Fiber optic telephone loop network
US5349457A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1993 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Jan 28, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q2011/0081
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Novel fiber optic telephone loop networks are disclosed. In the networks, single mode fiber optics are used for feeder and distribution segments of the loop but multimode fiber optics are used for the drops. The use of the multimode fiber optics has permitted the use of less costly optoelectronic devices. Surface light emitting diodes are such economical but reliable parts. Fiber service terminals located near subscriber premises convert single mode operation to the multimode operation. The networks are relatively easy to install and upgrade and are very economically competitive with other known FTTC and FTTH schemes. In a further embodiment, the fiber service terminals have microprocessor control to reroute signals via redundant single mode connections to central switching office in the event of a fault in a single mode fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.