Polarisation insensitive semiconductor optical amplifierwith integratedelectroabsorption modulators

Abstract

The authors demonstrate a 1.55 µm wavelength multiquantum well semiconductor optical amplifier, integrated with bulk layer electroabsorption modulators and passive waveguide beam expanders at the input and output ports. The device has a fibre to fibre gain of 9 dB, an extinction ratio of 15 dB per modulator, a spectral range >35 nm, and polarisation sensitivity <1 dB.