We have designed and fabricated a compact 4-array integrated SOA module using a novel parallel optical coupling scheme and polarization-insensitive built-in array isolators. We achieved ultra-high On/Off extinction ratio of more than 60dB and low cross talk of better than -60dB as well as high-isolation of over 47dB in wide wavelength ranges. We also developed a wavelength-insensitive parallel optical coupling scheme and an efficient thermal dissipating structure for a 4-array SOA module. We applied these technologies into 4-array SOA module fabrication and demonstrated a uniform optical coupling with the loss variance of 1dB over the 140-nm wavelength ranges. We also demonstrated simultaneous operation of 300mA × 4 channels with low thermal degradation of the module gain less than 1dB.