An Attenuated Patch Cord is designed to attenuate an optical signal, usually to keep the detectors response in the linear region.A patch cord with fixed built-in attenuation is a cost-effective alternative to an attenuated adapter. A disadvantage with an extra adapter is that some reflection loss is introduced into the system. However, this problem can be avoided with an attenuated patch cord. GH high performance attenuated patch cords can be installed in place of conventional patch cords to provide a constant level of attenuation with more than 50DB return loss, they are compact, multipurpose passive devices designed to operate in 1310nm and 1550nm wavelengths. Attenuated Patch Cord can be provided with several different connectors styles with lengths up to 20 meters to meet varied customer requirements.