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US 5,847,852 AGranted
Optical network
AssigneeNEC Corporation
InventorsWataru Domon, Makoto Shibutani
Life of this patent
Estimating the term…
Abstract
Disclosed is an optical network which has a plurality of subordinate optical networks, each of which being connected with a plurality of optical terminals which function as a transmitter and a receiver of a signal light, wherein multiplexing of transmission signals and demultiplexing of reception signals at the optical terminals are carried out in the subcarrier multiplexing manner; and a main optical network which is connected with the subordinate optical networks, wherein multiplexing of signal lights transmitted from the subordinate optical networks is carried out in the wavelength division multiplexing manner.
Claims9
An optical network, comprising:
- a plurality of subordinate optical networks, each subordinate optical network comprising at least one optical terminal which transmits and receives signals comprising signal light, wherein multiplexing of transmitted signals and demultiplexing of received signals at said at least one optical terminal is carried out in the subcarrier multiplexing manner;
- and
- a main optical network connected with said subordinate optical networks, wherein multiplexing of signals transmitted from said subordinate optical networks is carried out in the wavelength division multiplexing manner.
An optical network, comprising:
- a plurality of subordinate optical networks, each of which being connected with a plurality of optical terminals which function as a transmitter and a receiver of a signal light, wherein multiplexing of transmission signals and demultiplexing of reception signals at said optical terminals are carried out in the subcarrier multiplexing manner, said optical terminals of number N (N is a natural number of two or more) which are connected with each of said subordinate optical network are cascaded on a optical fiber transmission line;
- and
- a main optical network which is connected with said subordinate optical networks, wherein multiplexing of signal lights transmitted from said subordinate optical networks is carried out in the wavelength division multiplexing manner, wherein carrier signals with frequencies different with each other are input to said optical terminals, an optical receiver in an optical terminal number K (K is a natural number of two or more and N or less) receives a signal light transmitted from a optical terminal number K-1, a carrier signal input to said optical terminal number K and a high-frequency signal output from said optical receiver are multiplexed by an electric multiplexer and a high-frequency signal is then applied to an optical transmitter thereby modulating a signal light transmitted from said optical terminal number K.
An optical network, comprising:
- a plurality of subordinate optical networks, each of which being connected with a plurality of optical terminals which function as a transmitter and a receiver of a signal light, wherein multiplexing of transmission signals and demultiplexing of reception signals at said optical terminals are carried out in the subcarrier multiplexing manner, said optical terminals of number N (N is a natural number of two or more) which are connected with each of said subordinate optical network are cascaded on a optical fiber transmission line which is originated from an optical transmitter;
- and
- a main optical network which is connected with said subordinate optical networks, wherein multiplexing of signal lights transmitted from said subordinate optical networks is carried out in the wavelength division multiplexing manner, wherein each of said optical terminals has an optical modulator in which carrier signals with frequencies different with each other are applied, a signal light transmitted from a first optical terminal is that which is transmitted from said optical transmitter and modulated by said optical modulator, and a signal light transmitted from an optical terminal number K (K is a natural number of two or more and N or less) is that which is transmitted from an optical terminal number K-1 and modulated by said optical modulator.
Dependencies are inferred from the claim text.