Wavelength division multiplexed optical communication system having variable channel spacings and different modulation formats
US8639118B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2010 |
| Grant date | Jan 28, 2014 |
| Priority date | — |
| Expiry date | Aug 17, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/34
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Consistent with the present disclosure, data, in digital form, is received by a transmit nodes of an optical communication, and converted to analog signal by a digital-to-analog converter (DAC) to drive a modulator. The modulator, in turn, modulates light at one of a plurality of wavelengths in accordance with the received data. The modulated light is then transmitted over an optical communication path to a receive node. At the receive node, the modulated optical signal, as well as other modulated optical signals are supplied to a photodetector circuit, which receives additional light at one of the optical signal wavelengths from a local oscillator laser. An analog-to-digital converter (ADC) is provided in the receive node to convert the electrical signals output from the photodetector into digital form. The output from the ADC is then filtered in the electrical domain, such that optical demultiplexing of individual channels is unnecessary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.