Product Bulletin Variable Optical Backreflectors (VB8B Series) JDS Uniphase manual backreflectors provide precise levels of return loss to transmitters, which allows measurements of system sensitivity or system degradation as a function of backreflection. When used with a transmitter/ receiver pair and characterization equipment, the backreflectors can be used to establish the magnitude of reflections that significantly degrade transmission system performance and to characterize the problems they cause. Measurement Usage The backreflectors use JDS Uniphase's ultra -linear attenuator prism and highly reliable microlens technology, combined with a micrometer with electronic display of return loss. Two configurations of the VB8B backreflectors are available; no coupler and fused coupler. * * * * * The no coupler version has a single pigtail used as both an input and an output port. It can be used to generate very large levels of reflection. Alternatively, it can be used with an external coupler of the desired ratio to build customized reflection test sets. Applications The fused coupler version is equipped with a fused fiber coupler that splits the light, providing monitor and output ports as well as an input port. This version supplies lower maximum backreflection than the no coupler version because part of the input light is diverted to the output port. The monitor and output ports allow measurements to be made using a transmitter and a receiver. The backreflectors are battery-powered, which provides portability and compact packaging. * * * Specify the maximum allowable reflection level for connectors, receiver pigtails, and attenuators Verify optical isolator performance Select the most appropriate reflectioninsensitive light source for the system Key Features & Benefits * * * * Operation at 1300 or 1550 nm 0.02 dB resolution Low polarization sensitivity Constant insertion loss Long battery life Transmitter/receiver development and testing Reflection test for connectors Quality assurance acceptance testing Laser development and production Variable Optical Backreflectors (VB8B Series) | 2 Specifications PARAMETER Calibration wavelengths Maximum backreflection level 1 Minimum backreflection level 1 Linear range Insertion loss 1 (IN to OUT ) Calibration accuracy 2 Maximum optical input power Standard fiber type all ports Pigtail length Polarization dependent loss Resolution/setting capability Operating temperature Storage temperature Humidity 1. 2. FUSED COUPLER ( 30 / 70 ) NO COUPLER 1300 or 1550 nm 1300 or 1550 nm - 1.5 dB - 9.0 dB - 50 dB - 45 dB 30 dB 25 dB 5 dB 0.2 dB 0.5 dB 200 mW 200 mW single-mode 9/125 m cabled fiber with 3 mm jacket 1.5 m 1.0 dB 0.02 dB 0-40 C - 40-60 C maximum 95 % up to 40 C, 60 % above 40 C non-condensing With respect to input level and excluding external components or connectors (if installed). In linear range with unpolarized input. Ordering Information Sample Order: VB8B711+2ASU0 Indicate your requirements by selecting one option from each configuration table. Print the corresponding codes in the available boxes to form your part number. VB8B7 CODE CALIBRATED WAVELENGTH ( nm ) CODE CARRY CASE For more information on this or other products and their availability, contact your local JDS Uniphase sales representative or JDS Uniphase directly. 3 1 1300 1550 0 1 Without With JDS Uniphase Corporation 570 West Hunt Club Road Nepean (Ottawa), Ontario K2G 5W8 Canada Tel 613 727-1303 Fax 613 727-8284 instruments@jdsuniphase.com www.jdsuniphase.com +2A CODE MODEL CODE CONNECTOR T YPE 0 1 No Coupler Fused Coupler FP FA SC SU SP NC FC/HPC FC/APC SC/HPC SC/APC ST/HPC No connector All information contained herein is believed to be accurate and is subject to change without notice. No responsibility is assumed for its use. JDS Uniphase Corporation, its subsidiaries and affiliates, or manufacturer, reserve the right to make changes, without notice, to product design, product components, and product manufacturing methods. Some specific combinations of options may not be available. Please contact JDS Uniphase for more information. (c)JDS Uniphase Corporation. All rights reserved. MKT-DS-0113 Rev. 500 01/03/01