A Wavelength-Tunable Fiber-Coupled Narrow-Band Twin-Photon Source

We present a wavelength-tunable narrow-band fiber-coupled source to generate correlated photon pairs at 539nm and 1550nm. Using a 10-mm PPLN crystal, we obtain more than 50mm tunable range near 1550nm. This source, given its spectral property and tunable property, is well suited for tasks in fiber-optic quantum communication and cryptography networks.