G. Schreiber

Nonlinear integrated optical frequency converters with periodically poled Ti:LiNbO3 waveguides

The development of a whole family of near and mid-IR quasi- phase matched parametric frequency converters with periodically poled in Ti:(Er:)LiNbO3 waveguides is reviewed. Due to high quality waveguides with very low losses and excellent homogeneity unprecedented conversion efficiencies have been achieved for second-harmonic generation, difference-frequency generation, optical parametric fluorescence and doubly as well as singly resonant optical parametric oscillation.

Quasi-phase-matched difference-frequency generation in periodically poled Ti:LiNbO 3 channel waveguides

Mid-infrared radiation near 2.8 mum was generated by difference-frequency generation in an 80-mm-long periodically poled Ti:LiNbO(3) channel waveguide by pump radiation near 1.55 mum (tunable external-cavity laser) and a signal radiation of 3.391 mum (HeNe laser). We obtained a normalized conversion efficiency of 105% W(-1) , which is to our knowledge the highest value ever reported.

Waveguide-based OPO source of entangled photon pairs

In this paper, we present a compact source of narrow-band energy–time-entangled photon pairs in the telecom regime based on a Ti-indiffused periodically poled lithium niobate (PPLN) waveguide resonator, i.e. a waveguide with end-face dielectric multi-layer mirrors. This is a monolithic doubly resonant optical parametric oscillator (OPO) far below threshold, which generates photon pairs by spontaneous parametric down-conversion (SPDC) at around 1560 nm with a 117 MHz (0.91 pm)-bandwidth. A coherence time of 2.7 ns is estimated by a time correlation measurement and a high quality of the entangled states is confirmed by a Bell-type experiment. Since highly coherent energy–time-entangled photon pairs in the telecom regime are suitable for long distance transmission and manipulation, this source is well suited to the requirements of quantum communication.

One-dimensional spatial soliton families in optimally engineered quasi-phase-matched lithium niobate waveguides

The advantage for quadratic soliton generation of engineering the quasi-phase-matching period near the input of lithium niobate slab waveguides is demonstrated. This approach allows members of one-dimensional quadratic soliton families with different values of the wave-vector mismatch to be cleanly excited and to be characterized by quantitative intensity-profile measurements of both the fundamental and the second-harmonic soliton components.

Efficient Ti:PPLN multi-wavelength converter for high bitrate WDM-transmission systems

Wavelength conversion by cascaded difference frequency generation (cDFG) in a fully packaged Ti:PPLN (periodically poled lithium niobate) waveguide converter with an efficiency of -8 dB up to -3 dBm of converted output and simultaneous multichannel conversion without depletion has been demonstrated. A converted 40 Gbit/s RZ-channel has been transmitted error-free over 5/spl times/100 km of NZDSF (non-zero dispersion shifted fibre) without penalty.

Integrated optical parametric oscillators with Ti:PPLN waveguides

The state of the art of integrated optical parametric oscillators with Ti-indiffused waveguides in periodically poled lithium niobate (PPLN) is reviewed with emphasis on devices for the mid infrared spectral range (2700 nm</spl lambda//sub s.i/<3500 nm).

Wavelength Conversion, Optical Parametric Amplification and Oscillation in Periodically Poled Ti:LiNbO3 Optical Waveguides

Quasi-phase matched quadratic nonlinear waveguide devices in periodically poled lithium niobate (PPLN) are reviewed with emphasis on Ti:(Er:) PPLN structures. In particular, difference frequency generators, optical parametric amplifiers and oscillators and combinations of lasers and nonlinear frequency converters are presented.

Nonlinear beam dynamics in chi2 waveguides

The evolution from diffraction, to single and then multiple quadratic soliton generation, and finally the onset of modulational instability were observed for wide fundamental beams in both birefringence and quasi-phase matched LiNbO3 slab waveguides.

Doubly resonant near-infrared optical parametric oscillator with periodically poled Ti:LiNbO/sub 3/ waveguide

Summary form only given. Integrated optical parametric oscillators (IOPOs) are attractive devices to generate tunable coherent radiation in a broad tuning range. Contrary to their bulk counterparts IOPOs promise a low oscillation threshold, low waveguide losses provided. Using the same technology we report in this contribution the first, to our knowledge, cw near-infrared IOPO with periodically poled Ti:LiNbO/sub 3/ waveguide.

Parametric Mid-Infrared Generation in Periodically Poled Ti:LiNbO3 Waveguides

Integrated optical parametric devices in LiNbO3 have been identified as most attractive tunable nonlinear frequency converters [1] with many applications mainly in environmental sensing and process monitoring. Using periodically poled waveguides and exploiting quasi-phase matching devices of high efficiency can be developed even for mid-infrared- (MIR-) operation allowing optical pumping with diode lasers.