CN211531236U

CN211531236U - Single-fiber four-way 10G passive optical network adopting SFP OLT optical module

Info

Publication number: CN211531236U
Application number: CN202020214204.6U
Authority: CN
Inventors: 王桥; 伍林; 张向辉; 熊福胜; 具佶勋; 王四俊
Original assignee: Shenzhen Lizi Photoelectric Technology Co ltd
Current assignee: Shenzhen Lizi Photoelectric Technology Co ltd
Priority date: 2020-02-26
Filing date: 2020-02-26
Publication date: 2020-09-18
Anticipated expiration: 2030-02-26

Abstract

The utility model discloses an adopt SFP OLT optical module single fiber quadriversal 10G passive optical network, including singlechip MCU, 0V to-2V bias voltage circuit, slow start power, first laser drive and receive limit discharge circuit, second laser drive circuit, first avalanche voltage control circuit, second avalanche voltage control circuit, semiconductor cooler control circuit and single fiber quadriversal optical component; the single chip microcomputer MCU is respectively connected with the semiconductor refrigerator control circuit, the first laser driving and receiving limiting and discharging circuit and the second laser driving circuit, a slow start power supply provides electric energy for the whole optical module, a golden finger interface is arranged on the optical module, and the single chip microcomputer MCU is communicated with an external system through input and output of other state signals; the utility model discloses be favorable to terminal transmission system's transition to upgrade, reduce communication equipment and circuit and lay the cost, bias voltage circuit's independent design reduces the space of circuit floorslab, has realized 0V to-2V voltage adjustable circuit, and the network deployment is simple, nimble.

Description

Single-fiber four-way 10G passive optical network adopting SFP OLT optical module

Technical Field

The utility model relates to an optical communication technical field especially involves an adopt SFP OLT optical module single fiber quadriversal 10G passive optical network.

Background

A PON (passive optical network) network is composed of an OLT (optical line terminal), an ONU (optical network unit), and a 0DN (optical distribution network) connected between the OLT and the ONU, and has become the mainstream of an access network technology worldwide because the PON network technology has significant advantages of high performance, low operation and maintenance cost, and the like;

the GPON (gigabit passive optical network) network technology in the current PON network technology is more widely applied, and the downstream center wavelength of the GPON network technology is 1490nm, the upstream center wavelength is 1310m, the downstream rate is 2.488Gbps, and the upstream rate is 1.244 Gbps. With the increase of the demand of users for communication rate, the XGPON (gigabit passive optical network) network technology comes, and "the downstream center wavelength of the XGPON network technology is 1577nm, the upstream center wavelength is 1270nm, the downstream rate is 9.953Gbps, and the upstream rate is 2.488 Gbps. With the increase of the demand of users for communication speed and the continuous reduction of the cost of the XGPON network, the XGPON network is more and more widely applied.

With the popularization and large-scale application of optical fiber communication technology, the maintenance of optical fiber networks becomes a problem. Particularly, when a PON (Passive Optical Network, abbreviated as PON) Network is rapidly developed and expanded to gradually form a large-scale application, the maintenance problem of the Optical fiber cable is gradually exposed and becomes one of the main problems restricting the industrial development, and a general OLT Optical module cannot be compatible with two systems at the same time, is not beneficial to transition upgrade of a terminal transmission system, and can only satisfy 1490nm wavelength of a 2.5G transmission rate and 1310 nm wavelength of a 1.25G reception rate (SFP GPON OLT), or 1577nm wavelength of a 10G transmission rate and 1270nm wavelength of a 10G reception rate (SFP + XGS PON OLT).

Accordingly, the prior art is deficient and needs improvement.

SUMMERY OF THE UTILITY MODEL

The utility model provides an adopt SFP OLT optical module single fiber quadriversal 10G passive optical network, the above-mentioned problem of solution.

In a first aspect, the present invention discloses a technical solution as follows:

a single-fiber four-way 10G passive optical network adopting an SFP OLT optical module is characterized by comprising a single-chip microcomputer MCU, a 0V to-2V bias circuit, a slow start power supply, a first laser driving and receiving limit discharge circuit, a second laser driving circuit, a first avalanche voltage control circuit, a second avalanche voltage control circuit, a semiconductor refrigerator control circuit and a single-fiber four-way optical component; the single chip microcomputer MCU is respectively connected with the semiconductor refrigerator control circuit, the first laser driving and receiving limiting and discharging circuit and the second laser driving circuit, the slow start power supply provides electric energy for the whole optical module, a golden finger interface is arranged on the optical module, and the single chip microcomputer MCU is communicated with an external system through the input and output of the single chip microcomputer MCU and other state signals; one end of the bias circuit from 0V to-2V is connected with a first laser driving and receiving limiting and discharging circuit, the other end of the bias circuit is connected with a single-fiber four-way optical component, the first avalanche voltage control circuit, the conductor refrigerator control circuit, the second laser driving circuit and the second avalanche voltage control circuit are connected with the single-fiber four-way optical component, and the second laser driving circuit is connected with the second avalanche voltage control circuit.

