Highly Reliable Optical Fiber Distribution Facilities in Central Office Employing Single-mode Hole-assisted Fiber Cord

We realized single-mode hole-assisted optical fiber (HAF) cord whose fiber has a superior bending loss characteristic that complies with ITU-T Recommendation G. 657 for use in highly reliable optical fiber distribution facilities in central offices. The cord has an excellent anti-shock characteristic, and can be detected with a conventional optical fiber cord identifier despite its very low bending loss. We also developed optical jumper units and indoor cables employing the cord for optical fiber distribution in integrated distribution modules (IDM) and central offices, respectively, which achieved almost the same characteristics as conventional facilities. These results show that the single-mode HAF cord we developed and its application to optical fiber distribution in central office can provide a highly reliable network service.