LOW-COST WDM SOURCE WITH AN INCOHERENT LIGHT INJECTED FABRY-PEROT LASER DIODE
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Abstract
The present invention discloses a low-cost light source for optical transmission systems and optical networks based on wavelength-division multiplexing (WDM) technology. A light source in accordance with the present invention is implemented by externally injecting a narrow-band incoherent light into a Fabry-Perot laser diode (F-P LD). After injection of narrow-band incoherent light, the output of F-P LD becomes wavelength-selective rather than multi-mode and the output wavelength of F-P LD coincide with the peak wavelength of the injected incoherent light.
Multi-channel WDM light sources according to the present invention can be implemented using a single broadband incoherent light source and plurality of F-P LDs. An optical transmission system for upstream signal transmission in an passive optical network using the light source according the present invention is also disclosed.
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Citations
20 Claims
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1-14. -14. (canceled)
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15. An optical transmission system in a passive optical network, comprising:
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a remote node that includes a first demultiplexer; a central office that includes one or more injection incoherent light sources that generate one or more injection incoherent light signals, a second demultiplexer, and one or more optical receivers that are optically coupled at the output ends of the second demultiplexer; and one or more light sources optically coupled to ports of the first demultiplexer, wherein the first demultiplexer receives output signals from the one or more light sources capable of lasing to generate an upstream signal and a first light source from the one or more light sources receives a first injection light signal to suppress one or more lasing modes outside of a bandwidth of the first injected light signal and to lock an output wavelength of the first light source to within the bandwidth of the first injected light signal;
a first optical fiber to connect the central office with the remote node, wherein the second demultiplexer receives the upstream signal and demultiplexes the upstream signal to the one or more optical receivers; andan optical circulator optically coupled between the first demultiplexer and the second demultiplexer. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification