System and method for interoperating a radio-over-fiber based network in a fiber-to-the-home network
First Claim
1. A system for communication between a radio-over-fiber based network and a fiber-to-the-home network, comprising:
- a central station; and
a base station connected to the central station by an optical link;
the central station including;
a laser diode configured for generating a laser optical signal;
a first optical circulator coupled to the laser diode and configured to circulate the laser optical signal and a downlink optical signal received by the central station;
an optical carrier generating unit coupled to the first optical circulator and configured to generate an optical carrier for each of the optical signals; and
a second optical circulator coupled to the optical carrier generating unit and configured to circulate the optical signals and/or the optical carrier for transmission through the optical link;
the base station including;
a third optical circulator optically connected to the optical link; and
a band pass filter coupled to the third optical circulator and configured to select and pass the laser optical signal, wherein the unselected signal is the downlink optical signal.
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Accused Products
Abstract
The present invention relates to a system for interoperating a full-duplex radio-over-fiber (RoF) network in a fiber-to-the-home (FTTH) network and to a method associated with the system. The system comprises, at the central station (100), a laser diode (105a), a first optical circulator (105b), an optical carrier generating unit (105c), and a second optical circulator (105d). The system comprises, at a base station (101), a third optical circulator (101a) a band pass filter (101b) coupled to the third optical circulator (101a) and configured to select only the optical signal having a corresponding pass band in which is used for converting an uplink signal as a remote local oscillator signal. The unselected optical signal is transmitted as downlink data.
38 Citations
19 Claims
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1. A system for communication between a radio-over-fiber based network and a fiber-to-the-home network, comprising:
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a central station; and a base station connected to the central station by an optical link; the central station including; a laser diode configured for generating a laser optical signal; a first optical circulator coupled to the laser diode and configured to circulate the laser optical signal and a downlink optical signal received by the central station; an optical carrier generating unit coupled to the first optical circulator and configured to generate an optical carrier for each of the optical signals; and a second optical circulator coupled to the optical carrier generating unit and configured to circulate the optical signals and/or the optical carrier for transmission through the optical link; the base station including; a third optical circulator optically connected to the optical link; and a band pass filter coupled to the third optical circulator and configured to select and pass the laser optical signal, wherein the unselected signal is the downlink optical signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. The method of operating a radio-over-fiber based network in a fiber-to-the-home network, the method comprising:
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receiving, at an optical circulator of a central station from an optical line terminal of the central station, a downlink optical signal; providing, at the central station, a laser optical signal at a wavelength different than that of the downlink optical signal; generating, by an optical carrier generating unit of the central station, an optical carrier for each of the optical signals; receiving, at a base station from the central station via an optical link, the optical carriers and the optical signals consisting of the laser optical signal and the downlink optical signal; converting, at the base station, an uplink signal to an intermediate frequency using the laser optical signal; and transmitting, at the base station, the downlink optical signal. - View Dependent Claims (16, 17, 18, 19)
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Specification