ARRIS GX2-OA508B21 Posted on August 2, 2015August 13, 2015 by wpadmin The ARRIS GX2-OA508B21 Optical Amplifier is designed for use with the OmniStar GX2 1550 nm DWDM transmitters. With adjustable output powers available, the GX2-OA508 EDFA accomodates a range of link budgets and launch powers.