With reference to the first aspect, in a first implementation manner of the first aspect, the slow start power supply is 3.3V, and the optical module accesses a voltage of 3.3V to the slow start circuit through a gold finger to prevent a current surge from being generated at the moment of power-on.

With reference to the first aspect, in a second implementation manner of the first aspect, the voltage value of the 0V-2V bias circuit is 0V to-2V for providing laser operation negative voltage modulation.

With reference to the first aspect, in a third implementation manner of the first aspect, the DAC output and the ADC input of the MCU are used to control and monitor the temperature of the laser through the TEC chip, and the operating temperature of the laser is within a set range.

With reference to the first aspect, in a fourth implementation manner of the first aspect, the first laser driver outputs a high-frequency EML modulation signal of a 10G rate transmission channel, and the high-frequency EML modulation signal passes through a 0V to-2V bias circuit to modulate an EML optical signal, the receiving limiter circuit outputs a 10G rate high-frequency differential electrical signal to the gold finger, the ROSA1 converts the received optical signal into a received high-frequency differential electrical signal and inputs the received high-frequency differential electrical signal to the limiter U1, the receiving limiter circuit outputs a 1G rate high-frequency differential electrical signal to the gold finger when the receiving limiter circuit is used, and the ROSA2 converts the received optical signal into a received high-frequency differential electrical signal and inputs the received high-frequency differential.

With reference to the first aspect, in a fifth implementation form of the first aspect, the first avalanche voltage control circuit and the second avalanche voltage control circuit provide avalanche voltages to the APDs of the respective channels ROSA.

With reference to the first aspect, in a sixth implementation manner of the first aspect, the high-frequency differential electrical signal input and output of the second laser driving circuit are connected to an external system through a gold finger.

With reference to the first aspect, in a seventh implementation manner of the first aspect, a single fiber in the single fiber four-way optical component transmits optical signals in four directions, and two channels transmit and two channels receive four wavelengths.

Further, preferably, the OLT optical module further includes a low-speed transmitter switch and a low-speed receiver switch; the electrical connector includes a power port.

According to the scheme, the SFP OLT optical module single-fiber four-way 10G passive optical network is compatible with the GPON OLT and the XGS PON OLT through the SFP + Combo OLT, can be simultaneously used for the GPON and XGS PON systems in the application process, is beneficial to transition upgrade of a terminal transmission system, reduces laying cost of communication equipment and circuits, is independent of a 0V-2V bias circuit, reduces space of circuit laying, achieves a circuit with adjustable voltage from 0V to-2V, and is simple and flexible in networking, low in network management complexity and low in cost.

Drawings

For a clearer explanation of the embodiments or technical solutions in the prior art, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a single-fiber four-way 10G passive optical network using an SFP OLT optical module;

fig. 2 is a circuit diagram of a single-fiber four-way 10G passive optical network bias circuit using SFP OLT optical modules.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "fixed," "integrally formed," "left," "right," and the like are used for descriptive purposes only and in the drawings, elements having similar structures are identified by the same reference numerals.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As shown in fig. 1, the present disclosure provides an embodiment of the present invention:

a single-fiber four-way 10G passive optical network adopting an SFP OLT optical module is characterized by comprising a single-chip microcomputer MCU, a 0V to-2V bias circuit, a slow start power supply, a first laser driving and receiving limit discharge circuit, a second laser driving circuit, a first avalanche voltage control circuit, a second avalanche voltage control circuit, a semiconductor refrigerator control circuit and a single-fiber four-way optical component; the single chip microcomputer MCU is respectively connected with the semiconductor refrigerator control circuit, the first laser driving and receiving limiting and discharging circuit and the second laser driving circuit, the slow start power supply provides electric energy for the whole optical module, a golden finger interface is arranged on the optical module, and the single chip microcomputer MCU is communicated with an external system through the input and output of the single chip microcomputer MCU and other state signals; one end of the 0V to-2V bias circuit is connected with the first laser driving circuit, the other end of the 0V to-2V bias circuit is connected with the single-fiber four-way optical assembly, the first avalanche voltage control circuit, the semiconductor refrigerator control circuit, the second laser driving circuit and the second avalanche voltage control circuit are connected with the single-fiber four-way optical assembly, and the second laser driving circuit is connected with the second avalanche voltage control circuit.

As shown in fig. 1, in one embodiment, the slow start power supply is 3.3V, and the optical module accesses a voltage of 3.3V to the slow start circuit through a gold finger, so as to prevent a current surge from being generated at the moment of power-on.

In one embodiment, as shown in fig. 1, the voltage of the bias circuit is 0V to-2V for providing negative modulation of the laser operation.

As shown in fig. 1, in one embodiment, the DAC output and the ADC input of the MCU are used to control and monitor the temperature of the laser via the TEC chip, and the operating temperature of the laser is within a set range.

