ROF link apparatus for selecting IF band to process service signals through MMF and method for selecting IF band
First Claim
1. A Radio over Fiber (ROF) link apparatus for selecting an Intermediate Frequency (IF) band in order to process various service signals through a Multi-mode Fiber (MMF), the ROF link apparatus comprising:
- a plurality of transmitters for receiving the various service signals for performing IF modulation for the various service signals, and transferring the modulated IF signals;
a first controller containing information regarding frequency bands of substantially flat amplitude in the amplitude/frequency characteristics of the MMF, and transferring information regarding the frequency bands of substantially flat amplitude to the transmitters for controlling IF modulation;
a link unit for combining the IF signals modulated by the transmitters with output signals of the first controller, converting the combined signals into optical signals, transmitting the optical signals, converting the optical signals into electrical signals, and splitting the electrical signals;
a second controller for receiving the output signals of the first controller, detecting information on IF modulation frequencies of the transmitters and transferring the detected information to a plurality of receivers, thereby controlling demodulation to be performed in the substantially flat amplitude frequency bands; and
the receivers for receiving the IF modulated signals, which have been split through the link unit, receiving the information on the IF modulation frequencies from the second controller, and performing demodulation in the flat frequency bands by means of the received information.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed is an ROF link apparatus for selecting an IF band in order to process various service signals through an MMF, which including transmitters for receiving the service signals, performing IF modulation for the service signals, and transferring the modulated IF signals, a first controller for scanning frequency characteristics of the MMF, searching for flat frequency bands, and transferring information regarding the flat frequency band, thereby controlling IF modulation to be performed, a link unit for combining the IF signals with output signals of the first controller, converting the combined signals into optical signals, transmitting the optical signals, converting the optical signals into electrical signals, and splitting the electrical signals, a second controller for receiving the output signals of the first controller, detecting information regarding the flat frequency band, and transferring the information to receivers, thereby controlling modulation to be performed, and the receivers for receiving the IF modulated signals, receiving the information from the second controller, and performing RF modulation.
6 Citations
17 Claims
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1. A Radio over Fiber (ROF) link apparatus for selecting an Intermediate Frequency (IF) band in order to process various service signals through a Multi-mode Fiber (MMF), the ROF link apparatus comprising:
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a plurality of transmitters for receiving the various service signals for performing IF modulation for the various service signals, and transferring the modulated IF signals;
a first controller containing information regarding frequency bands of substantially flat amplitude in the amplitude/frequency characteristics of the MMF, and transferring information regarding the frequency bands of substantially flat amplitude to the transmitters for controlling IF modulation;
a link unit for combining the IF signals modulated by the transmitters with output signals of the first controller, converting the combined signals into optical signals, transmitting the optical signals, converting the optical signals into electrical signals, and splitting the electrical signals;
a second controller for receiving the output signals of the first controller, detecting information on IF modulation frequencies of the transmitters and transferring the detected information to a plurality of receivers, thereby controlling demodulation to be performed in the substantially flat amplitude frequency bands; and
the receivers for receiving the IF modulated signals, which have been split through the link unit, receiving the information on the IF modulation frequencies from the second controller, and performing demodulation in the flat frequency bands by means of the received information. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10)
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7. A method for selecting an Intermediate Frequency (IF) band in a Radio over Fiber (ROF) link apparatus for selecting the IF band in order to process various service signals through a Multi-mode Fiber (MMF), the method comprising the steps of:
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scanning an amplitude characteristics of signals in frequency bands except for a 3 dB band of the MMF;
detecting flat amplitude bands of more than a predetermined frequency size from the scanned characteristics;
assigning signals to be transmitted through the flat bands detected; and
transmitting IF modulated signals through the 3 dB band and the detected flat bands. - View Dependent Claims (8)
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11. A Radio over Fiber (ROF) link apparatus for selecting an Intermediate Frequency (IF) band in order to process plurality of service signals through a Multi-mode Fiber (MMF), the ROF link apparatus comprising:
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a plurality of transmitters, receiving selected ones of the plurality of service signals, each transmitter performing IF modulation for the corresponding service signals, and transferring the modulated IF signals, a first controller containing information regarding frequency bands of substantially flat amplitude in the amplitude/frequency characteristics of the MMF, and transferring information regarding the frequency bands of substantially flat amplitude to the transmitters for controlling IF modulation; and
a link unit for combining the IF signals with output signals of the first controller. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification