CN104469331A - Single-fiber serial-connection many-to-one optical transmitter and receiver - Google Patents

Abstract

The invention discloses a single-fiber serial-connection many-to-one optical transmitter and receiver. The single-fiber serial-connection many-to-one optical transmitter and receiver is applied to fiber signal conversion and transmission in the fields of security, industrial control and monitoring. The technical features, the differences with an existing optical transmitter and receiver, the technical advantages and the application fields of the single-fiber serial-connection many-to-one optical transmitter and receiver are described in an instruction book. Through the instruction book, people can basically know the structure and networking of the optical transmitter and receiver.

Description

Single fiber series winding many-one optical transmitter and receiver

At industry control and monitoring, safety-security area, RS485 or similar bus are widely used, but it is limited to there is transmission range in this type of bus, transmission rate is lower, anti-interference poor with thunderbolt ability, also there is potential safety hazard under installation scenarios together with forceful electric power, being connected up by optical fiber at present progressively replaces, and light entering and copper back has become irreversible trend.Optical Fiber Transmission has low-carbon green, and transmission rate is high, distance, and the features such as antijamming capability is strong, at present in the field such as industry control, security protection, the optical transmitter and receiver of RS485/RS422/RS232 bus interface is widely used.

One. current existing RS485 bus optical transmitter and receiver characteristic sum present situation:

All RS485 on the market or similar bus optical transmitter and receiver structure are now: optical transmitter and receiver adds power source by an optical module and signal is changed and a fast bridge of biography and an optical modulating circuit form, this optical transmitter and receiver can convert RS485/RS422/RS232 signal to modulated light signal, by Optical Fiber Transmission to other nodes or central host, optical fiber can be dual wavelength twin-core fiber structure, also can be dual wavelength single-core fiber structure.

This optical transmitter and receiver structures shape current industry control and security protection fiber optic network structural wiring form.This fiber routing structures, for the not oversize occasion of building inner distance or proper, for each node directly access control machine room or central control host, once break down, is convenient to check and get rid of.But for outdoor long-distance transmissions, but there is great drawback:

1. each optical transmitter and receiver needs the optical splitter near independent intelligent acess central control unit, like this to outdoor ultra-long span transmission, such as large-scale petrochemical safety monitoring, may to there be a few km or tens kms by the longest optical fiber, other also may have a few km or tens kms, such civil engineering workload is huge, and need to dig trench and bury cable of giving out light, such construction cost likely offsets the advantage of optical cable green low-carbon.

2. at outdoor or remote locations often due to cruelty construction, animal damage, artificial destruction causes interruption of optical cables, due to optical cable distance, and be embedded in underground, and check that fault point becomes a very difficult job like this, not difficult to find, to workload be changed after finding larger, change this optical cable expense also higher.

3., owing to adopting optical splitter to cause optical attenuation, the maximum light splitting number of current optical splitter is 1:64, which limit the number of nodes of every primary Ioops, and the general maximum node number of every primary Ioops is 64 tunnels.

4., due to above feature, lose the simple and practical advantage that general bus only has two lines like this.

Two. the single fiber series winding many-one optical transmitter and receiver feature of our design:

Single fiber series winding many-one optical transmitter and receiver and in the past different this optical transmitter and receiver i.e. of industry control optical transmitter and receiver comprise 2 optical modules, a RS485/RS422/RS232 signaling conversion circuit, an optical signal modulation circuit, and multiple signals differentiate and routing gateway forms.This optical transmitter and receiver differentiates the light signal from higher level and subordinate, and the light signal from main control system is converted to RS485/RS422/RS232 signal is sent to Controlling vertex, after Controlling vertex parts are corresponding, close the light signal of subordinate at once, avoid signal competition in bus, at this moment play routing gateway effect.When optical transmitter and receiver at the corresponding levels does not respond, the optical signal transmission of open subordinate, plays relaying and signal amplification, as long as transmission delay is within a baud rate in theory, can transmit enough far away.

Brand-new fiber optic network transmission structure can be formed: central control host or gateway are to each optical transmitter and receiver node by this optical transmitter and receiver, pass through link mode, i.e. hand in hand mode signal transmission, each optical transmitter and receiver is a node connection control equipment, also be an optical repeater and gateway, the length sum of all optical fiber is exactly the length adding every platform optical transmitter and receiver tail optical fiber to the fiber lengths of farthest.Also a twin-core fiber or a single-core fiber is only had.Use in this security protection or monitoring or industrial control field like this, tool has the following advantages:

1. optical fiber only has one, can connect up with power supply, does not need to arrange special fiber optic cables ditch or sleeve pipe, saves a large amount of civil engineering cost, also saves a large amount of optical fiber.

2. maintaining is easy, and when there is communication failure, readily appreciate that it is that to be positioned at the optical fiber in which section optical transmitter and receiver interval out of joint, need the optical fiber of optical fiber also just between certain two optical transmitter and receiver changed, distance is very short.

3., because every platform optical transmitter and receiver is all an optical repeater and amplifier, transmission range total like this can be far, do not worry the attenuation problem of light long range propagation.

4. this is this structure, inherits the advantage of the universal serial bus such as RS485/RS422, CAN in the past.

Three. practical application effect analysis

Above optical transmitter and receiver is applied in Shanghai petrochemical industry security protection project and Xi'an security protection project.Shanghai petrochemical industry security protection project, plant area's area is large, part plant area belongs to reserved plot, weeds is overgrown with bushes, poisonous snake haunts, construction is inconvenience extremely, if do Signal transmissions with the optical transmitter and receiver of traditional approach, need large-area site clearing, ditching, preheating embedding line etc., civil engineering costs and construction volume huge, maintaining is from now on extremely inconvenience also, after using the Optical Fiber Transmission of novel optical transmitter and receiver and new paragon instead, optical fiber connects up along enclosure wall with power line, save a large amount of civil engineering cost, achieve good economic benefit and social benefit, accomplish to set an example by personally taking part in low-carbon environment-friendly.

Four. application is expanded:

[0019] as long as this structure is suitably improved, adopt the high-speed chips such as FPGA as master control router chip, the occasions such as highway photographic technique can be applied to equally.

Fig. 1: conventional art RS485 or similar bus optical transmitter and receiver structure chart

Fig. 2: novel single fiber series winding many-one optical transmitter and receiver fiber optic network structural wiring schematic diagram

Fig. 3: single fiber series winding many-one optical transmitter and receiver structure chart

Fig. 4: single fiber series winding many-one optical transmitter and receiver industry control and security protection fiber optic network structural wiring form figure.

Claims (1)

1. The type of skill: the loop network link formula signal transmission through fiber optical transmitter and receiver of two optical module

   Application: security protection, industry control, the conversion of monitoring field fiber-optic signal and transmission

   Protection requires:

   1. the optical transmitter and receiver of the loop network link technical characteristic of the two optical module of pair employing carries out patent protection; comprise the software control code that wherein microcontroller is embedded in, method copies, manufactures the similar products with this technical characteristic must not to adopt clone, chip software cracks etc.