As shown in fig. 1, in one embodiment, the first laser driver outputs a high-frequency EML modulation signal of a 10G rate transmission channel, and the high-frequency EML modulation signal passes through a 0V to-2V bias circuit to modulate an EML optical signal, the receiving limiter circuit outputs a 10G rate high-frequency differential electrical signal to the gold finger, the ROSA1 converts the received optical signal into a received high-frequency differential electrical signal and inputs the received high-frequency differential electrical signal to the limiter U1, the receiving limiter circuit outputs a 1G rate high-frequency differential electrical signal to the gold finger, and the ROSA2 converts the received optical signal into a received high-frequency differential electrical signal and inputs the received high-frequency differential electrical signal to the limiter U1.

In one embodiment, as shown in figure 1, a first avalanche voltage control circuit and a second avalanche voltage control circuit provide avalanche voltages to the APDs of each channel ROSA.

As shown in fig. 1, in one embodiment, the high frequency differential electrical signal input and output of the second laser driving circuit is connected to the external system through a gold finger.

In one embodiment, as shown in fig. 1, a single fiber in a single fiber four-way optical assembly transmits optical signals in four directions, and two channels transmit and two channels receive four wavelengths.

Further, as shown in fig. 2, the 0V to-2V bias circuit includes a diode D2, an optical subassembly TOSA1, a capacitor C27, a capacitor C51, a capacitor C27, an inductor L2, an inductor L16, resistors R17 and R25-R26; the first pin and the third pin of the optical assembly TOSA1 are grounded, the fourth pin of the optical assembly TOSA1 is respectively connected with the second end of the capacitor C51 and the second end of the inductor L16, the capacitor C51 is connected with the laser driving chip U1, the first end of the inductor L16 is respectively connected with the second end of the inductor L2 and the second end of the resistor R17, the first end of the inductor L2 is respectively connected with the first end of the resistor R17, the second end of the resistor R25, the anode of the diode D2 and the first end of the capacitor C27, the second end of the capacitor C27 is grounded, the first end of the diode D2 is negatively connected with the resistor R26, and the second end of the resistor R26 is connected with the laser driving chip.

It should be noted that the above technical features are continuously combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; moreover, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.

Claims

1. A single-fiber four-way 10G passive optical network adopting an SFP OLT optical module is characterized by comprising a single-chip microcomputer MCU, a 0V to-2V bias circuit, a slow start power supply, a first laser driving and receiving limit discharge circuit, a second laser driving circuit, a first avalanche voltage control circuit, a second avalanche voltage control circuit, a semiconductor refrigerator control circuit and a single-fiber four-way optical component; the single chip microcomputer MCU is respectively connected with the semiconductor refrigerator control circuit, the first laser driving and receiving limiting and discharging circuit and the second laser driving circuit, the slow start power supply provides electric energy for the whole optical module, a golden finger interface is arranged on the optical module, and the optical module is communicated with an external system through the input and output of the single chip microcomputer MCU; one end of the 0V to-2V bias circuit is connected with the first laser driving circuit, the other end of the 0V to-2V bias circuit is connected with the single-fiber four-way optical assembly, the first avalanche voltage control circuit, the semiconductor refrigerator control circuit, the second laser driving circuit and the second avalanche voltage control circuit are connected with the single-fiber four-way optical assembly, and the second laser driving circuit is connected with the second avalanche voltage control circuit.

2. The SFP OLT optical module single-fiber four-way 10G passive optical network of claim 1, wherein the slow start power supply is 3.3V, and the optical module accesses 3.3V voltage to the slow start circuit through a golden finger to prevent current surge from being generated at the moment of power-on.

3. The single-fiber four-way 10G passive optical network adopting the SFP OLT optical module as claimed in claim 1, wherein the voltage value of the 0V-2V bias circuit is 0V to-2V for providing laser operation negative voltage modulation.

4. The SFP OLT optical module single-fiber four-way 10G passive optical network as claimed in claim 1, wherein the DAC output and ADC input of the MCU are used for controlling and monitoring the laser temperature through the TEC chip, and the laser working temperature is in a set range.

5. The single-fiber four-way 10G passive optical network adopting the SFP OLT optical module as claimed in claim 1, wherein the first laser driver outputs a high-frequency EML modulation signal of a 10G rate transmission channel to pass through a 0V to-2V bias circuit to be used for modulating an EML optical signal, the receiving limit discharge circuit outputs a 10G rate high-frequency differential electrical signal to the gold finger, the ROSA1 converts the received optical signal into a received high-frequency differential electrical signal to be input to the limit discharge U1, the receiving limit discharge circuit outputs a 1G rate high-frequency differential electrical signal to the gold finger when in use, and the ROSA2 converts the received optical signal into a received high-frequency differential electrical signal to be input to the limit discharge U1.

6. The single-fiber four-way 10G passive optical network adopting the SFP OLT optical module of claim 1, wherein the first avalanche voltage control circuit and the second avalanche voltage control circuit provide avalanche voltages to the APDs of each channel ROSA.

7. The SFP OLT optical module-based single-fiber four-way 10G passive optical network of claim 1, wherein the high-frequency differential electrical signal input and output of the second laser driving circuit is connected to an external system through a golden finger.

8. The SFP OLT optical module-based single-fiber four-way 10G passive optical network of claim 1, wherein a single fiber in the SFP OLT optical module transmits optical signals in four directions, transmits in two channels, and receives in two channels four wavelengths.