Most receiver modules can accept signals at either 1310 or 1550nm wavelengths (although the vendor typically will not test at both). That said, it is best practice to match the optics at both ends of a link, as it makes for simplified troubleshooting. Also, attenuation is lower at 1550nm and may require the addition of optical attenuation to make sure that the receive optical power level does not exceed the receiver's limits of operation.

我特意搜了一下。

大概意思是收发模块一般两种波长都能接受，但是厂家可能没去做过这种混用的测试，最佳的匹配方式还是要一致。另外1550nm的衰减小，1550的发光功率不要超过1310nm模块的接收的功率，因此有可能需要增加光学衰减设备。