CN202121585U

CN202121585U - SFP double-fiber module circuit with selectable boost and digital diagnosis functions

Info

Publication number: CN202121585U
Application number: CN201120238781XU
Authority: CN
Inventors: 刘万润; 侯平顺
Original assignee: WUHAN FIBERPON TECHNOLOGY Co Ltd
Current assignee: WUHAN FIBERPON TECHNOLOGY Co Ltd
Priority date: 2011-07-08
Filing date: 2011-07-08
Publication date: 2012-01-18
Anticipated expiration: 2021-07-08

Abstract

The utility model relates to an SFP double-fiber module circuit with selectable boost and digital diagnosis functions. A laser chip is respectively connected with the two feet positions of an SFP connector and a laser to form a loop; a detector defined chip is respectively connected with the two feet positions of the SFP connector and an avalanche photo diode APD detector to form a loop; an electronically erasable programmable memory chip EEPROM is connected with the SFP connector to form a loop; the chip boosting 3.3 V to 48 V required by the avalanche photo diode APD is connected with the SFP connector through the digital diagnosis function chip to form a loop; the APD detector is additionally provided with a voltage monitoring feet position; the feet position is connected with the output terminal of the chip boosting 3.3 V to 48 V required by the avalanche photo diode APD; and the feet position of the digital diagnosis function chip is compatible and connected with the feet position of EEPROM. In the utility model, the compatible function in integration aspect is combined, not only is the board manufacturing cost is saved in PCB board manufacturing, but also the familiarity of the production personnel to the board is enhanced, thereby the production efficiency is enhanced, the management cost is minimized, and the product advantage is further demonstrated.

Description

The two fiber modules of a kind of SFP are optional boost circuit with the numerical diagnostic function

Technical field

The utility model is mainly used in optical fiber communication and Network Transmission; Relate to the hot-swappable light transceiving integrated module of miniaturization; Hereinafter to be referred as SFP optical transceiver module (Small Form Factor Pluggable Module), the two fiber modules of particularly a kind of SFP are optional boost circuit with the numerical diagnostic function.

Background technology

Along with the development of optical fiber communication industry in recent years, photoelectric conversion module is used also more and more, and equipment vendor is to the compatible integrated performance of optical transceiver module, and transmission range requires also increasingly high.The integrated module of optical transceiver has become from simple photoelectric converting function originally to develop into intelligent digital diagnosis monitoring function; And transmission range is by the 10KM of beginning, and 20KM develops into 120KM, 160KM even 200KM.Integrated module of optical transceiver speed has also developed into 1.25G, 2.5G, 10G by originally 155M.

The most conventional at present is not as shown in Figure 1 with the 1.25G integrated module of optical transceiver circuit board of booster circuit and digital diagnostic monitoring function (DDM).Comprise a laser driving chip, a detector chip for driving, other supporting capacitance resistances such as EEPROM storage chip; Comprising LD negative electrode of laser transmitting terminal, LD anode/PD negative electrode pin-sharing, PD anode, GND ground connection; Receiving terminal comprises a power Vcc, output signal cathode, output signal anode, GND ground connection; This place, circuit pad pin position all is connected photoelectric diode by direction with requirement, carries out the opto-electronic conversion transmission.And this circuit can only satisfy the transmission of not being with digital diagnostic monitoring function 80KM at most.If improve the sensitivity that detector receives, boost to the circuit of 48V from 3.3V from newly opening system, thereby reach the transmission range of 120KM, 160KM.If this transceiver module of customer requirement uses in remote districts, band digital diagnostic monitoring function is provided, this circuit board also need be opened MCU monitoring of making belt current or voltage monitoring or the circuit board that the numerical diagnostic chip is provided again so.Though this product can backward compatible 622M, 155M has satisfied not the demand of client 2.5G, has further limited customer selecting, thereby increases client's cost.

Summary of the invention

The purpose of the utility model is in order to satisfy the various demand of client practicing thrift under the prerequisite of cost, provides the two fiber modules of a kind of SFP the optional circuit that boosts with the numerical diagnostic function, and meets international SFF-8472 protocol requirement.

