C-Band & L-Band Photosensitive Erbium-Doped Fiber Nufern’s high performance PS-ESF-3/125 is the ideal fiber for distributed feedback (DFB) and distributed Bragg reflector (DBR) lasers. Engineered to be inherently photosensitive, these fibers enable short device lengths and good pump conversion efficiency. Variants of this fiber with higher gain and/or photosensitivity are available upon request as custom products. Typical Applications Features & Benefits • Ultra-short very narrow linewidth all- • Inherently photosensitive with moderate Er dopant concentration—Enables short length devices with a superimposed optical DFB and DBR lasers fiber grating structure • High efficiency—Good conversion of pump to signal power • Perfectly matched passive fiber available—Facilitates the construction of fiber-based components and pigtails with low pump and signal coupling losses Optical Specifications Operating Wavelength (nominal) Core NA Mode Field Diameter Cutoff Core Absorption PS-ESF-3/125 1550 nm 0.280 5.0 ± 1.0 µm @ 1550 nm 920 ± 50 nm 8.5 ± 1.0 dB/m near 1530 nm Geometrical & Mechanical Specifications Cladding Diameter Core Diameter Coating Diameter Coating Concentricity Core/Clad Offset Coating Material Operating Temperature Range Prooftest Level 125.0 ± 1.0 µm 3.0 µm 245.0 ± 15.0 µm < 5.0 µm ≤ 0.50 µm UV Cured, Dual Acrylate -40 to 85 °C ≥ 100 kpsi (0.7 GN/m²) The passive version of this fiber is also available. 7 Airport Park Road, East Granby, CT 06026 • 860.408.5000 • Toll-free 866.466.0214 • Fax 860.844.0210 E-mail info @ nufern.com • www.nufern.com Nufern products are manufactured under an ISO 9001:2008 certified quality management system. Standard specifications and design parameters are listed above. Specifications are subject to change without notice. Other configurations such as alternative form factors, optimized cut-off and UV cured color coating may be available. Let us know how Nufern can assist with your requirements. NU0109- 12/16/2011