We introduce the first high-throughput forward error correction (FEC) decoder capable of decoding oFEC. With a flexible/reconfigurable BCH inner code, the proposed decoder enables adaptive and reliable inter-satellite optical communication. It features unprecedented configurability in terms of Galois field (GF) size, code length, code rate, parallel factor, and coding gain providing a trade-off between error correction performance, energy, and throughput. Implemented in 12nm CMOS technology, the decoder achieves a throughput of 33.06 Gb/s, an energy efficiency of 40.35 pJ/b, and a net coding gain of 7.27 dB at 10-6 BER with an oFEC using inner BCH (255,223), marking a 1.9-5.2× in throughput and 1.5-2.6 dB gain over prior work.