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The Relationship Between DWDM And OSC System

Optical Monitoring Channel (OSC) for DWDM systems

In the DWDM system, an independent 1510nm wavelength (2Mb/s) is used to carry the optical monitoring channel (OSC), which transmits the network management, business and monitoring information, and the frame structure conforms to G. 704, the rate actually used for monitoring information transmission is 1920 kb/s. The OSC optical monitoring channel is an information carrier for the working state of the DWDM system. In the DWDM system, the OSC is a relatively independent subsystem that transports the maintenance and management information of the optical channel layer, the optical multiplex section layer and the optical transport section layer, provides the official communication and user access, and provides other additional functions. The main functions of the OSC include: OSC channel reception and transmission, clock recovery and regeneration, receiving external clock signals, OSC channel fault detection and processing and performance monitoring, CMI codec, OSC frame positioning and framing processing, and monitoring information processing. . Performance monitoring (B1, J0, OPM, optical emission monitoring) can be completed by the service access terminal. Analog monitoring function and B1 error monitoring function provide multi-channel optical channel performance monitoring (including channel wavelength, optical power, optical signal-to-noise ratio) without interrupting service, timely monitoring optical transmission segment and optical channel performance quality, and providing fault location Effective means. It has the functions of monitoring the input optical power of the amplifier, output optical power, PUMP drive current, PUMP cooling current, PUMP temperature and PUMP back optical power. With monitoring the multi-directional wave number, the wavelength of each channel, optical power and optical signal-to-noise ratio performance, the monitored wavelength accuracy can be greater than 0.05nm, the optical power accuracy can be greater than 0.5dBm, and the signal-to-noise ratio accuracy can be greater than 0.5dB.

optical fiber amplifier

According to the position in the transmission of the fiber amplifier, there are three types:

(1) placed behind the optical transmitter, called the power amplifier;

(2) A relay placed between optical fiber lines, called a line amplifier;

(3) placed in front of the optical receiver, called the preamplifier.

The functions implemented by optical amplification can be divided into two types:

(1) Erbium-doped fiber amplifiers: with gain flatness, gain lock, output power clamping, and amplifier transient control. In order to eliminate the "surge" phenomenon of optical amplifiers due to sudden accidents, optical amplifiers also have optical power. Automatic Shutdown (APSD) and Automatic Power Reduction (APR).

(2) RPM Raman fiber amplifier: designed for long-distance optical transmission systems, using high-performance 14XXnm pump lasers and passive components, compact structure, can directly amplify C-Band, L-Band, C+L-Band The optical signal improves the line optical signal-to-noise ratio (OSNR), which improves the transmission performance of the system and meets the requirements of the Telcordia GR-1312-CORE standard.

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