Phase-shifted distributed feedback laser with linearly chirped grating fabricated by reconstruction equivalent chirp technique

• We demonstrate for the first time the phase-shifted DFB laser with linearly chirped grating.
• We use reconstructive equivalent chirp (REC) technique to design the grating.
• We compare and analyze the measured results and the simulated results.
• The spectra from the two AR/AR coated facets are different due to the grating chirp.
• REC technique is a simple method to realize chirped gratings with low cost and high flexibility.

The phase-shifted distributed feedback (DFB) semiconductor laser with linearly chirped grating based on reconstruction equivalent chirp (REC) technique is theoretically analyzed and experimentally demonstrated for the first time. The asymmetric property of the lasing spectrum is analyzed according to the normalized threshold gain, and the different spectra from each facet of the laser are compared. Due to the low cost and fabrication flexibility, REC technique provides a promising way for the future practical applications of DFB lasers with chirped gratings.