A single-fiber four-way 10G passive optical network using SFP OLT optical module

Abstract

The invention discloses a single-fiber four-way 10G passive optical network using an SFP OLT optical module, comprising a single-chip microcomputer MCU, a 0V to 2V bias circuit, a slow-start power supply, a first laser drive and receiving limiting circuit, a second laser drive 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 drive and receiving limiting circuit and the second laser drive circuit; the slow-start power supply provides electric energy for the entire optical module; a gold finger interface is provided on the optical module, and the single-chip microcomputer MCU and other state signal input and output communicate with an external system; the invention is conducive to the transition upgrade of a terminal transmission system, reduces the cost of laying communication equipment and lines, the independent design of the bias circuit reduces the space of the circuit board, realizes a 0V to 2V voltage adjustable circuit, and the networking is simple and flexible.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to a single-fiber four-way 10G passive optical network using an SFP+ OLT optical module. Background Art

[0002] PON (Passive Optical Network) network consists of OLT (Optical Line Terminal), ONU (Optical Network Unit) and ODN (Optical Distribution Network) connected between OLT and ONU. Due to the significant advantages of PON network technology such as high performance and low operation and maintenance costs, it has become the mainstream access network technology worldwide.

[0003] Among the current PON network technologies, GPON (Gigabit Passive Optical Network) network technology is more widely used. The downstream center wavelength of GPON network technology is 1490nm, the upstream center wavelength is 1310nm, the downstream rate is 2.488Gbps, and the upstream rate is 1.244Gbps. With the growth of user demand for communication speed, XGPON (10 Gigabit Passive Optical Network) network technology came into being. The downstream center wavelength of XGPON network technology is 1577nm, and the upstream center wavelength is 1270nm. The downstream rate is 9.953Gbps and the upstream rate is 2.488Gbps. With the growth of user demand for communication speed and the continuous decline of XGPON network costs, XGPON network applications will become more and more widespread.

[0004] With the popularization and large-scale application of optical fiber communication technology, the maintenance of optical fiber network has become a problem. Especially when the PON (Passive Optical Network, referred to as PON) network is rapidly developing and expanding, and gradually forming large-scale applications, the maintenance problem of optical fiber cable has gradually been exposed, and has become one of the main problems restricting the development of the industry. The general OLT optical module cannot be compatible with two systems at the same time, which is not conducive to the transition and upgrade of the terminal transmission system. It can only meet the 2.5G transmission rate 1490nm wavelength and 1.25G receiving rate 1310 wavelength (SFP GPON OLT), or 10G transmission rate 1577nm wavelength and 10G receiving rate 1270nm wavelength (SFP+ XGS PON OLT).

[0005] Therefore, the prior art has defects and needs to be improved. Summary of the invention

[0006] The present invention provides a single-fiber four-way 10G passive optical network using an SFP+ OLT optical module to solve the above problems.

[0007] In the first aspect, the technical solution provided by the present invention is as follows:

[0008] A single-fiber four-way 10G passive optical network using an SFP OLT optical module is characterized in that it includes a single-chip microcomputer MCU, a 0V to -2V bias circuit, a slow-start power supply, a first laser drive and receiving limiting circuit, a second laser drive 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 to the semiconductor refrigerator control circuit, the first laser drive and receiving limiting circuit, and the second laser drive circuit; the slow-start power supply provides electric energy for the entire optical module; a gold finger interface is provided on the optical module, and the module communicates with an external system through the single-chip microcomputer MCU and the input and output of other status signals; one end of the 0V to -2V bias circuit is connected to the first laser drive and receiving limiting circuit, and the other end is connected to the single-fiber four-way optical component; the first avalanche voltage control circuit, the conductor refrigerator control circuit, the second laser drive circuit and the second avalanche voltage control circuit are connected to the single-fiber four-way optical component, and the second laser drive circuit is connected to the second avalanche voltage control circuit.

[0009] In combination with the first aspect, in a first implementation of the first aspect, the slow-start power supply is 3.3V, and the optical module is connected to the slow-start circuit via a gold finger to connect the 3.3V voltage to prevent a current surge from being generated at the moment of power-on.

[0010] In combination with the first aspect, in a second implementation of the first aspect, a voltage value of the 0V-2V bias circuit is 0V to -2V, which is used to provide negative voltage modulation for laser operation.

[0011] In combination with the first aspect, in a third implementation of the first aspect, the DAC output and ADC input of the single-chip microcomputer MCU are used to control and monitor the laser temperature through the TEC chip, and the laser operating temperature is within a set range.

