Programmable optical vector modulator and method for use in coherent optical communications
US7085500B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 2001 |
| Grant date | Aug 1, 2006 |
| Priority date | — |
| Expiry date | Apr 3, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/50
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A transmitter comprising a programmable optical vector modulator and method for coherent optical signal communication. The transmitter includes a transmitter laser whose output is coupled by way of an optical fiber to an amplitude modulator. The output of the amplitude modulator is coupled by way of a length of optical fiber to a phase modulator. The phase modulator generates a modulated light output from the transmitter. Amplitude modulation is achieved by inputting data and a data clock signal to amplitude symbol mapping logic whose outputs are selectively weighted, summed, amplified and input to the amplitude modulator to amplitude modulate the output of the transmitter laser. Phase modulation is achieved by inputting the modulating data and the data clock signal to phase angle symbol mapping logic whose outputs are selectively weighted, summed, amplified, delayed to synchronize with the arrival of the light from the amplitude modulator, and input to the phase modulator to phase modulate the amplitude modulated output of the transmitter laser. The programmability of the vector modulator allows the transmission of an M-ary modulation format that maximizes the data transmission fo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.