OLS7-3 triple-wavelength light source with wavelength ID. The light source outputs three wavelengths—1310/1550/1625 nm—from a single port. Each wavelength can be transmitted in CW mode or tone-modulated mode at frequencies of 270Hz, 350Hz, 1kHz, and 2kHz. Additionally, each wavelength can be transmitted with wavelength ID. The OLS7-3 output port is equipped with a removable adapter using a universal connector interface, facilitating inspection and cleaning of the output connector. OLS7-3 triple-wavelength light source with wavelength ID. The light source outputs three wavelengths—1310/1550/1625 nm—from a single port. Each wavelength can be transmitted in CW mode or tone-modulated mode at frequencies of 270Hz, 350Hz, 1kHz, and 2kHz. Additionally, each wavelength can be transmitted with wavelength ID. The OLS7-3 output port is equipped with a removable adapter using a universal connector interface, facilitating inspection and cleaning of the output connector.