Abstract
A novel frequency quasi-linear swept light source based on multi-frequency time-matched spectrum stitching and recirculating frequency shifter loop (RFSL) is proposed and successfully demonstrated. The seed light with different frequencies enters RFSL in turn through optical delay line to complete the frequency sweep and spectrum stitching of each band. Spectrum stitching can effectively reset the noise, suppress the accumulation of amplified spontaneous emission (ASE) noise and the spectral sideband noise in RFSL, and expand the sweep range several times without affecting the sweep linearity. A swept range of 5.227 nm is experimentally achieved with the noise range of 7.78 dB. Compared with the single-frequency sweep scheme that the noise variation is 9.03 dB, the sweep range is extended by more than three times. The Pearson's correlation coefficients (r) of the output swept signal is higher than −0.99996.
Highlights
A novel frequency quasi-linear swept light source based on multi-frequency timematched spectrum stitching and recirculating frequency shifter loop (RFSL) is proposed and successfully demonstrated
Frequency swept light sources that establishes the mapping relationship between the frequency domain and the time domain through emitting different wavelengths at different times have been extensively used in the field of optical coherence tomography (OCT) [1], fiber sensor [2], lidar [3], absolute distance measurement [4], optical serial coherent analyzer (OSCAR) [5], multiplefrequency measurement [6], etc
We experimentally demonstrate that the stitching in both time domain and frequency domain are realized simultaneously and the swept signal outputs from a single port of 5.227 nm swept range is achieved within 7.78 dB noise variation, which is a significant improvement compare with single-frequency sweep scheme
Summary
Frequency swept light sources that establishes the mapping relationship between the frequency domain and the time domain through emitting different wavelengths at different times have been extensively used in the field of optical coherence tomography (OCT) [1], fiber sensor [2], lidar [3], absolute distance measurement [4], optical serial coherent analyzer (OSCAR) [5], multiplefrequency measurement [6], etc All of these applications require the high resolution and low signal processing overhead, which can be fulfilled by a broadband swept laser source with low noise and high linearity in k-space. The spectrum stitching dose not affect the k-linearity of the swept output and the Pearson’s correlation coefficients (r) is better than −0.99996
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