Optical fiber network system and method thereby for modulating and demodulating asynchronous communication data on optical fiber transmission

Abstract

The invention discloses an optical fiber network system and a method thereby for modulating and demodulating asynchronous communication data on optical fiber transmission. The system comprises a collector and more than one carrier wave ammeter, wherein the collector and each ammeter are connected into a single-ring or double-ring optical fiber network by an optical fiber; the collector and the ammeter are respectively connected with an optical communication module; each optical communication module is provided with one or two optical receiving modules (FR) and one or two optical transmitting modules (FT); and the optical fiber is connected to FR and FT. According to the situation, the optical communication module forwards received data to other ammeters or collectors in a mode of directly forwarding or indirectly forwarding . The ammeter can be replaced by a water meter, a gas meter or a fuel gas meter.

Description

technical field [0001] The invention discloses an optical fiber network system and a data transmission method, in particular to an optical fiber network system and a method for modulating and demodulating asynchronous communication data of the system on optical fiber transmission. Background technique [0002] With the development of optical fiber technology, optical fiber transmission is more and more widely used in people's daily life. At present, in the power optical fiber communication system, an optical fiber communication scheme adopted is to connect the collector and multiple electric meters through optical modules and optical fiber strings. Line connections form a loop to form a fiber optic network system. The collector and each meter are equipped with an optical sending module and an optical receiving module. When reading the meter, the meter reading command data of the asynchronous communication is sent from the optical sending module of the collector through e...

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Problems solved by technology

Due to the smearing phenomenon of the optical transmitting unit of the optical transmitting module, the binary logic high level signal in the transmitted data will inevitably have a pulse width change after being transmitted by the optical transceiver module. If the above-mentioned asynchronous communication data is used directly In the way of transmission on the optical fiber node ring, the pulse width of the data logic level signal will change once every time it is transmitted through a group of optical transceiver modules. After a certain number of optical transceiver module groups, the pulse width of the data logic level signal will change. There is a large deviation exception, which will cause a bit error

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