Tunable linear-step-swept light source based on time-delayed spectrum stitching technique

We present a step-swept light source with high linearity and tunable frequency step based on the lightwave synthesized frequency sweeper (LSFS). Different from the traditional internal modulation, this light source can effectively avoid complex frequency-calibration and deduce the spectrum stitching error by using the external modulation and a time delayed spectrum stitching technique. Experimentally, a k-space swept with > -0.99997 swept linearity is achieved. The swept range are 5.135 nm with 10 GHz swept step and 3.902 nm with 7.5 GHz swept step. The spectrum stitching-error is less than 2.92% and 0.65% respectively.

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