We present two cavity-stabilized lasers at 1555 nm, which are built to be the frequency source for a transportable photonic microwave generation system. The frequency instability reaches the thermal noise limit(7×10~(-16)) of the 10-cm ultra-low expansion glass cavity at 1-10 s averaging time and the beat signal of the two lasers reveals a remarkable linewidth of 185 mHz. We present two cavity-stabilized lasers at 1555 nm, which are built to the frequency source for a transportable photonic microwave generation system. The frequency instability reaches the thermal noise limit (7 × 10 ~ (-16)) of the 10-cm ultra-low expansion glass cavity at 1-10 s averaging time and the beat signal of the two lasers reveals a remarkable linewidth of 185 mHz.