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.
100 Citations
22 Claims
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1-14. -14. (canceled)
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15. A multi-channel WDM light source comprising:
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an incoherent light source that generates a broadband incoherent light; an optical circulator coupled to the incoherent light source; a demultiplexer coupled to the optical circulator, wherein the optical circulator is configured to route the broadband incoherent light to the demultiplexer and to separate an output of the demultiplexer from the broadband incoherent light, wherein the demultiplexer is configured to receive the broadband incoherent light, to slice spectrally the broadband incoherent light to produce a plurality of narrow-band incoherent lights; and a plurality of light sources capable of lasing that are connected at output ends of the demultiplexer, wherein the demultiplexer is further configured to multiplex outputs of the plurality of light sources capable of lasing, wherein at least one of the plurality of light sources capable of lasing is configured to emit a wavelength-selective output locked by one of the narrow-band incoherent lights, wherein the at least one of the plurality of light sources capable of lasing is configured to be modulated directly. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification