TX refers to the transmitted optical power, and RX refers to the received optical power. So what do you know about the transmitted optical power and the received optical power? What is the normal range value of the two? How to test the optical power of the optical module in the normal range?
What is the transmit/receive power? What is its normal range value?
Transmitting optical power refers to the output optical power of the light source at the transmitting end of the optical module, and receiving optical power refers to the input optical power of the light source at the receiving end of the optical module.
Both are in dBm, and both are important parameters that affect the signal transmission distance. Generally, only when the transmit optical power and the received optical power of the optical module are within the upper and lower thresholds, can it ensure good transmission performance.
However, optical modules with different wavelengths, distances, and speeds have different transmit optical power and receive optical power. For example, the transmit optical power of a 500-meter SFP1G-SX-85 optical module (with a center wavelength of 850nm) is -9.5dBm~-2.5dBm, and the received optical power is -17dBm~0dBm; a 10km SFP1G-SX-31 optical module ( The center wavelength is 1310nm) the emitted light power is -9.5dBm~-3dBm, and the received light power is -20dBm~-3.0dBm.
How to test the transmit/receive optical power? We will introduce for you in next article.
