Over 19-dB Amplification at Whole C-band of 8-Channels Er-doped Waveguide Array with 15 × 15 mm 2 Foot Print

Gain characteristics of 8-channels Er-doped bismuthate waveguide array are measured under bidirectional pumping at 1480 nm. Over 19-dB gain with flatness of 2 dB at whole C-band has been obtained using a 25-cm long waveguide.