Anritsu MG9638A Tunable Laser Source

The Anritsu MG9637A/9638A design meets these requirements through excellent wavelength repeatability, achieved by self-calibration and improved reliability using a new external cavity technology. The MG9637A/9638A utilize an external optical automatic power control (APC) module, the MG9637A has an Lithium Niobate modulator in the APC section to provide excellent output power stability and S/N ratio. The MG9638A uses a semiconductor amplifier providing a high-power output of at least +4 dBm.
Both laser sources are ideal for evaluating the wavelength loss characteristics and polarization mode dispersion (PMD) of optical devices (couplers, filters, etc.), as well as the gain and noise figure of optical fiber amplifiers and PMD used in dense wavelength division multiplexing (DWDM) systems.
The second output for the MG9637A & MG9638A is always on. The wavelegth is the same as output 1, However the power is significantly lower, > -10 dBm.