27-DB GAIN UNIDIRECTIONAL 1300-NM POLARIZATION-INSENSITIVE MULTIPLE-QUANTUM-WELL LASER-AMPLIFIER MODULE

An unidirectional polarization-insensitive multiple quantum well laser amplifier module for the 1300-nm window with a record high gain of 27 dB and a 3-dB saturation output power of 13 dBm is demonstrated. The module gain has a 3-dB width exceeding 60 nm and shows a typical polarization sensitivity and gain ripple as low as 0.3 dB, To provide immunity for backscattered or reflected light, polarization independent optical isolaters were inserted in the input and output coupling optics of the package, A practical optical amplifier module for the 1300-nm window is very desirable, because most of the presently installed fiber has its zero dispersion wavelength around 1310 mm, while much of the older fiber often only can be operated around this wavelength,