An Anti-Symmetric-Sample Grating Structure for Improving the Reconstruction-Equivalent-Chirp Technology

This letter presents a novel sampled grating structure for improving reconstruction-equivalent-chirp (REC) technology. The proposed structure has uniform seed grating but with the anti-symmetric-sample structure. It has been found that in such a structure, the wavelengths of the ±1st channels can be both blue-shifted more than 40 nm, but the wavelength of the 0th channel is not changed. When the +1st channel is used as the working channel, the wavelength spacing between the +1st channel and the 0th channel is increased by more than 40 nm. Such a phenomenon will be sure to increase the performance and working bandwidth of the REC-based components such as the REC-based distributed-feedback (DFB) laser/laser array.