The purpose of the utility model is following the realization:

The two fiber modules of a kind of SFP are optional boost circuit with the numerical diagnostic function; Comprise that chip of laser, detector limit puts chip, the required 3.3V of avalanche photodide APD operating voltage boost 48V chip, numerical diagnostic functional chip, erasable programmable storage chip EEPROM, SFP connector, laser, APD detector; Described laser has four pin positions; Described APD detector is provided with five pin positions; Chip of laser connects into the loop with two pin positions of SFP connector, laser respectively, and a pin position of laser connects power supply, another pin position ground connection or do not connect; APD detector one pin position connects power supply; One pin position ground connection; Detector limit is put chip and is connected into the loop with two pin positions of SFP connector and APD detector respectively; Erasable programmable storage chip EEPROM and SFP connector connect into the loop, it is characterized in that: the required 3.3V of the avalanche photodide APD operating voltage 48V chip that boosts connects into the loop through numerical diagnostic functional chip and SFP connector, on the APD detector, increases a voltage monitoring pin position; And this pin position and the required 3.3V of the avalanche photodide APD operating voltage 48V chip output that boosts links to each other, and the pin position of numerical diagnostic functional chip is connected with the pin position of EEPROM and compatible.

Described chip of laser is 2.5G and backward compatible 1.25G, 622M or 155M, and it is 2.5G and backward compatible 1.25G, 622M or 155M that the detector limit is put chip.

The utility model is at first considered the transmission and the digital diagnostic monitoring function of long distance.Preferentially design the circuit board of the integrated module of optical transceiver that 3.3V rises booster circuit and the integrated digital diagnosing chip scheme of 48V; Then at numerical diagnostic functional chip reserved place, designing not need be with the pin position of the EEPROM storage chip of numerical diagnostic function and compatible with the numerical diagnostic chip pin position; If the client need grow Distance Transmission and digital diagnostic monitoring function; Then detector avalanche diode place is increased a voltage monitoring pin position and the required 3.3V of the APD operating voltage 48V chip output that boosts and link to each other, avalanche diode boosts and the function of digital diagnostic monitoring thereby satisfy; If do not need these two functions only to need to stay booster circuit and numerical diagnostic chip circuit, and stick EEPROM A0h address storage chip at numerical diagnostic chip place and get final product at SMT paster space-time; Should be connected the voltage monitoring pin this moment with the detector supply pin, thereby can satisfy the most conventional above-mentioned receiver-transmitter integrated module circuit board function.

Description of drawings

Fig. 1 is conventional receiver-transmitter integrated module function diagram.

Fig. 2 is the circuit diagram of the utility model.

Embodiment

In conjunction with accompanying drawing the utility model is done further to describe.

The utility model is as shown in Figure 2; Comprise that 2.5G and following chip of laser U1,2.5G and following detector limit puts chip U2, the required 3.3V of avalanche photodide APD operating voltage boost 48V chip U4, numerical diagnostic functional chip U5, erasable programmable storage chip EEPROM U3, SFP connector, laser D1, APD detector D2; Described laser D1 has four pin positions, and (wherein the GND grounding leg does not indicate in the figure; Because this pin position; It is fixed to come according to antinoise coefficient in the practical application, and it is good that the laser that has connects this lower margin, and noise factor is little; Have then not connect this lower margin noise factor little), described APD detector D2 is provided with five pin positions; Two pin positions of laser D1 (PD anode, LD negative electrode) connect into the loop, and the pin position of laser D1 connects power supply, another pin position ground connection or do not connect; 2.5G backward compatible detector limit is put chip U2 and is connected into the loop with two pin positions (DOUT-, DOUT+) of SFP connector and APD detector D2 respectively; APD detector D2 one pin position connects power supply; One pin position ground connection; Erasable programmable storage chip U3 and SFP connector connect into the loop; The voltage monitoring pin position of APD detector D2 and the required 3.3V of the avalanche photodide APD operating voltage 48V chip U4 output that boosts links to each other, and the pin position of numerical diagnostic functional chip is connected with the pin position of EEPROM and compatible.4 pin positions of laser (D1), PD anode, LD negative electrode, the LD anode/public pin of PD negative electrode/power supply position, the signal of telecommunication is come from the input of SFP connector end, through behind U1 and the D1, connects D1 and APD detector D2 with the optical fiber connector then; 5 pin positions of APD detector D2 are GND lower margin, Vcc supply pin, output signal negative electrode pin, output signal anode pin, voltage VPD monitoring pin position; Data output anode pin is connected the detector limit and puts chip U2 with data output cathode pin, and finally is connected to the SFP connector that is connected with the signal of telecommunication; The Vcc supply pin then directly links to each other with the ground of circuit board with the GND lower margin; Wherein VPD pin position is connected with U4; And U4 can connect U5 and be connected to the SFP connector part through U5 and the shared department's circuit trend of eeprom chip U3 then; Thereby satisfy the client not only with booster circuit but also with the requirement of numerical diagnostic function, reach the transmission of long distance.If the client only needs booster circuit, do not need the numerical diagnostic function, have mercy on and drive the SFP connector that U5 is directly connected to signal of telecommunication end in the joint place that only directly link 2 circuit on the U4 left side U3 and U5 this moment.Thereby reach and boost and be not with numerical diagnostic function.If not needing booster circuit, the client must not be with the numerical diagnostic function; Just should change the APD detector into conventional PIN-TIA photodiode detector this moment so; And this moment, VPD pin position should be connected with the VCC power supply pin, and VPD pin position should directly not connect U5 and links to each other with the SFP connector connecting U4.Thereby this detector has been realized band numerical diagnostic function to the greatest extent, and the stored information of EEPROM deposits in the A0h and A2h address of U5 in the lump.If the client do not need booster circuit not need numerical diagnostic yet, then only need be welded together this VPD pin position and VCC pin, and the VPD pin need not connect U5 and U3, and independent linking to each other with the SFP connector of U3 gets final product, thereby can substitute Fig. 1 scheme.

