EDFA Series and Raman Optical Amplifier Series are used in optical transmission system to increase transmission distance. The products are Telcordia GR-1312-CORE qualified. EDFA-Booster Amplifier 　 EDFA-Line Amplifier 　 EDFA-Preamplifier Amplifier 　 EDFA-TV Series 　 EDFA-MD Gain Module Series 　 EDFA-MW Gain Module Series 　 EDFA-MC Gain Moduel Series 　 EDFA-GW Gain Block Series 　 EDFA-GC Gain Block series 　 EDFA- L-band Gain Block/ Module Series 　 Raman Optical Amplifier Series 　 RT-EDFA Series