PDFA for reach extension of 100GBASE-LR4
Summary
This technical article describes an application of FiberLabs PDFA for extending the reach of 100GBASE-LR4 transmission.
20 dB link budget using as booster amplifier
First, AMP-FL5600-OB-16 was used as the booster amplifier. The four signals from a 100GBASE-LR4 CFP were directly connected to the amplifier and were amplified by more than 10 dB per lane. Gain variation between the lanes was less than 1 dB. A link budget of 20dB was confirmed by using 55 km of SMF and an optical attenuator.
20 dB link budget using as pre-amplifier
In the second scheme, a pre-amplifier configuration was used. The four wavelength signals were simultaneously amplified by AMP-FL5600-OB-13 to be within the range of receiver sensitivity after being attenuated by 23dB/lane using 55 km of SMF and an optical attenuator. A link budget of greater than 20 dB was confirmed.
30 dB link budget using as both booster amplifier and pre-amplifier
Finally, AMP-FL5600-OB amplifiers were used as both the booster amplifier and pre-amplifier. A link budget of greater than 30dB was confirmed using 60 km of SMF and an optical attenuator.
Further reach extensions using as inline amplifiers
It should be noted that the reach is not limited to 60 km, but a larger link budget and further reach extension should be possible by using inline amplifiers in addition to the booster amplifier and pre-amplifier.