High recovery of long-term cash the following equipment: the 81689A the small tunable laser light source into the 8163A lightwave multimeter host, together with the power meter module can constitute a compact portable Loss Tester. Its tunable wavelength EDFA window device and the link so that we can check. 8164A Lightwave Measurement System Agilent 8164A test fiber optical components of the new platform supports a full range of tunable laser source module and 8153A, and 8163A lightwave multi-instrument series modules. 8164A has the characteristics of the various control devices connected via GPIB, and PC card interface. The configurable hardware input and output triggers Port 8164A can run automated environment. The 8164A also includes a 3.5 "floppy disk drive, VGA port (RS232C serial interface), keyboard interface and parallel printer port. The gain band tunable laser light source · 81680A and 81682A module work in the 1550nm band while 81640A covering the wavelength range of 1510nm to 1640 nm. · The best tuning accuracy, especially for testing critical dense wavelength division multiplexing (DWDM) devices. 81640A, 81680A and 81682A tunable laser source module has a built-in wavelength control loop, to promote the development of today's technology, challenging measurement limit. Continuous output power conditions to achieve mode-hop free tuning, suitable for the most critical test of DWDM components. All three modules are suitable for the bottom slot loaded into the 8164A host.