Optical data transmission method and its system, optical transmitter and its method, and optical switcher
AssigneeKddi Corporation
InventorsYukio Horiuchi, Shu Yamamoto
Life of this patent
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Abstract
This invention discloses a method to easily extract a header from an optical packet. An optical data transmission method to transmit an optical packet composed of a header and data containing steps of generating a second clock which has a frequency equal to one integer of that of a first clock carrying the data and synchronizes with the first clock, and carrying the header information on the second clock.
Claims10
An optical data transmission method to transmit an optical packet composed of a header and data comprising steps of:
- generating a second clock which has a frequency equal to one integer of that of a first clock carrying the data and synchronizes with the first clock;
- and
- carrying the header information on the second clock.
An optical data transmission system to transmit an optical packet composed of a header and data characterized by that the header information is carried on a second clock which has a frequency equal to one integer of that of a first clock carrying the data and synchronizes with the first clock.
An optical transmitter to output an optical packet composed of a header and data, comprising:
- a frequency divider to generate a second clock which synchronizes with a first clock carrying the data and has a frequency equal to one integer of that of the first clock;
- a phase modulator to modulate a phase of the second clock by the header information;
- and
- a data arranger to arrange the first clock carrying the data after the output data from the phase modulator.
An optical transmission method to output an optical packet composed of a header and data, comprising steps of:
- generating a second clock which synchronizes with a first clock carrying the data and has a frequency equal to one integer of that of the first clock;
- modulating a phase of the second clock with the header information;
- and
- arranging the first clock which carries the data after the phase-modulated second clock.
An optical switcher to switch an optical packet signal composed of a data carried on a first clock and a header carried on a second clock which has a frequency equal to one integer of that of the first clock and synchronizes the first clock, comprising:
- a plurality of optical input terminals;
- a plurality of optical dividers to divide each input light of the plurality of the optical input terminals into two portions;
- a plurality of header extractors to extract the header from one of the two portions divided by each of the plurality of the dividers;
- a plurality of optical delays to delay the other of the two portions divided by each of the plurality of the optical dividers for a predetermined period;
- an optical route switcher to switch a route of each output light from the plurality of the optical delays;
- and
- a switch controller to determine a route of an optical signal to enter the corresponding optical input terminal and to control the optical route switcher according to output from each of the plurality of the header extractors.
Dependencies are inferred from the claim text.