CN211293390U

CN211293390U - Active optical cable of pure light

Info

Publication number: CN211293390U
Application number: CN201922145728.4U
Authority: CN
Inventors: 陈绍璿
Original assignee: Optiworks Kunshan Co Ltd
Current assignee: Optiworks Kunshan Co Ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-08-18
Anticipated expiration: 2029-12-04

Abstract

The utility model discloses an active optical cable of pure light ization, including two photovoltaic module and optic fibre, optical fiber connection is two the photovoltaic module, one of them the photovoltaic module is the transmitting terminal, and wherein another is the receiving terminal, each the photovoltaic module includes printed circuit board, install in photoelectric conversion chip and FPGA programmable logic chip on the printed circuit board, each the low-speed of photovoltaic module is handed over and is held the signal and insert to this photovoltaic module in FPGA programmable logic chip, for the transmitting terminal the photovoltaic module FPGA programmable logic chip with do the receiving terminal the photovoltaic module FPGA programmable logic chip passes through optical fiber connection. The low-speed handshaking signal is transmitted instead of the original copper cable, the pure light of the active cable is completed, and the active cable is prevented from being interfered by electromagnetic wave crosstalk and external noise.

Description

Active optical cable of pure light

Technical Field

The utility model relates to an optical fiber communication technical field especially relates to an active optical cable of pure light ization.

Background

An Active Optical Cable (AOC) is a communication Cable that converts an electrical signal into an Optical signal or converts an Optical signal into an electrical signal by means of an external energy source during a communication process. The two ends of the traditional active optical cable are standard universal photoelectric modules, and the middle of the traditional active optical cable is a cable product connected by an optical fiber hybrid cable.

The active optical cable is the latest form of optical communication development application, and is widely applied to the fields of data storage, data exchange, multimedia high-definition display, VR application, cloud computing and big data of a data center. With the use of a large number of active optical cables in a limited space high-density wiring environment, the formed complex electromagnetic environment affects the data transmission of the active optical cables, resulting in the situation of increased data transmission error codes or data link flash. There are many manufacturers who have introduced solutions to the filter for this situation, but the filter is expensive and heavy to combine with the optical-electrical hybrid cable, and cannot compete with the pure optical solution in the future application market.

In addition, with the explosion of big data in recent years, the active optical cable has received great attention from the market, and has gradually become a core device for data transmission, switching and storage. However, in some specific application scenarios, it is necessary to suppress crosstalk of specific electromagnetic waves and avoid crosstalk of external environmental electromagnetic wave signals and background noise signals through a copper cable in an active optical cable in an internal environment when the system is used, for example, in an MR nuclear magnetic resonance apparatus used in medicine, in an MR scanning chamber, the external electromagnetic waves in a specific frequency band need to be isolated to avoid noise formation, so that the quality SNR of signals to be transmitted is too low, and the imaging quality of nuclear magnetic resonance medical images is affected.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the embodiments of the present invention provide a pure optical active optical cable, which can avoid the electromagnetic wave crosstalk and the external noise interference. The active optical cable comprises two photoelectric modules and an optical fiber, wherein the optical fiber is connected with the two photoelectric modules, one photoelectric module is a transmitting end, the other photoelectric module is a receiving end, each photoelectric module comprises a printed circuit board, a photoelectric conversion chip and an FPGA programmable logic chip which are installed on the printed circuit board, and a laser driver, a transimpedance amplifier, a lens array and an optical fiber array which are connected with the FPGA programmable logic chip, wherein the laser driver in each photoelectric module is connected with a VCSEL laser array in the photoelectric module, the transimpedance amplifier in each photoelectric module is connected with a PD detection optical secondary body array in the photoelectric module, a low-speed handshake signal of each photoelectric module is accessed to the FPGA programmable logic chip in the photoelectric module through a pin, the FPGA programmable logic chip of the photoelectric module at the transmitting end and the FPGA programmable logic chip of the receiving end are connected with each other through pins The FPGA programmable logic chip of the photoelectric module is connected through the optical fiber.

Further, the low-speed handshake signals include AUX +, AUX-, HPD, CONFG1, and CONFG 2.

Furthermore, the photoelectric conversion chips of the transmitting end and the receiving end are communicated through four optical fibers.

Furthermore, the FPGA programmable logic chip is communicated through two optical fibers.

