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US 2014/0369691 A1Published application
Ofdma overlay on legacy passive optical networks using optical nyquist filtering
AssigneeNEC Laboratories America, Inc.
InventorsAkihiro Tanaka, Neda Cvijetic
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Abstract
Methods and systems for combining signals include modulating data onto a first signal at a first frequency and wavelength; modulating data onto a second signal at a second wavelength using a modulation scheme that produces spectral components at the first frequency; filtering the second signal using an optical filter to suppress spectral components that would cause interference to the first signal; and combining the first signal and the second signal onto a transmission medium.
Claims12
A method for combining signals, comprising:
- modulating data onto a first signal at a first frequency and wavelength;
- modulating data onto a second signal at a second wavelength using a modulation scheme that produces spectral components at the first frequency;
- filtering the second signal using an optical filter to suppress spectral components that would cause interference to the first signal;
- and
- combining the first signal and the second signal onto a transmission medium.
2 more elements
A system for combining signals, comprising:
- a first transmitter configured to modulating data onto a first signal at a first frequency and wavelength;
- a second transmitter configured to modulate data onto a second signal at a second wavelength using a modulation scheme that produces spectral components at the first frequency;
- a filter configured to suppress the spectral components in the second signal that would cause interference to the first signal;
- and
- a combiner configured to combine the first signal and the second signal onto a transmission medium.
2 more elements
Dependencies are inferred from the claim text.