{"product_id":"exfo-fiberbasix-els-50-optical-light-source-60-hour-battery-0-10db-stability-1310-1550nm","title":"EXFO ELS-50 Optical Light Source – 1310\/1550nm, 60-Hour Battery, ±0.10dB Stability","description":"\u003ch2\u003eEXFO ELS-50 Optical Light Source – 1310\/1550nm Dual Wavelength, 60-Hour Battery\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eEXFO ELS-50\u003c\/strong\u003e is a professional dual-wavelength optical light source designed for \u003cstrong\u003efiber optic insertion loss testing\u003c\/strong\u003e in FTTH, telecom, and CATV networks. Trusted by field technicians worldwide, it delivers \u003cstrong\u003e±0.10dB output stability\u003c\/strong\u003e at both \u003cstrong\u003e1310nm and 1550nm\u003c\/strong\u003e — the two standard singlemode wavelengths — powered entirely by standard AA batteries for up to \u003cstrong\u003e60 hours of continuous operation\u003c\/strong\u003e. No charging, no proprietary packs. Just reliable, repeatable measurements all day in the field.\u003c\/p\u003e\n\n\u003cp\u003ePair it with the \u003cstrong\u003eEXFO EPM-50 Optical Power Meter\u003c\/strong\u003e for a complete, matched \u003cstrong\u003einsertion loss test set\u003c\/strong\u003e from a single trusted brand.\u003c\/p\u003e\n\n\u003ch2\u003eKey Specifications at a Glance\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eELS-50 (Model 23BL)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWavelengths\u003c\/td\u003e\n\u003ctd\u003e1310nm \/ 1550nm (singlemode)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Power\u003c\/td\u003e\n\u003ctd\u003e≥ −5 dBm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Stability\u003c\/td\u003e\n\u003ctd\u003e±0.10 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpectral Width\u003c\/td\u003e\n\u003ctd\u003e≥ 5nm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTone Generation\u003c\/td\u003e\n\u003ctd\u003e270Hz \/ 1kHz \/ 2kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBattery Life\u003c\/td\u003e\n\u003ctd\u003e60 hours (standard AA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eInterchangeable: FC, SC, ST, LC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e189 × 78 × 37 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e400g (0.9 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temp\u003c\/td\u003e\n\u003ctd\u003e−10°C to +50°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e1 Year\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhy Field Technicians Choose the EXFO ELS-50\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e60-Hour Battery Life on AA Batteries:\u003c\/strong\u003e Over 2.5 days of uninterrupted field testing — no charging infrastructure needed, no proprietary battery packs to replace or carry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e±0.10dB Power Stability:\u003c\/strong\u003e Consistent, repeatable output ensures accurate insertion loss measurements across all test conditions and temperatures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Wavelength 1310\/1550nm:\u003c\/strong\u003e Tests both standard singlemode telecom wavelengths in a single compact instrument — ideal for FTTH, OSP, and enterprise fiber networks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e270\/1k\/2kHz Tone Generation:\u003c\/strong\u003e Identify and trace individual fibers in multi-fiber cables without interrupting live service — up to 60 hours of tone output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterchangeable Connector Adapters:\u003c\/strong\u003e Field-swappable FC, SC, ST, and LC adapters for maximum flexibility across all connector types. FC adapter included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged EXFO Platform:\u003c\/strong\u003e Built for demanding outdoor environments; trusted by telecom operators, contractors, and network integrators globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight:\u003c\/strong\u003e 400g, 189×78×37mm — fits in a tool bag or jacket pocket for easy field carry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerfect Pair with EXFO EPM-50:\u003c\/strong\u003e Matched form factor, AA battery platform, and EXFO FiberBasix reliability for a complete insertion loss test set.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat Is the EXFO ELS-50 Used For?\u003c\/h2\u003e\n\u003cp\u003eThe ELS-50 is the light source half of a two-instrument \u003cstrong\u003eoptical loss test set (OLTS)\u003c\/strong\u003e. It injects stable optical power into the fiber under test; a calibrated power meter (such as the EXFO EPM-50) at the far end measures received power. The difference — in dB — is the \u003cstrong\u003einsertion loss\u003c\/strong\u003e of the fiber link. This test is required for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFTTH \/ FTTx network installation and acceptance testing\u003c\/strong\u003e — verifying fiber links meet operator loss budgets before service activation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTelecom OSP construction and maintenance\u003c\/strong\u003e — testing aerial, underground, and in-building fiber runs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCATV fiber plant testing\u003c\/strong\u003e — measuring loss in hybrid fiber-coax (HFC) distribution networks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnterprise and data center fiber certification\u003c\/strong\u003e — validating structured cabling for 10G\/40G\/100G applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFiber identification\u003c\/strong\u003e — using 270Hz\/1kHz\/2kHz tone to trace specific fibers in multi-fiber cables\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eEXFO ELS-50 vs. Competitors: What Makes It Different?