What is the optical power and sensitivity of the optical module?

Which characteristics of the optical module are they determined? In order to ensure the quality of the product, the optical module must be tested in multiple steps before it can be shipped. In the test, there are several parameters that are very important. Only when these parameters meet the relevant standards can the optical module perform best.These parameters include: transmitted optical power, receiving sensitivity, bias current, saturated optical power, extinction ratio, and operating temperature. The transmitted optical power refers to the output optical power of the light source at the transmitting end of the optical module. It is an important parameter in dBm, which directly affects the quality of network communication. The transmitted light power refers to the light intensity at the transmitting end, and the receiving sensitivity refers to the light intensity that can be detected. Both are in dBm and are important parameters that affect the transmission distance. The distance that an optical module can transmit is mainly limited by both loss and dispersion. The sensitivity of the optical module refers to the lowest received optical power that can receive signals without error. The receiving sensitivity is the range in which the optical module receives the optical signal. The optical module within the sensitivity range can normally receive the transmitted optical signal, and the optical module may not work normally without receiving the sensitivity range. Receive sensitivity refers to the minimum received optical power of the optical module at a certain rate and bit error rate, in dBm. In general, the higher the rate, the worse receiver sensitivity, i.e., the larger the minimum received optical power, the receiving end device requirements are higher for the optical module. The transmission distance of the module is subject to a certain loss and dispersion when the optical signal is transmitted in the optical fiber. This part of the energy is dissipated with a certain ratio as the transmission distance increases due to the absorption and scattering of the medium and the loss of optical energy caused by the leakage. The dispersion is mainly caused by the unequal speed of electromagnetic waves of different wavelengths propagating in the same medium, which causes different wavelength components of the optical signal to reach the receiving end at different times due to the accumulation of the transmission distance, resulting in pulse broadening and thus inability to distinguish signals. value. Therefore, the user can select an optical module according to actual conditions to meet different transmission distance requirements. The maximum input optical power at a certain bit rate while maintaining a certain bit error rate.When the received optical power is greater than the saturated optical power, the error will also occur. So for large light emitted optical power attenuation module without loopback test error occurs phenomenon.