Remote access unit and radio-over-fiber network using same
First Claim
1. A remote access unit (RAU) apparatus coupled to a central station (CS) of an RoF network through at least one optical fiber, comprising:
- a first and second antenna port coupled to at least two antennas;
a first and second optical fiber port coupled to the at least one optical fiber;
a first coupler for decoupling a first downstream signal of a first duplexing method and a second downstream signal of a second duplexing method, which are input through the first optical fiber port;
a circulator for outputting the first downstream signal input from the first coupler to the first antenna port and outputting a first upstream signal of the first duplexing method input from the first antenna port to the second optical fiber port; and
a second coupler for outputting the second downstream signal input from the first coupler to the second antenna port and outputting a second upstream signal of the second duplexing method input from the second antenna port to the second optical fiber port.
1 Assignment
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Accused Products
Abstract
A remote access unit (RAU) apparatus, coupled to a central station (CS) of an RoF network through at least one optical fiber, and which RAU apparatus includes at least one antenna, includes: first and second antenna ports coupled to the at least one antenna; first and second optical fiber ports coupled to the at least one optical fiber; a first coupler for decoupling a first downstream signal of a first duplexing method and a second downstream signal of a second duplexing method, which are input through the first optical fiber port; a circulator for outputting the first downstream signal input from the first coupler to the first antenna port and outputting a first upstream signal of the first duplexing method input from the first antenna port to the second optical fiber port; and a second coupler for outputting the second downstream signal input from the first coupler to the second antenna port and outputting a second upstream signal of the second duplexing method input from the second antenna port to the second optical fiber port.
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Citations
20 Claims
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1. A remote access unit (RAU) apparatus coupled to a central station (CS) of an RoF network through at least one optical fiber, comprising:
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a first and second antenna port coupled to at least two antennas; a first and second optical fiber port coupled to the at least one optical fiber; a first coupler for decoupling a first downstream signal of a first duplexing method and a second downstream signal of a second duplexing method, which are input through the first optical fiber port; a circulator for outputting the first downstream signal input from the first coupler to the first antenna port and outputting a first upstream signal of the first duplexing method input from the first antenna port to the second optical fiber port; and a second coupler for outputting the second downstream signal input from the first coupler to the second antenna port and outputting a second upstream signal of the second duplexing method input from the second antenna port to the second optical fiber port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radio-over-fiber (RoF) network comprising:
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a central station (CS) for transmitting a first downstream signal of a first duplexing method and a second downstream signal of a second duplexing method and said CS receiving a first upstream signal of the first duplexing method and said CS receiving a second upstream signal of the second duplexing method; and a remote access unit (RAU) coupled to the CS through at least one optical fiber and said RAU having at least two antennas, wherein, the RAU comprises; first and second ports to the least one antenna; first and second optical fiber ports coupled to the at least one optical fiber; a first coupler for decoupling the first downstream signal and the second downstream signal, which first downstream signal and second downstream signal are input through the first optical fiber port; a circulator for outputting the first downstream signal input from the first coupler to the first antenna port and said circulator for outputting the first upstream signal input from the first antenna port to the second optical fiber port; and a second coupler for outputting the second downstream signal input from the first coupler to the second antenna port and said second coupler for outputting the second upstream signal input from the second antenna port to the second optical fiber port. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A remote access unit (RAU) apparatus coupled to a central station (CS) of an RoF network through at least one optical fiber comprising:
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first and second antenna ports coupled to at least two antennas; first and second optical fiber ports coupled to the at least one optical fiber; a first duplexer for separating a first downstream signal of a first duplexing method and a second downstream signal of a second duplexing method, which are input through the first optical fiber port; a circulator for outputting the first downstream signal input from the first duplexer to the first antenna port and outputting a first upstream signal of the first duplexing method input from the first antenna port to the second optical fiber port; and a second duplexer for outputting the second downstream signal input from the first duplexer to the second antenna port and outputting a second upstream signal of the second duplexing method input from the second antenna port to the second optical fiber port, wherein, the first duplexing method is a time division duplexing (TDD) method and different time slots are assigned to the first downstream and upstream signals. - View Dependent Claims (18, 19, 20)
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Specification