Abstract
Frequency conversion using highly non-degenerate four-wave mixing is investigated in optically injection-locked InAs/GaAs quantum-dot Fabry-Perot lasers with different ridge waveguide dimensions. Conversion efficiencies up to -16 dB with a large optical signal-to-noise ratios of 36 dB are unveiled. The conversion bandwidth is extended to 4 THz with a quasi-symmetrical response between up- and down-converted signals.
Highlights
Four-wave mixing (FWM) is a decisive technique that has been widely used in wavelengthdivision multiplexing systems, in particular for wavelength conversion, negative frequency chirping and fiber wavelength dispersion compensation.[1,2] With the recent emergence of commercial coherent systems, FWM can be envisioned to develop novel types of wavelength converters for any advanced modulation formats,[3,4] as well as for all-optical signal processing[5] in future photonic integrated circuits (PICs).[6]
The use of highly nonlinear optical fibers allows very efficient conversion, it usually requires an interaction length of several meters and a large pump power, which are not suitable for monolithic integration. Another important issue with optical fibers is that the required fiber length combined with an operation away from the zero-dispersion wavelength strongly affects the wave mixing and can alter conversion efficiency
Injection-locking can allow faster modulation of the converted signals as already reported for InGaAs/InP DFB QW lasers[25] and was recently used with InAs/InP FP lasers both made with different types of nanomaterials.[26,27]
Summary
Four-wave mixing (FWM) is a decisive technique that has been widely used in wavelengthdivision multiplexing systems, in particular for wavelength conversion, negative frequency chirping and fiber wavelength dispersion compensation.[1,2] With the recent emergence of commercial coherent systems, FWM can be envisioned to develop novel types of wavelength converters for any advanced modulation formats,[3,4] as well as for all-optical signal processing[5] in future photonic integrated circuits (PICs).[6]. Efficiency of four-wave mixing in injectionlocked InAs/GaAs quantum-dot lasers
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