Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
1999-10-01
2001-07-24
Negash, Kinfe-Michael (Department: 2633)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S199200, C359S199200, C359S199200, C359S341430
Reexamination Certificate
active
06266169
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical transmission method and system for carrying data transmission with the use of optical fiber. More particularly, it concerns an optical transmission method and system preferable in high-speed data transmission over a long distance.
2. Description of the Related Art
Art related to the optical transmission system includes, for example, the technique disclosed in the Japanese Patent Application Laid-Open 3-296334.
However, it is required to accomplish an optical transmission System operating at higher speeds since development of the modern information society has increased long-distance communication traffic in recent years. Also, it is desired that the optical transmission system can transmit data even longer distances without repeaters to increase reliability and decrease cost of the system.
Furthermore, the number of fields to which an optical transmission system is applied has been increased with the recent development of the information society. For this reason, it is needed to achieve an optical transmission system having a variety of functions and the capacities to satisfy various requirements.
SUMMARY OF THE INVENTION
In view of the foregoing, it is an object of the present invention to provide an optical transmission system constructing method capable of easily constructing an optical transmission method and system depending on required functions and capacities.
Briefly, the foregoing object is accomplished in accordance with aspects of the present invention by an optical transmission system. The optical transmission system is characterized by constructing a line terminal having multiplexing means for multiplexing signals and demultiplexing means for demultiplexing the multiplexed signal to serve as a transmitter. The line terminal is selectively capable of implementing either of two types of converters a first combination of an electric-to-optic converter circuit for converting the electric signal multiplexed by the multiplexing means to a transmission light with an optical fiber amplifier for amplifying the transmitting light before feeding into an optical transmission medium; or an electric-to-optic converting means having a semiconductor optical amplifier for converting the electric signal multiplexed by the multiplexing means to a transmission light before feeding an optical transmission line. The optical transmission system also is characterized by constructing the line terminal to serve as a receiver. The line terminal is selectively capable of implementing either; a second combination of an optical fiber amplifier for amplifying a receiving light from an optical transmission medium with an optic-to-electric converter circuit for converting the amplified receiving light to an electric signal before feeding to the demultiplexing means; or an optic-to-electric converting means for converting the received light from the optical transmission medium to an electric signal before feeding to the demultiplexing means with an avalanche photodiode used as a light receiver.
Also, the optical transmission system is characterized in constructing the optical transmission system for use as a long distance optical transmission system; A plurality of the line terminals having the first combination to serve as the transmitter and the second combination to serve as the receiver implemented therein; each are connected to the optical transmission medium through a single or a plurality of repeaters inserted in the optical transmission medium for multiplying the optical light signal on the optical transmission medium.
Further, the optical transmission system is characterized in constructing the optical transmission system for use as a short distance optical transmission system; The plurality of the line terminals having the electric-to-optic converting means having a semiconductor optical amplifier therein to serve as the transmitter and the optic-to-electric converting means having the avalanche photodiode used as the light receiver to serve as the receiver implemented therein; are each directly connected to the optical transmission line.
The optical transmission system constructing method of the present invention enables an easy construction of any of the long-distance and short-distance optical transmission systems only by selecting desired types of transmitters and receivers to be implemented to change the combinations of the units. This is because the line terminal is constructed to serve as the transmitter; The line terminal is selectively capable of implementing either the first combination of an electric-to-optic converter circuit for converting the electric signal multiplexed by the multiplexing means to the transmission light with an optical fiber amplifier for amplifying the transmitting light before feeding into an optical transmission medium or electric-to-optic converting means having the semiconductor optical amplifier for converting the electric signal multiplexed by the multiplexing means to the transmission light before feeding an optical transmission line, and that to serve as the receiver, the line terminal is selectively capable of implementing either the second combination of an optical fiber amplifier for amplifying the receiving light from an optical transmission medium with an optic-to-electric converter circuit for converting the amplified receiving light to electric signal before feeding to the demultiplexing means or an optic-to-electric converting means for converting the received light from the optical transmission medium to electric signal before feeding to the demultiplexing means with an avalanche photodiode used as light receiver.
The foregoing and other objects, advantages, manner of operation and novel features of the present invention will be understood from the Following detailed description when read in connection with the accompanying drawings.
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Aoki Satoshi
Ashi Yoshihiro
Kazawa Toru
Matsuda Hironari
Nakano Hiroyuki
Hitachi , Ltd.
Kenyon & Kenyon
Negash Kinfe-Michael
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