Combination photonic time and wavelength division multiplexer
US6256124A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 1998 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | May 8, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A delayed-pulse photonic time division multiplexer which provides a parallel digital data to photonic serial conversion is disclosed. Modifications which provide wavelength division multiplexing are also included. A series of input pulses of photonic energy are directed into an output as sync pulses. The input pulses are also directed into a group of n optical modulators to read parallel digital data that has been loaded into the modulators. Modulator outputs are delayed by digit-transmission-time intervals and directed into the output as serial data between the sync pulses. Input pulses are also used to trigger the loading of the next data set into the modulators during the time that the previous data set is being transmitted in serial. The invention can send serial data at the maximum speed of optical components while using data from slower electronic components. The invention can also use all-photonic components and signals, including frequency-multiplexed signals, with its time division multiplexing functions for each frequency channel. Outputs can use a variety of modulation forms, including multistate semaphores.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.