Furthermore, the packed LVDS signals when the FPGA programmable logic chip is transmitted with the laser driver and the transimpedance amplifier are above 20 Mbps.

Furthermore, the photoelectric conversion chip, the FPGA programmable logic chip, the laser driver, the VCSEL laser array, the transimpedance amplifier, the PD light detection secondary body array, the lens array and the optical fiber array are directly pasted on the electrode of the printed circuit board through conductive adhesive.

Furthermore, a plurality of optical fiber bundles composed of the optical fibers are arranged in the photoelectric module, and the optical fiber bundles are fixedly adhered to the front surface of the printed circuit board.

The utility model has the advantages as follows:

the active optical cable enables low-speed handshake signals to be serially and parallelly arranged on an optical channel through FPGA programmable logic chip embedded programming, and is connected to a receiving end through optical fibers to finish the purpose of pure light, so that the active optical cable is prevented from being interfered by electromagnetic wave crosstalk and external noise.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic circuit diagram of an active cable according to an embodiment of the present invention;

fig. 2 is a diagram of a printed circuit board of an active cable according to an embodiment of the present invention.

Reference numerals of the above figures: a transmitting terminal-1; a printed circuit board-11; a photoelectric conversion chip-12; FPGA programmable logic chip-13; a laser driver-14; VCSEL laser array-141; a transimpedance amplifier-15; PD light detection secondary array-151; a lens array-16; an optical fiber array-17; a receiving end-2; an optical fiber-3.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.

In order to achieve the above object, the present invention provides a pure actinic active optical cable, which includes two optoelectronic modules and an optical fiber 3, the optical fiber 3 connects two optoelectronic modules, one of them the optoelectronic module is a transmitting end 1, and the other is a receiving end 2. Each photoelectric module comprises a printed circuit board 11, a photoelectric conversion chip 12 and an FPGA programmable logic chip 13 which are installed on the printed circuit board 11, and a laser driver 14, a transimpedance amplifier 15, a lens array 16 and an optical fiber array 17 which are connected with the FPGA programmable logic chip 13. The laser driver 14 in each of the optoelectronic modules is connected to the VCSEL laser array 141 in the optoelectronic module, the transimpedance amplifier 15 in each of the optoelectronic modules is connected to the PD detection secondary array 151 in the optoelectronic module, and the low-speed handshake signal of each of the optoelectronic modules is connected to the FPGA programmable logic chip 13 in the optoelectronic module through a pin, where in this embodiment, the low-speed handshake signal includes AUX +, AUX-, HPD, CONFG1, and CONFG 2. The FPGA programmable logic chip 13 of the optoelectronic module of the transmitting end 1 and the FPGA programmable logic chip 13 of the optoelectronic module of the receiving end 2 are connected through the optical fiber 3.

In this embodiment, the low-speed handshake signal is embedded into the FPGA programmable logic chip 13, and then is connected to the FPGA programmable logic chip 13 of the transmitting terminal 1 and the FPGA programmable logic chip 13 of the receiving terminal 2 through the optical fiber 3, so that compared with a conventional active optical cable, the low-speed handshake signal is directly transmitted from the transmitting terminal 1 to the receiving terminal 2 through a copper cable, which can avoid electromagnetic wave crosstalk and external noise interference, and form a purely optical active optical cable.

In this embodiment, the low-speed handshake signal of the optoelectronic module of the transmitting terminal 1 is sent to the FPGA programmable logic chip 13 of the transmitting terminal 1 through the printed circuit board 11, and the low-speed handshake signal is packaged to become an LVDS serial electrical signal, and then is fed to the laser driver 14, and the laser driver 14 drives the VCSEL laser array 141 to emit light with a strong or weak intensity through modulating current, and then is coupled to the optical fiber array 17 through the lens array 16. The LVDS serial signal is modulated into an optical signal, the optical fiber 3 transmits the optical signal to the PD photodiode array 151 of the receiving end 2, the PD photodiode array 151 generates a corresponding photocurrent and transmits the photocurrent to the transimpedance amplifier 15, and the transimpedance amplifier 15 converts the photocurrent back into the LVDS serial electrical signal. At this moment, the original LVDS serial electrical signal at the transmitting end is already transmitted to the receiving end 2 through the optical fiber 3, and is successfully decoded back to the original LVDS serial electrical signal. However, the LVDS string sequence signals at this time are formed by mixing various handshake signals (AUX +, AUX-, HPD, CONFG1, and CONFG2) of the original transmitting terminal 1, and the LVDS string sequence signals need to be respectively decomposed into original low-speed handshake signals. Therefore, the FPGA programmable logic chip 13 of the receiving end 2 unpacks the LVDS string sequence electrical signal back to the original low-speed handshake signal. Meanwhile, the receiving end 2 also needs to pack the local low-speed handshake signals of the receiving end 2 to the transmitting end 1 through the optical fiber 3 in the same way, so that the transmitting end 1 synchronously responds to the response of the receiving end 2, a complete two-party communication mechanism is formed once, the original way of only using a copper cable for electrical communication is replaced, and the active optical cable achieves a completely photochemical application scene.