Comparative example:

As shown in Figure 1, this Laser Drive U1 and detector drive laser D1, the detector D2 that U2 only can the following speed of compatible 1.25G, and this D2 has 4 pin positions for the 4PIN detector.The Vcc supply pin, GND grounding leg, output signal anode and output signal negative electrode pin.Compare with Fig. 2 and to have lacked a VPD pin position; The existence of this pin position is also shown the decision integrated module of optical transceiver whether with the important parameter of diagnostic function, thereby some conventional stored informations of optical transceiver module also can only leave in the EEPROM U3 chip that is connected with the SFP connector separately.If the auspicious optical device that on this circuit board, lets of client reaches extra long distance 120KM, the transmission of 160KM must design the circuit board of another set of band APD booster circuit again, and detector should be APD avalanche diode detector at this moment.Regular situation, the optical transceiver module quantity required of over distance transmission does not have short distance and long distance requirement amount big certainly, thereby the cost of driving an APD booster circuit of system separately is too high with regard to what show this moment, is unfavorable for the final sales of this series products on market.

U1 that adopts in the utility model and U2 satisfy the backward compatible IC of 2.5G; Do not have too big advantage though compare this scheme, combine the compatibility function of its comprehensive aspect, not only can in PCB plate-making, practice thrift the expense of opening making sheet with single low side price; Also can improve simultaneously the familiarity of producers to this plank; Thereby can enhance productivity, reduce administrative expenses, and then embody the advantage of product.

To sum up tell, the utility model has designed a kind of two fine SFP modular circuit that can backward compatible 2.5G speed, and optional booster circuit of this circuit and numerical diagnostic function.Circuit one end connects optical device, and the other end then connects the signal of telecommunication equipment of switch or other band SFP connector.Be connected with optical patchcord between laser and detector, thus can the expensive coaxial cable of alternative cost, reach long distance even the transmission of over distance signal.

Above utility model scheme is made some modifications for the those of ordinary skill in the industry under the situation that does not break away from the utility model principle, these revise the protection range that also should be regarded as the utility model.

Claims

1. the optional circuit that boosts with the numerical diagnostic function of the two fiber modules of a SFP; Comprise that chip of laser, detector limit puts chip, the required 3.3V of avalanche photodide APD operating voltage boost 48V chip, numerical diagnostic functional chip, erasable programmable storage chip EEPROM, SFP connector, laser, APD detector; Described laser has four pin positions, and described APD detector is provided with five pin positions; Chip of laser connects into the loop with two pin positions of SFP connector, laser respectively, and a pin position of laser connects power supply, another pin position ground connection or do not connect; APD detector one pin position connects power supply; One pin position ground connection; Detector limit is put chip and is connected into the loop with two pin positions of SFP connector and APD detector respectively; Erasable programmable storage chip EEPROM and SFP connector connect into the loop, it is characterized in that: the required 3.3V of the avalanche photodide APD operating voltage 48V chip that boosts connects into the loop through numerical diagnostic functional chip and SFP connector, on the APD detector, increases a voltage monitoring pin position; And this pin position and the required 3.3V of the avalanche photodide APD operating voltage 48V chip output that boosts links to each other, and the pin position of numerical diagnostic functional chip is connected with the pin position of EEPROM and compatible.