100 Gbit/s OFDM optical signal generation
AssigneeNEC Laboratories America, Inc.
InventorsJianjun Yu, Ting Wang
Life of this patent
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Abstract
A method includes modulating lightwaves to provide first and second OFDM signal sidebands at a first polarization direction and first and second OFDM signal sidebands at a second polarization direction, and combining sidebands that are oppositely positioned and joined from the first and second OFDM signal sidebands at each polarization direction to provide a polarization multiplexing OFDM signal.
Claims9
An apparatus for generating a 100 Gbit/s orthogonal frequency division multiplexed (OFDM) signal, the apparatus comprising:
- a laser that generates an unmodulated optical signal,
- four data sources that generate base-band data streams one through four,
- four electrical mixers that mix the four base-band data streams at a frequency, f, to generate four up-converted data streams,
- at least one optical splitter that splits the unmodulated optical signal into four optical signals,
- a first through fourth optical intensity modulator, each intensity modulator configured to modulate one of the four optical signals with one of the up-converted data streams, thereby generating a carrier suppressed optical signal with at least two sidebands,
- a first optical interleaver configured to combine an upper sideband from the first intensity modulator with a lower sideband from the second intensity modulator to generate a first frequency division multiplexed (FDM) optical signal,
- a second optical interleaver configured to combine an upper sideband from the third optical modulator with a lower sideband from the fourth intensity modulator to generate a second FDM optical signal, and
- a polarization beam combiner (PBC) that combines one polarization of the first FDM optical signal with an orthogonal polarization of the second FDM optical signal, thereby generating a 100 Gbit/s OFDM signal.
A method for generating a 100 Gbit/s orthogonal frequency division multiplexed (OFDM) signal, the method comprising the steps of:
- generating, responsive to a laser, an unmodulated optical signal,
- generating, responsive to four data sources, base-band data streams one through four,
- mixing, responsive to four electrical mixers, the four base-band data streams at a frequency, f, to generate four up-converted data streams,
- splitting, responsive to at least one optical splitter, the unmodulated optical signal into four optical signals,
- modulating, responsive to a first through fourth optical intensity modulator, one of the four optical signals with one of the up-converted data streams, thereby generating a carrier suppressed optical signal with at least two sidebands,
- combining, responsive to a first optical interleaver, an upper sideband from the first intensity modulator with a lower sideband from the second intensity modulator to generate a first frequency division multiplexed (FDM) optical signal,
- combining, responsive to a second optical interleaver, an upper sideband from the third optical modulator with a lower sideband from the fourth intensity modulator to generate a second FDM optical signal, and
- combining, responsive to a polarization beam combiner (PBC), one polarization of the first FDM optical signal with an orthogonal polarization of the second FDM optical signal, thereby generating a 100 Gbit/s OFDM signal.
Dependencies are inferred from the claim text.