Ultrafast Wavenumber Linear-Step-Swept Source Based on Synchronous Lightwave Synthesized Frequency Sweeper

Abstract

An ultrafast wavenumber linear-step-swept source based on a synchronous lightwave synthesized frequency sweeper (SLSFS) is demonstrated. A multi-wavelength source is used as a seed source. In SLSFS, the swept range of different wavelength components is precisely controlled by a stable programmable radio frequency signal applied on a dualparallel Mach-Zehnder modulator instead of a conventional wavelength filter. The identical frequency shifting step of all the wavelength components promises high linear sweeping in the frequency domain. The key significance of this technique is that the swept rate and the swept range increases as the number of the seed wavelengths increases. Experimentally, a 120 kHz swept rate over the 4.75 nm range with a 8.6 GHz swept step is achieved when using two coupled DFB-LDs as the seed source. The K-linearity of Pearson's correlation coefficients is 0.99999. We also acquired the swept rates of 400 kHz, 800 kHz, and 1.23 MHz over the 7.86 nm range with a 8.6 GHz swept step using an F-P LD as a seed source.

Effects of different interpolation methods on imaging quality of (SS-OCT) system

“…Various solutions have been developed to overcome this issue. Solutions on hardware include linearwavenumber spectrometers for spectral domain OCT (SD-OCT) [3][4][5][6] and an external k-trigger used for swept-source OCT (SS-OCT) system [7][8][9][10][11] . On one hand these devices require a strict and regular calibration, on the other hand, additional hardware devices undoubtedly increase the cost of the SS-OCT system.…”

Optical Interferometric Fringe Pattern-Incorporated Spectrum Calibration Technique for Enhanced Sensitivity of Spectral Domain Optical Coherence Tomography

“…Spectral calibration methods have, therefore, always been a primary concern. Numerous approaches were demonstrated by using complex numerical data resampling methods and using bulky optical hardware methods due to unavailability of supremely well-designed spectrometers [25][26][27][28][29].…”

Frequency Quasi-Linear Swept Light Source Based on Multi-Frequency Time-Matched Spectrum Stitching

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