[j-nsp] acceptable/good laser receive power in case of different interfaces

[Martin T]

What is the acceptable Rx power in case of SFP/XFP? For example, here
are XFP Tx and Rx signals from six FXP's:

1:
Laser output power                        :  1.2920 mW / 1.11 dBm
Laser rx power                            :  0.0285 mW / -15.45 dBm

2:
Laser output power                        :  0.6420 mW / -1.92 dBm
Laser rx power                            :  0.3054 mW / -5.15 dBm

3:
Laser output power                        :  0.4230 mW / -3.74 dBm
Laser rx power                            :  0.5092 mW / -2.93 dBm

4:
Laser output power                        :  0.4180 mW / -3.79 dBm
Laser rx power                            :  0.4208 mW / -3.76 dBm

5:
Laser output power                        :  1.0920 mW / 0.38 dBm
Laser rx power                            :  0.1801 mW / -7.44 dBm

6:
Laser output power                        :  0.7680 mW / -1.15 dBm
Laser rx power                            :  0.3337 mW / -4.77 dBm


Is there some sort of pattern? It looks like if the Rx signal is
lower, the Tx is higher? And what can one consider a decent Rx laser
power level?


regards,
martin