Novel hybrid passive componet for EDFA

摘要

In this paper, a novel hybrid passive component for EDFA was reported. This component integrated the 1550 nm polarization independent optical isolator and the 980/1550 nm pump WDM within a single compact case, and realized the reduction of insertion loss, cost and package size. The following techniques were adopted in fabricating this component: (1) high efficiency beveled end-face off-axis coupling between twin core ferrule and GRIN rod; (2) the pump WDM is based on GRIN rod and optical interference filter; (3) the optical polarization independent isolator using birefringence wedge, etc. This component was packaged in an ordinary isolator case as small as $Phi@8 $MUL 40 mm. The insertion loss of signal is less than 0.9 dB; the insertion loss of pump is less than 0.8 dB; the isolation of the built in isolator is more than 42 dB with $POM@15 nm pass-band and the return loss is more than 50 dB. This component has shown very stable performance against the environmental changes. It had been applied to a single forward pumped EDFA module, and has achieved the following good performance: more than 29 dB small signal gain, less than 5 dB noise figure, more than $PLU@10 dBm output power. The EDFA module has the dimension largely reduced to 15 $MUL 100 $MUL 130 mm.