PROJECT TITLE :
Electrically Programmable All-Fiber Structured Second Order Optical Temporal Differentiator
We propose and experimentally demonstrate an electrically programmable second order optical temporal differentiator (OTD) based on linearly chirped fiber Bragg grating (LCFBG) and digital thermal print head (TPH). For the high-speed optical signal with twenty five-GHz repetition rate, an efficient second-order OTD has been achieved for arbitrary wavelength and bandwidth with the software-defined TPH configurations. By optimizing the thermooptic effect induced optical phase modification within the LCFBG, the central wavelength of the differentiator will be reconfigured flexibly from 1543.five to 1561.7 nm, with a step size of zero.114 nm. By dynamically controlling the heating parts bonded with the LCFBG, optical pulses with zero.55- and zero.eight-nm 3-dB bandwidths have been successfully processed with acceptable deviation compared with the theoretical calculations.
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