Proc. SPIE. 5624, Semiconductor and Organic Optoelectronic Materials and Devices
KEYWORDS: Second-harmonic generation, Waveguides, Signal attenuation, Photons, Wave propagation, Telecommunications, Signal processing, Data conversion, Sum-frequency generation, Difference frequency generation
A novel scheme of all optical wavelength converter is introduced, in which double-pass configuration based on sum- and difference-frequency generation (SFG+DFG) is proposed for the first time. A concept named "balance condition" is presented to arrange the powers and wavelengths of the two pump sources. Under this condition, the process of SFG is irreversible. Thus, the two pump sources can be utilized completely and the sum-frequency wave can be generated with high power. The efficiency of the system is therefore enhanced. The theoretical expression of the output power of the converted wave and signal are derived when loss is not taken into accounts. In addition, the concept of "Maximum Length" of the waveguide is introduced to avoid the output converted power being reduced due to its oscillating behavior. Finally, the "Maximum Length" is investigated by numerical calculations.