Optical eye image debugging Target:
Extinction ratio
Research and development stage: between 10-15 (large is better than small), according to the actual situation can be appropriate to improve the extinction ratio, but not too low. It’s related to sensitivity.
Quiver
Research and development stage: controlled within 20PS. The less the better, the better the error performance.
Crossing point
Research and development stage: 48%-55%. It is a measure of the reading time of 0 and 1 levels. Linking with the extraction frequency is the embodiment of the performance of synchronization loss.
Optical power
Research and development stage: Control between -3dbm~-9dbm. Take the middle value as far as possible, and you need to measure the extinction ratio against this value to make the best choice. It’s a measure of signal strength.
Optical eye image debugging – Method:
1. Overshoot
The eye image shows a middle top protrusion; The solution is to improve the rising edge
2. Undershoot
The eye chart shows the bottom bottoming delay; Solution to improve the falling edge
3. Cross points
This value can be read directly from the eye map information. It can be matched by adjusting the voltage of LD+, the voltage of LD-, the Imod current, and the differential line impedance
4. Irritability
This value can be read directly from the eye map information. It can be matched by adjusting the voltage of LD+, the voltage of LD-, the Imod current, and the differential line impedance
The above is Shenzhen HDV Phoelectron Technology Ltd. to bring customers about the “optical eye map debugging” introduction article, and our company is a specialized production of optical network manufacturers, the products involved are ONU series (OLT ONU/AC ONU/CATV ONU/GPON ONU/XPON ONU), Optical module series (optical fiber module/Ethernet optical fiber module /SFP optical module), OLT series (OLT equipment /OLT switch/optical cat OLT), etc., there are various specifications of communication products for the needs of different scenarios for network support, welcome to consult.