What is an Optical Receiver?
In the optical fiber communication system, the task of the optical receiver is to recover the information carried by the optical carrier after the optical fiber transmission with minimal additional noise and distortion. Therefore, the output characteristics of the optical receiver comprehensively reflect the entire optical fiber communication. System performance.
- Chinese name
- Optical receiver
- Foreign name
- Optical receiver
- Task
- Recovery of information carried by optical carriers
- component
- Photodetectors, optical receiving systems, etc.
- Features
- High sensitivity, fast response, low noise, etc.
- In the optical fiber communication system, the task of the optical receiver is to recover the information carried by the optical carrier after the optical fiber transmission with minimal additional noise and distortion. Therefore, the output characteristics of the optical receiver comprehensively reflect the entire optical fiber communication. System performance.
- After transmission of the optical signal transmitted by the optical transmitter, not only the amplitude is attenuated, but also the pulse waveform is widened. The role of the optical receiver is to detect the weak optical signal after transmission, and amplify, shape, and regenerate the original transmission signal.
Optical receiver components
- 1. Photoelectric detector: Its main function is to use the photoelectric effect to convert light signals into electrical signals. In optical communication systems, the requirements for photodetectors are high sensitivity, fast response, low noise, low cost, and high reliability. The basic principle of the photodetection process is light absorption. Photodetectors commonly used in optical communication systems are PIN photodiodes and avalanche diodes (APD). Comparison of the performance of the two detectors: Because the PIN with the same performance is compared with the APD, the price of the PIN is lower, and the noise of the PIN is lower.
- 2. Optical receiving system: At the receiving end, the function of the receiving antenna is to collect and focus the light field propagating in space onto the surface of the detector.
- Signal processing
- In a space optical communication system, the signal received by the optical receiver is very weak, and in the case of interference with a high background noise field, the signal-to-noise ratio S / N <1 at the receiving end will be caused. So it is necessary to process the signal. The commonly adopted measures are: First, on the optical channel, an optical narrowband filter is used to process the received optical signal to suppress the interference of background stray light. The basic types of optical filters are absorption filters, interference filters, birefringent filters, and new types of atomic resonance filters. Second, on the electrical channel, a preamplifier is used to convert the weak photogenerated current signal generated by the photodetector into a voltage signal, and the signal is further amplified by the main amplifier. Then, the signals are shaped and processed by methods such as equalization and filtering. Finally, the information at the transmitting end is recovered through the clock extraction, decision circuit and decoding circuit.
Optical receiver picture
- Optical receiver
Optical receiver technical characteristics
- 1. [Aerospace and First] HY-7330A series outdoor optical receiver is a new generation of HFC network optical node equipment developed and produced by our factory.
- 2. This series of products fully meet the design requirements of "GY / T185-2002 Radio, Film and Television Industry Standard", computer-aided design, microwave simulation software simulation, each part of the function is combined in a modular manner, two-way design, 1GMHz working platform, excellent in-band Flatness, bandwidth can be smoothly upgraded from 750MHz-862MHz;
- 3. The working wavelength is compatible with 1310nm and 1550nm. The high-quality and high-sensitivity PIN photodetector and die-optical integrated module are selected to make the photoelectric conversion match better and ensure the heat dissipation of the driving circuit;
- 4. The radio frequency circuit adopts PHILIPS original imported amplifier module (optional gallium arsenide module) to ensure the performance indicators and reliability of the product;
- Eight levels of optical power level indicator are displayed step by step.
- 5. The combined lightning protection measures of the signal channel and the power supply can minimize the damage to the equipment caused by lightning;
- Complete functions, components are plug-in structure, pins and sockets are copper-plated copper, to ensure performance and good contact;
- 6. The output form can be branched or distributed, which is convenient for technicians to design, install and debug;
- 7. The high-reliability switching power supply produced by professional power supply manufacturers is used. The wide working voltage of 150-280V (optional 35-95V) minimizes the impact of the power supply on the whole machine.
- 8. The functional panel is made of high-quality aluminum, drawing processing, double-layer shielding, which effectively prevents electromagnetic radiation; and the components are silk-screened so that installation technicians can clearly understand the product signal flow and facilitate engineering commissioning;
- 9. The shell adopts a new cast aluminum alloy shell and a special waterproof seal ring. The surface is sprayed with imported hammer paint, which has excellent heat dissipation, shielding and waterproof performance, which is convenient for outdoor installation and is especially suitable for large and medium-sized networks.
Optical receiver technical parameters
|
|
|
| ||
| ||
|
|
|
|
|
|
|
|
|
|
| |
|
| |
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
|
|
|
|
|
|
|
| ||
|
|
|
|
|
|
|
| |
|
|
|
| ||