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Coherent Subcarrier Processing Node Based on Optical Frequency Conversion and Free-Running Lasers
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DOI：10.1109/JLT.2014.2379472.png)
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Abstract
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We demonstrate the use of frequency conversion in optical fiber to implement a coherent add/drop architecture. Its application is experimentally investigated in an optical frequency-division multiplexing scenario with up to three subcarriers which are modulated by quadrature phase-shift keying. We show sub-carrier drop and replacement in a bus topology. Furthermore, we quantify tolerances with respect to delay and amplitude mismatch by experiments and simulations. Finally, we discuss on the scalability of the scheme.
Keywords:
Add-drop multiplexing
coherent detection
fiber nonlinearity
frequency conversion
optical fiber communication
optical frequency-division multiplexing
quadrature amplitude modulation
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