Return Loss Module with integrated Laser Source, 1310/1550 nm Agilent's (now Keysight) 81613A Return Loss module is the tool of choice for measuring return loss (RL) and reflection of single-mode fiberoptic components. The module measures the optical power into and reflected back from the device under test and calculates and displays the return loss. Thorough built-in functionality provides the correct coupling and detection ratios and eliminates the effects of dark current and residual backscatter in the instrument setup to provide accurate measurements over a wide dynamic range. The Return Loss modules can be used in any 816x Lightwave mainframe and with the internal Fabry-Perot light source or an external fixed-wavelength or tunable laser source. The performance and usability is enhanced by combination with an Agilent power sensor in the 8163B mainframe for simultaneous RL and insertion loss measurements, especially in combination with the 81610CC calibrated reference cable. Automated use is supported by the 816x Plug&Play Driver, which also supports use of the module for advanced swept-wavelength RL measurements. Source: Fabry-Perot Laser (internal) Fiber type: Standard single-mode 9/125 um Return loss dynamic range: 75 dB Return loss uncertainty down to +/- 0.2 dB with broadband source Center wavelength 1310 nm/1550 nm +/- 20 nm typ. Built-in Power Monitor and Laser Source Built-in step-by step guided wizard with 8163B mainframe Factory calibrated values High RL dynamic range provides most accurate measurement of RL and IL up to 75 dB, enables better product specifications One test setup can be used for DUTs in all transmission bands Built-in power monitor and built-in source provides RL measurements with highest stability and accuracy Built-in laser source allows self-calibration during test and reduces time-consuming recalibration steps Built-in RTL-wizard simplifies accurate calibration and measurement Factory calibrated parameters let you instantly start with the return loss measurement