[0012] In combination with the first aspect, in a fourth implementation of the first aspect, the first laser driver outputs a high-frequency EML modulation signal of a 10G rate transmission channel, which is used to modulate the EML optical signal after passing through a 0V to -2V bias circuit, and the receiving limiting circuit outputs the 10G rate high-frequency differential electrical signal to the gold finger, and ROSA1 converts the received optical signal into a received high-frequency differential electrical signal and inputs it into the limiting amplifier U1. When used, the receiving limiting circuit outputs the 1G rate high-frequency differential electrical signal to the gold finger, and ROSA2 converts the received optical signal into a received high-frequency differential electrical signal and inputs it into the limiting amplifier U1.

[0013] In combination with the first aspect, in a fifth implementation of the first aspect, the first avalanche voltage control circuit and the second avalanche voltage control circuit provide an avalanche voltage to the APD of the ROSA of each channel.

[0014] In combination with the first aspect, in a sixth implementation 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.

[0015] In combination with the first aspect, in a seventh implementation of the first aspect, a single-fiber four-way optical component transmits optical signals in four directions, with two channels transmitting and two channels receiving four wavelengths.

[0016] Further, preferably, the OLT optical module also includes a low-speed transmitting switch and a low-speed receiving switch; and the electrical connector includes a power port.

[0017] One of the above solutions adopts a single-fiber four-way 10G passive optical network using an SFP+ OLT optical module. It is compatible with GPON OLT and XGS PON OLT through SFP+ ComboOLT. It can be used for both GPON and XGS PON systems during application, which is beneficial to the transition upgrade of terminal transmission systems and reduces the cost of communication equipment and line laying. The independent design of the 0V-2V bias circuit reduces the space for circuit layout and realizes a 0V to -2V voltage adjustable circuit. The networking is simple and flexible, and the network management is less complex and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a single-fiber four-way 10G passive optical network using SFP+ OLT optical module is invented;

[0020] Figure 2 The invention discloses a circuit structure diagram of a single-fiber four-way 10G passive optical network bias circuit using an SFP+ OLT optical module. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "fixed", "integrally formed", "left", "right" and similar expressions used in this specification are for illustrative purposes only. In the drawings, units with similar structures are marked with the same reference numerals.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0024] like Figure 1 As shown, an embodiment provided by the present invention is:

[0025] A single-fiber four-way 10G passive optical network using an SFP+ OLT optical module is characterized in that it includes a single-chip microcomputer MCU, a 0V to -2V bias circuit, a slow-start power supply, a first laser drive and receiving limiting circuit, a second laser drive 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 to the semiconductor refrigerator control circuit, the first laser drive and receiving limiting circuit and the second laser drive circuit, the slow-start power supply provides electric energy for the entire optical module, the optical module is provided with a gold finger interface, and communicates with an external system through the single-chip microcomputer MCU and the input and output of other status signals; one end of the 0V to -2V bias circuit is connected to the first laser drive circuit, and the other end is connected to the single-fiber four-way optical component, the first avalanche voltage control circuit, the semiconductor refrigerator control circuit, the second laser drive circuit and the second avalanche voltage control circuit are connected to the single-fiber four-way optical component, and the second laser drive circuit is connected to the second avalanche voltage control circuit.

[0026] like Figure 1 As shown, in one embodiment, the slow-start power supply is 3.3V, and the optical module is connected to the slow-start circuit via a gold finger to prevent a current surge at the moment of power-on.

[0027] like Figure 1 As shown, in one of the embodiments, the voltage value of the bias circuit is 0V to -2V, which is used to provide negative voltage modulation for laser operation.

[0028] like Figure 1As shown, in one embodiment, the DAC output and ADC input of the single-chip microcomputer MCU are used to control and monitor the laser temperature through the TEC chip, and the laser operating temperature is within the set range.

[0029] like Figure 1 As shown, in one embodiment, the first laser driver outputs a high-frequency EML modulation signal of a 10G rate transmission channel, which is used to modulate the EML optical signal after passing through a 0V to -2V bias circuit. The receiving limiting circuit outputs the 10G rate high-frequency differential electrical signal to the gold finger, and ROSA1 converts the received optical signal into a received high-frequency differential electrical signal and inputs it into the limiting amplifier U1. When used, the receiving limiting circuit outputs the 1G rate high-frequency differential electrical signal to the gold finger, and ROSA2 converts the received optical signal into a received high-frequency differential electrical signal and inputs it into the limiting amplifier U1.

