What is the difference between the automatic laser shutdown characteristics of the N2BPA and N1BPA of the OSN3500 device?

Operation Procedure

1, N1BPA consists of two EDFA optical modules, N2BPA consists of one EDFA optical module, in the laser automatic shutdown function is not turned off (the default is on), as long as there is no optical signal input in one of the ports IN1 (i.e., BA's IN port) and IN2 (i.e., PA's IN port), it will lead to laser shutdown, and even if there is light input from one of the optical ports IN1 and IN2, its corresponding OUT1 or OUT2 will not amplify the incoming light, but will not amplify the incoming light. When there is light input, its corresponding OUT1 or OUT2 not only will not amplify the input light, but will produce an attenuation of 10 or so dbm (e.g., IN2 port is -60dbm, OUT port is -60dbm, and when IN1 is 0.9dbm, OUT1 is -17.8dbm).

2. The BA and PA modules of N1BPA are independent of each other and do not affect each other.

3, N2BPA and N1BPA are conditional substitution relationship, N2BPA need to turn off the ALS function when substituting for N1BPA.

4、The working principle of N2BPA and N1BPA is shown in the following figure, the upper figure is N2BPA and the lower figure is N1BPA:

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