Since the optical fiber and the optical signal are not interfered by the external electromagnetic signal originally, the signal crosstalk can be greatly reduced. In this embodiment, four optical fibers are required for transmitting the Main Link high-speed optical signal, two optical fibers are required for the low-speed handshake signal to go back and forth between the transmitting end 1 and the receiving end 2, and a pure optical active optical cable with six optical fibers is formed in this embodiment. When transmitting the low-speed handshaking signals, the low-speed handshaking signals in the conventional hybrid cable have a plurality of copper cables in one-to-one correspondence, and the two optical fibers are adopted in the embodiment to replace the original plurality of copper cables. Therefore, the total active optical cable of the present embodiment is much lighter in weight than the conventional hybrid cable, which can greatly reduce the weight and cost.

Further, the packed LVDS string sequence electrical signal when the FPGA programmable logic chip 13, the laser driver 14 and the transimpedance amplifier 15 transmit is above 20 Mbps.

Further, the photoelectric conversion chip 12, the FPGA programmable logic chip 13, the laser driver 14, the VCSEL laser array 141, the transimpedance amplifier 15, the PD detection secondary body array 151, the lens array 16, and the optical fiber array 17 are directly attached to the electrodes of the printed circuit board 11 through conductive adhesives.

Furthermore, a plurality of optical fiber bundles composed of the optical fibers are arranged in the photoelectric module, and the optical fiber bundles are fixedly adhered to the front surface of the printed circuit board 11.

The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A pure-optical active optical cable is characterized by comprising two photoelectric modules and optical fibers, wherein the optical fibers are connected with the two photoelectric modules, one photoelectric module is a transmitting end, the other photoelectric module is a receiving end, each photoelectric module comprises a printed circuit board, a photoelectric conversion chip and an FPGA programmable logic chip which are installed on the printed circuit board, and a laser driver, a transimpedance amplifier, a lens array and an optical fiber array which are connected with the FPGA programmable logic chip, wherein the laser driver in each photoelectric module is connected with the VCSEL laser array in the photoelectric module, the transimpedance amplifier in each photoelectric module is connected with the PD detection optical secondary array in the photoelectric module, and a low-speed handshake signal of each photoelectric module is connected to the FPGA programmable logic chip in the photoelectric module through a pin, the FPGA programmable logic chip of the photoelectric module at the transmitting end and the FPGA programmable logic chip of the photoelectric module at the receiving end are connected through the optical fiber.

2. The active optical cable of claim 1, wherein the low-speed handshaking signals comprise AUX +, AUX-, HPD, CONFG1, CONFG 2.

3. The active optical cable of claim 2, wherein the photoelectric conversion chips of the transmitting end and the receiving end are connected by four optical fibers.

4. The actinically purified active optical cable of claim 3 wherein the FPGA programmable logic chip communicates through two optical fibers.

5. The actinically purified active optical cable of claim 4 wherein the packetized LVDS signal when the FPGA programmable logic chip is transmitted with the laser driver and the transimpedance amplifier is above 20 Mbps.

6. The active optical cable of claim 5, wherein the photoelectric conversion chip, the FPGA programmable logic chip, the laser driver, the VCSEL laser array, the transimpedance amplifier, the PD photodetector secondary array, the lens array, and the fiber array are directly attached to the electrodes of the printed circuit board by conductive adhesive.

7. The active optical cable of claim 6, wherein the optoelectronic module comprises a plurality of optical fiber bundles formed by the optical fibers, and the optical fiber bundles are adhered and fixed on the front surface of the printed circuit board.