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Published May 2018 | public
Journal Article

An Ultrafast Wideband Discretely Swept Fiber Laser

Abstract

The wavelength sweeping technology has gained its popularity in various research areas for the high resolution and high throughput capabilities. Illuminating with continuously wavelength-swept spectra, traditional spectrally encoded optical systems show low detection sensitivities in either time or spectral domains, due to the optical power divergence. In addition, they can also deliver a nontrivial sampling rate when fast line scan is performed, easily go beyond 50 GS/s, which overwhelms the conventional data processing system. In this paper, we demonstrate a 15-MHz discretely swept source at a bandwidth of ~70 nm particularly for high-speed spectrally encoded applications. The wideband discretely swept laser exhibits higher peak power, which enhances the detection sensitivity of optical system by more than 3 dB. The discretely sweeping characterization of the proposed laser is also proved to have the potential of reducing the data stream for fast processing without compromising the line-scan rate. It is believed that the efforts made in this paper provide a promising resolution for in situ ultrafast optical diagnosis at a higher sensitivity.

Additional Information

© 2017 IEEE. Manuscript received May 4, 2017; revised August 1, 2017; accepted September 9, 2017. Date of publication September 15, 2017; date of current version October 3, 2017. This work was supported in part by the Research Grants Council of the Hong Kong Special Administrative Region, China, under Projects HKU 17205215, HKU 17208414, and CityU T42-103/16-N, in part by the National Natural Science Foundation of China (N_HKU712/16), in part by the Innovation and Technology Fund (GHP/050/14GD), and in part by the University Development Fund of HKU.

Additional details

Created:
August 19, 2023
Modified:
October 17, 2023