The OLS-3155-5-E and OLS-8530-5-E optical light sources offer precise wavelengths (1310nm & 1550nm or 850nm & 1300nm) with stable output. They feature LD emitters, FC/PC connectors, and maintain short-term stability at <0.1dB and long-term at <0.2dB. With a spectral width of 5nm, frequencies of 270Hz, 1kHz, and 2kHz, and an output power of -5dBm±0.5dB, these units ensure accurate measurements. They include auto power-off, back-light, and operate in temperatures from -10°C to +50°C, with storage up to +70°C.