1550nm Butterfly Single-Frequency Laser，40mW，SM Fiber，FC/APC

The SFL1550S laser is a single-frequency laser source with spectral properties comparable to a DFB laser but with narrower linewidth and higher output power. Applying proprietary stabilization techniques, a single-frequency, external cavity semiconductor laser is provided in a compact, 14-pin butterfly package. The single-frequency laser contains an integrated thermoelectric cooler, thermistor, and optical isolator with a single mode output fiber tail.