What is the basic knowledge of optical transceiver

In addition to the above three main technical parameters, the Juniper EX-SFP-10GE-LR has the following basic concepts, which only need to be understood briefly:

1) Laser category: The laser may be the core device in the optical transceiver. It injects current into the semiconductor material and emits laser light through the photon oscillation and gain of the resonant cavity. At present, the most commonly used lasers are FP and DFB lasers. The difference between them is that the semiconductor materials and resonant cavity structure are different. The price of DFB lasers is much more expensive than that of FP lasers. Optical transceiver with a transmission distance of less than 40KM generally use FP lasers; The optical transceiver with a transmission distance ≥40KM generally use DFB lasers;

2) Loss and dispersion: Loss is the loss of light energy due to the absorption, scattering and leakage of the medium when light is transmitted in the optical fiber. This area of the energy is dissipated at a certain rate as the transmission distance increases. The generation of chromatic dispersion is mainly because of the unequal speed of electromagnetic waves of different wavelengths when propagating in the same medium, which causes the different wavelength components of the optical signal to arrive at the receiving end at different times due to the accumulation of transmission distance, resulting in pulse broadening and inability to distinguish the signal value. These two parameters mainly affect the transmission distance of the optical transceiver. In the actual application process, the link lack of the 1310nm optical transceiver is generally calculated at 0.35dBm/km, and the hyperlink loss of the 1550nm optical transceiver is normally calculated at 0.20dBm/km, and the calculation of the dispersion value Very complicated, generally only for reference;

3) Transmitting optical power and getting sensitivity: Transmitting optical power refers to the output optical power of the light source at the transmitting end of the optical transceiver, and receiving sensitivity identifies the minimum received optical power of the optical transceiver at a particular rate and bit error rate. The units of these two parameters are dBm (meaning decibel milliwatt, logarithmic form of power unit mw, the calculation formula is 10lg, 1mw is converted to 0dBm), which are mainly used to define the transmission distance of the product, different wavelengths, transmission rates and The optical transmitting power and getting sensitivity of the optical transceiver of the transmission distance will be different, as long as the transmission distance can be ensured;

4) The service life of the optical transceiver: the international uniform standard, 7X24 hours of uninterrupted work for 50,000 hours (equivalent to 5 years);

5) Optical fiber interface: HP J9151A Modules are all LC interfaces, GBIC optical transceiver are SC interfaces, and other interfaces include FC and ST;

6) Working temperature: 0~+70℃; storage temperature: -45~+80℃; working voltage: 3.3V; working level: TTL/PECL/CML/LVDS.Know more:www.oemfibers.com