uses a 10G APD avalanche diode 3 and a 1.25G APD avalanche diode 11, which offer high sensitivity. The photodetectors are packaged in a TO-46 or other TO type. To further enhance sensitivity, a burst receiver TIA (transimpedance amplifier) is included in this TO to convert the burst optical signal generated by the ONU into a burst electrical signal.
[0020] Laser driver units 4 and 12 convert high-speed electrical signals into electrical signals suitable for driving the laser. These units include an input buffer, a pre-drive circuit, a drive output circuit, automatic power control, a digital control unit, and an error alarm unit. In laser driver units 4 and 12, the differential digital signal is AC-coupled to the input buffer. This buffer circuit amplifies and shapes the signal, and then the pre-drive circuit drives the output circuit to generate a signal suitable for driving the laser. This signal is a programmable current modulation signal and a bias current, which are provided to the laser. Simultaneously, the automatic power control circuit monitors the laser's emission power through an MPD detector and controls the magnitude of the modulation signal and bias current through the digital control unit, ensuring that the optical power remains within a normal range throughout the product's lifespan. The error alarm unit generates an alarm signal by monitoring the current and optical power levels.
[0021] Burst receiving units 5 and 13: These units amplify and shape burst signals. They mainly include AC coupling capacitors, a discharge switch network, a burst signal detection circuit, and a reset circuit. They perform DC component elimination, noise reduction, eye diagram crossover point adjustment, CML output, reset signal pulse widening, and reset time adjustment. The signal output from the TIA enters the discharge switch network via AC coupling. The reset signal from the MAC quickly establishes a common-mode level, eliminating the DC component. The AC signal with the eliminated DC component is detected and amplified to generate SD and data signals, which are then output to the MAC processing unit via eye diagram crossover point adjustment and CML drive current. Due to the short reset signal duration, internal adjustments to the reset signal pulse widening and reset time improve sensitivity.
[0022] The G.9807 OLT MAC processing unit 6 implements MAC processing functions for XGSPON / XGPON, controlling CPE online / offline status, bandwidth allocation, priority allocation, and other functions. This XGSPON / XGPON MAC conforms to the ITU-T G.9807.1 / G.987.1 protocol, supports downlink rates of 9.95328Gbps and uplink rates of 9.95328Gbps / 2.48832Gbps, with a maximum split ratio of 1:128. It supports 128 ONUs registering and transmitting services, and supports 1024Tcont and 4096Gemport. To improve power budget, it supports bidirectional FEC RS(255,239) error correction coding. It provides communication interfaces such as PLOAM, OMCI, OAM, and Ethernet, and manages the internal PLOAM channel through the MCU. In addition, the OMCI channel has two control modes: one manages the transmission and reception of the A-standard OMCI channel internally through the MCU, and the other controls the transmission and reception of the OMCI channel by sending and receiving Ethernet messages of a specific format through the reserved in-band management channel in the uplink port. The PON MAC supports ONU-based status statistics, including various ONU alarm indications, bandwidth management and TCONT allocation, GEM PORT mapping, and other service information and status reporting. The PON MAC can monitor and detect rogue ONUs and report and shut down controllable rogue ONUs, and supports rapid configuration of AES encryption based on GEM PORT. The PON MAC also has dynamic bandwidth allocation management (DBA) and software DBA control management, supporting the configuration of flexible bandwidth types T1~T5 in the ITU-T standard protocol.
[0023] The G.984 OLT MAC processing unit 14 implements the GPON MAC processing function, controlling CPE online / offline status, bandwidth allocation, priority allocation, and other functions. This GPON MAC conforms to the ITU-T G.984.x protocol, supports a downlink rate of 2.48832 Gbit / s and an uplink rate of 1.24416 Gbit / s, a maximum split ratio of 1:128, supports 128 ONUs registering and transmitting services, and supports 1024 Tcont and 4096 Gemport. To improve power budget, it supports bidirectional FEC RS (255,239) error correction coding. It provides communication interfaces such as PLOAM, OMCI, OAM, and Ethernet, and manages the internal PLOAM channel through the MCU. The OMCI channel has two control modes: one manages the transmission and reception of the A-standard OMCI channel internally through the MCU, and the other controls the transmission and reception of the OMCI channel by sending and receiving Ethernet messages of a specific format through the reserved in-band management channel in the uplink port. The PON MAC supports ONU-based status statistics, including various ONU alarm indications, bandwidth management and TCONT allocation, GEM PORT mapping, and other service information and status reporting. The PON MAC can monitor and detect rogue ONUs and report and shut down controllable rogue ONUs, supporting rapid configuration of AES encryption based on GEM PORT. The PON MAC also features Dynamic Bandwidth Allocation Management (DBA) and software DBA control management, supporting the configuration of flexible bandwidth types T1 to T5 in the ITU-T standard protocol.
