Check the listing for details. LS-345 Fiberpia Optical Light Source. Condition: Used. Listed at 100.00 USD. LS-345 series are easy-to-use testing instruments for optical fiber test and laser-based light sources designed to test single mode fiber optic links. They provide power meters with a stable output ApplicationsOptical fiber component manufacture & test CWDM component and system test Other occasion where need stable light source Featureswavelength:1310,1550,1490nm / Dust and shock proof design Auto shut off function / CWDM laser is available High stable optical power / Low warm up & stable High stable output power / Very easy-to-useThe LS-345 is used with a power meter for measuring optical loss on single mode fiber cable. High laser stability is guaranteed, power output is unaffected by varying back reflection. The LS-345 operates on disposable batteries or AC adapter. A Low battery indication warns the user that battery replacement is necessary. The optical output is via a top panel FC, SC, or ST connector. The output may be equipped with other style connectors upon request. The center wavelength of the light source is measured at the point of peak intensity. Light sources emit a range of wavelengths, not just one. The difference between the lowest and the highest frequency of light is called the spectral width. For practical purposes, spectral width is measured at Full Width-Half Maximum (FWHM); the width (Full Width) is measured at the point exactly halfway between zero power and peak power (Half Maximum). Careful use of this source will provide years of reliable service.