After a finished optical module is made to ensure the quality of products, a plurality of steps to be tested before shipment. In the test, there are several parameters is very important, only those parameters comply with the relevant standards, in order to make the best performance of the optical module. These parameters include: transmit optical power, receiver sensitivity, bias current, saturation power, extinction ratio and the operating temperature .
Today we look at the focus of the emitted light power, you may probably know its definition, but you know how to test optical power module do? So, please follow the footsteps of easy-sky communications, we will answer your!
First, we need to understand what is emitted optical power .
Refers to the output optical power emitted optical power of a light source module sending end , in dBm, is an important parameter of the optical module, it will directly affect the quality of network communications.
What causes bad light module power?
power to resistor mismatch v
V driver chip failure or poor performance of the patch
v emission components or poor TOSA wherein Weld pin PD +
v LD +, LD- poor bead on the signal line, the drain or paste mislabeled
Components (capacitors, resistors, inductors or magnetic beads) v storage under adverse chip pin, or leakage paste mislabeled
How to test the emitted light power of the light module?
We generally use the tool and optical attenuator power meter, the test procedure is as follows:
v using the power measured light output power of the optical transmitter . Industry standards define a specific network standard optical input power transmitter and receiver. Using the receiver and transmitter need to match the optical output power of the transmitter to be within a predetermined range;
v emitter connected to the receiver, at the maximum optical input power transmitter available, testing whether it is working, then the receiver can receive the minimum optical input power of the test receiver, to see whether the receiver is still able to provide best performance;
v calculate the required level of attenuation test . Calculation Method: When the optical transmitter output power is -15 dBm, the minimum optical power of the receiver is -32 dBm, the difference between the two is 17 dB. Then you can use the optical attenuator 17 dB, the receiver and re-tested.
Doing business than simply selling products, but to professional services and technical expertise to show products to the customer, it is this knowledge that some clerk lack. Imagine, if you test knowledge of the product is not know, how customers can rest assured that the orders to How about you? So, in order to become the god of trade, we have to how to learn from the basic knowledge, do come in handy, all-knowing it!
Easy daylight Communications (ETU-LINK) as an optical module manufacturer, free for everyone to provide professional knowledge light module !
Related Recommendation: the DAC Straight Cable