Communication system using optical fibers
First Claim
1. A communication system using optical fibers, said communication system comprising:
- down- and up-link optical fibers;
N radio access units, each of which has antenna means connected to said down- and up-link optical fibers, converts a down-link optical signal received from said down-link optical fiber to a down-link RF signal and sends said down-link RF signal by said antenna means, and converts an up-link RF signal received by said antenna means to an up-link optical signal and sends said up-link optical signal to said up-link optical fiber, said N being an integer equal to or greater than 1; and
a divider/combiner unit which;
has a plurality of input/output terminals;
forms first and second communication systems corresponding to said plurality of input/output terminals, together with said down- and up-link optical fibers and said N radio access units connected to said down- and up-link optical fibers, respectively;
converts a down-link RF signal input to each of said input/output terminals into an optical signal, and sends the converted optical signal as said down-link optical signal via said down-link optical fiber to those of said radio access units corresponding said first and second communication systems; and
converts said up-link optical signal, sent over said up-link optical fiber from said radio access units corresponding to said first and second communication systems, into an up-link RF signal, and providing said up-link RF signal input to each of said input/output terminal corresponding said first and second communication systems
1 Assignment
0 Petitions
Accused Products
Abstract
A divider/combiner unit combines RF signals, then converts the combined signal into an optical signal and sends it over an optical fiber. N radio access units each convert the optical signal received from the optical fiber into an RF signal and transmits it from an antenna, and each radio access unit converts an RF signal received by the antenna into an optical signal and sends it over an optical fiber to the divider/combiner unit. The divider/combiner unit converts the received optical signal into RF signals and outputs them. This system is operated as plurality of communication systems in common to them in correspondence to a plurality of input/output terminals of the divider/combiner unit.
156 Citations
26 Claims
-
1. A communication system using optical fibers, said communication system comprising:
-
down- and up-link optical fibers;
N radio access units, each of which has antenna means connected to said down- and up-link optical fibers, converts a down-link optical signal received from said down-link optical fiber to a down-link RF signal and sends said down-link RF signal by said antenna means, and converts an up-link RF signal received by said antenna means to an up-link optical signal and sends said up-link optical signal to said up-link optical fiber, said N being an integer equal to or greater than 1; and
a divider/combiner unit which;
has a plurality of input/output terminals;
forms first and second communication systems corresponding to said plurality of input/output terminals, together with said down- and up-link optical fibers and said N radio access units connected to said down- and up-link optical fibers, respectively;
converts a down-link RF signal input to each of said input/output terminals into an optical signal, and sends the converted optical signal as said down-link optical signal via said down-link optical fiber to those of said radio access units corresponding said first and second communication systems; and
converts said up-link optical signal, sent over said up-link optical fiber from said radio access units corresponding to said first and second communication systems, into an up-link RF signal, and providing said up-link RF signal input to each of said input/output terminal corresponding said first and second communication systems - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26)
-
Specification