\u003c\/h2\u003e\n\u003cp\u003eMost optical light sources in this class use rechargeable lithium batteries with 8–20 hour runtimes, requiring overnight charging between shifts. The \u003cstrong\u003eEXFO ELS-50 runs 60 hours on standard AA batteries\u003c\/strong\u003e — available anywhere in the world — eliminating charging downtime and proprietary battery costs. Combined with EXFO's proven ±0.10dB stability and the interchangeable connector system, the ELS-50 delivers a lower total cost of ownership for field teams running multi-day projects.\u003c\/p\u003e\n\n\u003ch2\u003eComplete Insertion Loss Test Set: ELS-50 + EPM-50\u003c\/h2\u003e\n\u003cp\u003eThe ELS-50 is engineered to pair with the \u003cstrong\u003eEXFO FiberBasix EPM-50 Optical Power Meter\u003c\/strong\u003e. Together they form a complete, matched OLTS:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eELS-50 injects stable 1310nm or 1550nm optical power into the fiber\u003c\/li\u003e\n\u003cli\u003eEPM-50 measures received power at the far end and displays insertion loss in dB after referencing\u003c\/li\u003e\n\u003cli\u003eBoth share the same compact form factor, AA battery platform, and EXFO FiberBasix reliability\u003c\/li\u003e\n\u003cli\u003eSingle-brand accountability for calibration, support, and warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSee our \u003cstrong\u003eEXFO EPM-50 listing\u003c\/strong\u003e to complete your test set.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the EXFO ELS-50?\u003c\/strong\u003e\u003cbr\u003e\nA: The EXFO ELS-50 is a professional dual-wavelength optical light source that outputs stable optical power at 1310nm and 1550nm for fiber optic insertion loss testing. It is part of the EXFO FiberBasix series and is designed to pair with the EXFO EPM-50 power meter.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What power meter is compatible with the EXFO ELS-50?\u003c\/strong\u003e\u003cbr\u003e\nA: The ELS-50 is designed to pair with the \u003cstrong\u003eEXFO FiberBasix EPM-50 Optical Power Meter\u003c\/strong\u003e for a complete insertion loss test set. Both instruments share the same compact form factor, AA battery platform, and EXFO FiberBasix reliability.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How long does the battery last on the EXFO ELS-50?\u003c\/strong\u003e\u003cbr\u003e\nA: The ELS-50 runs on standard AA batteries with \u003cstrong\u003e60 hours of continuous operation\u003c\/strong\u003e — over 2.5 days of uninterrupted field testing. This eliminates the need for charging infrastructure and avoids proprietary battery pack costs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What connector types does the EXFO ELS-50 support?\u003c\/strong\u003e\u003cbr\u003e\nA: The ELS-50 features interchangeable connector adapters supporting \u003cstrong\u003eFC, SC, ST, and LC\u003c\/strong\u003e connector types. The FC adapter is included; additional adapters are available separately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is tone generation on the ELS-50 and how is it used?\u003c\/strong\u003e\u003cbr\u003e\nA: The ELS-50 modulates its optical output at \u003cstrong\u003e270Hz, 1kHz, or 2kHz\u003c\/strong\u003e. When used with a compatible power meter or fiber identifier, this tone allows technicians to identify and trace specific fibers within a multi-fiber cable without interrupting live service — up to 60 hours of tone output.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is the EXFO ELS-50 suitable for FTTH testing?\u003c\/strong\u003e\u003cbr\u003e\nA: Yes. The ELS-50 is widely used for FTTH\/FTTx network installation and acceptance testing, verifying that fiber links meet operator loss budgets at both 1310nm and 1550nm before service activation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is the output power stability of the EXFO ELS-50?\u003c\/strong\u003e\u003cbr\u003e\nA: The ELS-50 delivers \u003cstrong\u003e±0.10dB power stability\u003c\/strong\u003e, ensuring consistent and repeatable insertion loss measurements across all test conditions and operating temperatures.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is included in the EXFO ELS-50 package?\u003c\/strong\u003e\u003cbr\u003e\nA: The package includes the ELS-50 light source main unit, AA batteries, FC connector adapter, quick reference sticker, certificate of compliance, and soft carrying pouch.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What warranty does the EXFO ELS-50 come with?\u003c\/strong\u003e\u003cbr\u003e\nA: The ELS-50 comes with a \u003cstrong\u003e1-year warranty\u003c\/strong\u003e and certificate of compliance. For support or bulk\/B2B pricing, contact us at info@splicermarket.com.\u003c\/p\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eEXFO ELS-50 Light Source Main Unit\u003c\/li\u003e\n\u003cli\u003eAA Batteries\u003c\/li\u003e\n\u003cli\u003eFC Connector Adapter\u003c\/li\u003e\n\u003cli\u003eQuick Reference Sticker\u003c\/li\u003e\n\u003cli\u003eCertificate of Compliance\u003c\/li\u003e\n\u003cli\u003eSoft Carrying Pouch\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"EXFO","offers":[{"title":"Default Title","offer_id":52368860053816,"sku":null,"price":1299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0058\/7923\/4648\/files\/els-50_05882695-9882-4be7-a2a8-f28700da8a74.png?v=1778745395","url":"https:\/\/comway-technology.myshopify.com\/products\/exfo-fiberbasix-els-50-optical-light-source-60-hour-battery-0-10db-stability-1310-1550nm","provider":"Fusion Splicer Store","version":"1.0","type":"link"}