The IQS-2700 tunable external-cavity laser for testing optical systems and components is available from Exfo Electro-Optical Engineering Inc. in three configurations. The model for the C- and L-bands, from 1525 to 1625 nm, has high-power output for testing amplifiers and network components. The version for the S-, C- and L-bands, from 1460 to 1625 nm, is optimized for coarse wavelength division multiplexing and fiber-to-premises testing; and the one for the E- and S-bands covers 1425 to 1525 nm. The latter two devices have low-noise power output for characterizing stopband and passband filters. The small-form-factor laser is housed in the IQS-500 Intelligent Test System.