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US 7,110,681 B1Granted
Method and apparatus for optical transmission
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTakashi Mizuochi
Life of this patent
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Abstract
Binary information is subjected to RZ encoding and multi-level encoding, and the encoded signal is optically modulated.
Claims8
Optical transmission equipment comprising:
- a source configured to output binary information;
- an encoder configured to perform RZ encoding and multi-level encoding of said binary information;
- a modulator configured to perform RZ optical modulation of the encoded signal from said encoder;
- a transmitter configured to transmit the encoded signal optically modulated by said modulator;
- a receiver configured to receive the encoded signal transmitted by said transmitter;
- and
- a decoder configured to perform NRZ decoding and multi-level decoding of the encoded signal received by said receiver, wherein said decoder performs the NRZ decoding before the multi-level decoding of the encoded signal;
- and
- a multiplexer configured to multiplex the decoded multi-level signal and output the binary information.
6 more elements
An optical transmission method wherein:
- a transmitting side
- receives binary information;
- performs RZ encoding and multi-level encoding of said binary information;
- RZ optical modulates and transmits the encoded signal;
- and
- transmits the optical modulated encoded signal;
- and
- a receiving side
- receives the optical modulated and encoded signal;
- performs NRZ decoding and multi-level decoding of the received encoded signal, wherein the NRZ decoding is performed before the multi-level decoding of the encoded signal;
- and
- multiplexes the multi-level signal and outputs the binary information.
9 more elements
Optical transmission equipment comprising:
- means for outputting binary information;
- means for performing RZ encoding and multi-level encoding of said binary information;
- means for performing RZ optical modulation of the encoded signal from said means for performing RZ encoding;
- means for transmitting the encoded signal optically modulated by said means for performing RZ optical modulation;
- means for receiving the encoded signal transmitted by said means for transmitting;
- means for performing NRZ decoding and multi-level decoding of the encoded signal received by said means for receiving, wherein said means for performing NRZ decoding performs the NRZ decoding before the multi-level decoding of the encoded signal;
- and
- means for multiplexing the decoded multi-level signal and for outputting the binary information.
5 more elements
Dependencies are inferred from the claim text.