Optical access network using wavelength-locked WDM optical source injected by incoherent light
First Claim
1. A passive optical network, comprising:
- a broadband light source in a central office to provide broadband incoherent light;
a multiplexer connected to the central office via an optical fiber for filtering the light transmitted from the broadband light source according to wavelengths and multiplexing upstream signals to provide a first plurality of wavelengths;
at least one splitter coupled to the multiplexer for branching a wavelength of the first plurality of wavelengths and combining the upstream optical signals; and
a plurality of wavelength-locked Fabry-Perot laser diodes connected to the at least one splitter to share the branched wavelength that is injected through the splitter to determine an oscillation wavelength of the plurality of wavelength-locked Fabry-Perot laser diodes, the wavelength-locked Fabry-Perot laser diodes capable of performing direct and analog modulation, and a control unit to directly modulate lights of the Fabry-Perot laser diodes and transmitting modulated lights to subscribers using time division multiplexing.
1 Assignment
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Accused Products
Abstract
The present invention relates to a passive optical network, which inexpensively improves the spectral efficiency of an access network and is capable of increasing the number of subscribers per channel by using WDM in combination with Time Division Multiplexing (TDM) or SubCarrier Multiple Access (SCMA) to expand a conventional WDM passive optical network. The passive optical network includes light providing means provided in a central office to provide broadband incoherent light; a multiplexer connected to the central office via an optical fiber to divide the light transmitted from the light providing means according to wavelengths and to multiplex upstream signals; a plurality of splitters to branch divided lights and to combine the upstream optical signals; and a plurality of subscribers connected to the splitters, the subscribers including wavelength-locked Fabry-Perot laser diodes capable of performing direct and analog modulation, and means for directly modulating lights of the Fabry-Perot laser diodes and transmitting modulated lights to the subscribers using time division multiplexing.
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Citations
20 Claims
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1. A passive optical network, comprising:
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a broadband light source in a central office to provide broadband incoherent light; a multiplexer connected to the central office via an optical fiber for filtering the light transmitted from the broadband light source according to wavelengths and multiplexing upstream signals to provide a first plurality of wavelengths; at least one splitter coupled to the multiplexer for branching a wavelength of the first plurality of wavelengths and combining the upstream optical signals; and a plurality of wavelength-locked Fabry-Perot laser diodes connected to the at least one splitter to share the branched wavelength that is injected through the splitter to determine an oscillation wavelength of the plurality of wavelength-locked Fabry-Perot laser diodes, the wavelength-locked Fabry-Perot laser diodes capable of performing direct and analog modulation, and a control unit to directly modulate lights of the Fabry-Perot laser diodes and transmitting modulated lights to subscribers using time division multiplexing. - View Dependent Claims (2, 3, 4)
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5. A passive optical network, comprising:
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a broadband light source in a central office to provide broadband incoherent light; a multiplexer connected to the central office via an optical fiber for dividing the light transmitted from the broadband light source according to wavelengths to provide a first plurality of lights and to multiplexing upstream signals; at least one splitter coupled to the multiplexer for branching a wavelength of the first plurality of lights and combining the upstream optical signals; and a plurality of wavelength-locked Fabry-Perot laser diodes connected to the at least one splitter to share the branched wavelength that injected through the splitter to determine an oscillation wavelength of the plurality of wavelength-locked Fabry-Perot laser diodes, the wavelength-locked Fabry-Perot laser diodes capable of performing direct and analog modulation, and a control unit to directly modulate the Fabry-Perot laser diodes using subcarrier modulation and transmitting the modulated lights to subscribers. - View Dependent Claims (6, 7, 8)
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9. A method, comprising:
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supplying broadband light; filtering the broadband light transmitted according to wavelengths to provide a first plurality of wavelengths; injecting, through the splitter, a filtered wavelength of the first plurality of wavelengths into a plurality of wavelength-locked Fabry-Perot laser diodes, to provide output lights, so that the injected wavelength that is shared between the plurality of wavelength-locked Fabry-Perot laser diodes through the splitter determines an oscillation wavelength of the plurality of wavelength-locked Fabry-Perot laser diodes; and modulating the output lights of the Fabry-Perot laser diodes. - View Dependent Claims (10, 11, 12, 13)
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14. An apparatus, comprising:
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a broadband light source to provide broadband light; a multiplexer for filtering broadband light according to wavelengths to provide a first plurality of wavelengths; a splitter coupled to the multiplexer to branch a wavelength of the first plurality of wavelengths; and a plurality of wavelength-locked Fabry-Perot laser diodes connected to the splitter to share the branched wavelength that is injected through the splitter to determine an oscillation wavelength of the plurality of wavelength-locked Fabry-Perot laser diodes. - View Dependent Claims (15, 16, 17, 18)
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19. A system, comprising:
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means for supplying broadband light; means for filtering the broadband light according to wavelengths to provide a first plurality of wavelengths; means for injecting, through the splitter, a filtered wavelength of the first plurality of wavelengths into a plurality of wavelength-locked Fabry-Perot laser diodes to provide output lights, so that the injected wavelength that is shared between the plurality of wavelength-locked Fabry-Perot laser diodes through the splitter determines an oscillation wavelength of the output lights; and means for modulating the output lights of the Fabry-Perot laser diodes. - View Dependent Claims (20)
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Specification