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We proposed the coupling and competition of second harmonic generation (SHG) and acousto-optic (AO) interaction in periodically poled lithium niobate (PPLN). The reciprocal vector of PPLN compensates the SHG wave-vector mismatch when quasi-phase-matching (QPM) condition is satisfied, while phonons with suitable frequencies may affect it by scattering photons to different polarization state. Second...
Polarization independent sum frequency generation (SFG) is proposed in an electro-optic (EO) tunable periodically poled Lithium Niobate (PPLN). The PPLN consists of four sections. External electric field could be selectively applied to them to induce polarization rotation between the ordinary and extraordinary waves. If the domain structure is well designed, the signal wave with an arbitrary polarization...
Periodically poled Lithium Niobate (PPLN) is a promising material for wavelength conversion and switching in an all-optical network. However, current PPLN based network elements are normally polarization sensitive, which is not convenient for telecom applications. We proposed a polarization insensitive frequency conversion approach in a PPLN. The second harmonic generation (SHG) studied as an example...
An approach to improve the coupling efficiency of bidirectional optical sub-assembly (BOSA) modules is proposed and experimentally demonstrated. We analyzed the wave-front aberration coefficients of a typical BOSA. It was found that the 45?? wavelength filter induces coma and astigmatism, and then it further deteriorates the laser diode (LD) to fiber coupling. We measured the BOSA efficiencies based...
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