[0030] like Figure 1 As shown, in one embodiment, the first avalanche voltage control circuit and the second avalanche voltage control circuit provide an avalanche voltage to the APD of each channel ROSA.

[0031] like Figure 1 As shown, in one embodiment, the high-frequency differential electrical signal input and output of the second laser driving circuit are connected to the external system through gold fingers.

[0032] like Figure 1 As shown, in one embodiment, a single fiber in a single fiber four-way optical component transmits optical signals four-way, with two channels transmitting and two channels receiving four wavelengths.

[0033] like Figure 2 Further, the 0V to -2V bias circuit includes a diode D2, an optical component TOSA1, a capacitor C27, a capacitor C51, a capacitor C27, an inductor L2, an inductor L16, resistors R17 and R25-R26; pins one and three of the optical component TOSA1 are grounded, pin four of the optical component TOSA1 is respectively connected to the second end of the capacitor C51 and the second end of the inductor L16, the capacitor C51 is connected to the laser driver chip U1, the first end of the inductor L16 is respectively connected to 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 to the first end of the resistor R17, the second end of the resistor R25, the positive electrode of the diode D2 and the first end of the capacitor C27, the second end of the capacitor C27 is grounded, the negative end of the diode D2 is connected to the first end of the resistor R26, and the second end of the resistor R26 is connected to the laser driver chip.

[0034] It should be noted that the above-mentioned technical features are further combined with each other to form various embodiments not listed above, which are all deemed to be within the scope of the present invention; and, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A single-fiber four-way 10G passive optical network using SFP+OLT optical module, characterized in that: The optical module comprises a single-chip microcomputer MCU, a 0V to -2V bias circuit, a slow-start power supply, a first laser drive and receiving limiting circuit, a second laser drive 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 to the semiconductor refrigerator control circuit, the first laser drive and receiving limiting circuit and the second laser drive circuit, the slow-start power supply provides electric energy for the entire optical module, the optical module is provided with a gold finger interface, and communicates with an external system through the single-chip microcomputer MCU and the input and output of other status signals; one end of the 0V to -2V bias circuit is connected to the first laser drive and receiving limiting circuit, and the other end is connected to the single-fiber four-way optical component, the first avalanche voltage control circuit, the semiconductor refrigerator control circuit, the second laser drive circuit and the second avalanche voltage control circuit are connected to the single-fiber four-way optical component, and the second laser drive circuit is connected to the second avalanche voltage control circuit; The 0V to -2V bias circuit includes a diode D2, an optical component TOSA1, a capacitor C27, a capacitor C51, a capacitor C27, an inductor L2, an inductor L16, resistors R17 and R25-R26; pins 1 and 3 of the optical component TOSA1 are grounded, pin 4 of the optical component TOSA1 is respectively connected to the second end of the capacitor C51 and the second end of the inductor L16, the capacitor C51 is connected to the laser driver chip U1, the first end of the inductor L16 is respectively connected to 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 to the first end of the resistor R17, the second end of the resistor R25, the positive electrode of the diode D2 and the first end of the capacitor C27, the second end of the capacitor C27 is grounded, the negative end of the diode D2 is connected to the first end of the resistor R26, and the second end of the resistor R26 is connected to the laser driver chip; The slow-start power supply is 3.3V, and the optical module is connected to the slow-start circuit via a gold finger to prevent current surges at the moment of power-on. The voltage value of the 0V to -2V bias circuit is 0V to -2V, which is used to provide negative voltage modulation for laser operation; The DAC output and ADC input of the single-chip microcomputer 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 the set range; The first laser driving and receiving limiting circuit outputs a high-frequency EML modulation signal of a 10G rate transmission channel, which is used to modulate an EML optical signal after passing through a 0V to -2V bias circuit. The receiving limiting circuit outputs a 10G rate high-frequency differential electrical signal to the gold finger, and ROSA1 converts the received optical signal into a received high-frequency differential electrical signal and inputs it into the limiting circuit U1. The receiving limiting circuit outputs a 1G rate high-frequency differential electrical signal to the gold finger, and ROSA2 converts the received optical signal into a received high-frequency differential electrical signal and inputs it into the limiting circuit U1. The first avalanche voltage control circuit and the second avalanche voltage control circuit provide an avalanche voltage to the APD of the ROSA of each channel; The high-frequency differential electrical signal input and output on the second laser driving circuit are connected to an external system through gold fingers; The single-fiber four-way optical component transmits optical signals in four directions, with two channels transmitting and two channels receiving four wavelengths.

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