[0024] Ethernet switching processing functions 7 and 15: This section processes CPE data services through the MAC processing unit, then transmits CPE service and control data via Ethernet packets using GE / 2.5GE / 10GE. It supports the IEEE 802.3 standard, XGMII (10GE) interface / HSGMII (2.5GE) interface / SGMII (GE) interface, supports auto-negotiation or forced GE / 2.5GE / 10GE mode, supports Ethernet packet lengths of 64~1536 bytes, supports bidirectional link (TX / RX) control settings and status queries, and supports bidirectional statistical queries for various packet lengths (64 / 65~127 / … / 1024~1518 / 1519 bytes and above).
[0025] The gold finger interface circuit 8 meets the SFP+ / XFP protocol specifications and is compliant with SGMII / HSGMII / GBIC (SERDES) / XGMII (SERDES) interface. This enables power supply / control / service switching with the switch.
[0026] The equipment control unit 9 controls the entire product's operation and configuration: optical transceiver control, network management configuration. This equipment allows for convenient and rapid field deployment via the control unit. a: The default configuration method does not require additional network management control, and can realize ONU online and service activation, truly achieving plug and play.
[0027] b: Professional configuration method, users can perform customized configuration through the Layer 2 and Layer 3 interfaces provided by the device control unit to complete service activation, such as bandwidth allocation, service priority configuration, etc.
[0028] Users can configure the following settings through the device control unit: ONU online and offline, laser shutdown, gold finger interface selection, MAC address configuration, alarm masking, and service-related configurations.
[0029] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.
[0030] Those skilled in the art will recognize that the embodiments described herein are intended to help the reader understand the principles of this invention, and should be understood that the scope of protection of this invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on these technical teachings disclosed in this invention without departing from the essence of this invention, and these modifications and combinations are still within the scope of protection of this invention.
Claims
1. An OLT device based on a standard optical module package, characterized in that, include: Standard SFP+ / XFP package; An SC / LC optical interface (1) is located at the front end of the standard SFP+ / XFP package housing. The gold finger interface circuit (8) is located at the rear end of the standard SFP+ / XFP package housing. The standard SFP+ / XFP package contains a first laser (2), a first photodetector (3), a first laser drive unit (4), a first burst light receiving circuit (5), a first processing unit (6), a first Ethernet switching processing unit (7), and a second laser (10), a second photodetector (11), a second laser drive unit (12), a second burst light receiving circuit (13), a second processing unit (14), and a second Ethernet switching processing unit (15). The first laser (2), the first photodetector (3), the first laser drive unit (4), the first burst light receiving circuit (5), the first processing unit (6), the first Ethernet switching processing unit (7), the second laser (10), the second photodetector (11), the second laser drive unit (12), the second burst light receiving circuit (13), the second processing unit (14), and the second Ethernet switching processing unit (15) are all connected to the device control unit (9).
2. The OLT device based on standard optical module packaging according to claim 1, characterized in that, The SC / LC optical interface (1) is connected to the first laser (2), the second laser (10), the first photodetector (3), and the second photodetector (11) via an optical fiber channel. The output end of the first laser (2) is connected to the modulation end of the first laser driving unit (4), and the output end of the second laser (10) is connected to the modulation end of the second laser driving unit (12); The output terminal of the first photodetector (3) is connected to the input terminal of the first burst light receiving circuit (5), and the output terminal of the second photodetector (11) is connected to the input terminal of the second burst light receiving circuit (13). The control terminal of the first laser driving unit (4) and the output terminal of the first burst light receiving circuit (5) are respectively connected to the first processing unit (6); the control terminal of the second laser driving unit (12) and the output terminal of the second burst light receiving circuit (13) are respectively connected to the first processing unit; The data terminal of the first processing unit (6) is connected to the first Ethernet switching processing function unit (7) and to the gold finger interface circuit (8); the data terminal of the second processing unit (14) is connected to the second Ethernet switching processing function unit (15) and to the gold finger interface circuit (8).
3. The OLT device based on the standard optical module packaging according to claim 1, characterized in that, The first laser (2) is an electro-absorption modulated laser with a wavelength of 1577nm, and the second laser (10) is a distributed feedback laser with a wavelength of 1490nm. Both are packaged in a TO-56 or similar TO package, and an MPD detector is integrated in the package.
4. The OLT device based on the standard optical module packaging according to claim 1, characterized in that, The first photodetector (3) is a 10G APD avalanche diode, and the second photodetector (11) is a 1.25G APD avalanche diode. Both are packaged in a TO-46 or similar TO package, and a transimpedance amplifier is integrated in the package.
5. The OLT device based on the standard optical module packaging according to claim 1, characterized in that, The first laser driving unit (4) and the second laser driving unit (12) include an input buffer, a pre-driving circuit and a driving output circuit connected in series, and integrate an automatic power control circuit, a digital control unit and an error alarm unit.