1 Department of Photonics Engineering, Technical University of Denmark2 Nanophotonic Devices, Department of Photonics Engineering, Technical University of Denmark3 Diode Lasers and LED Systems, Department of Photonics Engineering, Technical University of Denmark4 Fudan University5 University of Bristol6 Fudan University
We propose a novel scheme to expand the inherent limit in the product of the optical delay and the transmission bandwidth in resonator-based delay lines, with the optical orthogonal frequency division multiplexing (OOFDM) technique. The optical group delay properties of a single ring resonator were theoretically studied, and double-carrier OOFDM signals were transmitted through such a device in the experiment, where the subcarrier-frequencies matched those of the resonant modes in the device. The results show that, although the delay-bandwidth product (DBP) is limited in the order of 50 ps×10 Gb/s for signals on each of the sub-carriers, the total DBP of the system is doubled to 2×50 ps×10 Gb/s due to the double-carrier transmission.
Optics Communications, 2013, Vol 305, p. 240-246
Bandwidth; Group delay; Optical resonators; Slow light; Waves; Orthogonal frequency division multiplexing