Expansion of VCSEL-Based Optical Frequency Combs in the Sub-THz Span: Comparison of Non-Linear Techniques

Prior, E.; Dios, Cristina de; Criado, Á. R.; Ortsiefer, M.; Meißner, P.; Acedo, Pablo

doi:10.1109/jlt.2016.2594129

Cited by 16 publications

(7 citation statements)

References 29 publications

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“…The implementation of comb generators with several stages could lead to expand the attainable optical bandwidth or, alternatively, to densify the generated spectra [45,46]. The number of comb lines could be also incremented by spectral broadening in highly nonlinear fibers [12,47]. On the other hand, increasing the frequency resolution while keeping a high measurement speed could be accomplished by using two combs with dissimilar line spacing [48].…”

Section: Resultsmentioning

confidence: 99%

Gain-switched semiconductor lasers with pulsed excitation and optical injection for dual-comb spectroscopy

et al. 2020

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In this work we demonstrate the capability of two gain-switched optically injected semiconductor lasers to perform high-resolution dual-comb spectroscopy. The use of low duty cycle pulse trains to gain switch the lasers, combined with optical injection, allows us to obtain flat-topped optical frequency combs with 350 optical lines (within 10 dB) spaced by 100 MHz. These frequency combs significantly improve the spectral resolution reported so far on dual-comb spectroscopy with gain-switched laser diodes. We evaluate the performance of our system by measuring the transmission profile of an absorption line of H 13 CN at the C-band, analyzing the attainable signal-to-noise ratio for a range of averaging times.

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Section: Resultsmentioning

confidence: 99%

Gain-switched semiconductor lasers with pulsed excitation and optical injection for dual-comb spectroscopy

et al. 2020

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“…This can be done if a broad DOFC is generated for covering the optical spectrum of a FBG serial array. Currently, there is increasing interest in the expansion of OFCs for applications in several fields, and great research efforts are being focused on the generation of broader OFCs [14,15,16]. State-of-the-art electro-optical DOFCs are able to generate a broadband OFC of 40 nm [17].…”

Section: Dual-optical Frequency Comb-based Fbg Interrogation Systemmentioning

confidence: 99%

Fast Interrogation of Fiber Bragg Gratings with Electro-Optical Dual Optical Frequency Combs

Posada-Román

García-Souto

Poiana

et al. 2016

Sensors

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Optical frequency combs (OFC) generated by electro-optic modulation of continuous-wave lasers provide broadband coherent sources with high power per line and independent control of line spacing and the number of lines. In addition to their application in spectroscopy, they offer flexible and optimized sources for the interrogation of other sensors based on wavelength change or wavelength filtering, such as fiber Bragg grating (FBG) sensors. In this paper, a dual-OFC FBG interrogation system based on a single laser and two optical-phase modulators is presented. This architecture allows for the configuration of multimode optical source parameters such as the number of modes and their position within the reflected spectrum of the FBG. A direct read-out is obtained by mapping the optical spectrum onto the radio-frequency spectrum output of the dual-comb. This interrogation scheme is proposed for measuring fast phenomena such as vibrations and ultrasounds. Results are presented for dual-comb operation under optimized control. The optical modes are mapped onto detectable tones that are multiples of 0.5 MHz around a center radiofrequency tone (40 MHz). Measurements of ultrasounds (40 kHz and 120 kHz) are demonstrated with this sensing system. Ultrasounds induce dynamic strain onto the fiber, which generates changes in the reflected Bragg wavelength and, hence, modulates the amplitude of the OFC modes within the reflected spectrum. The amplitude modulation of two counterphase tones is detected to obtain a differential measurement proportional to the ultrasound signal.

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“…An OFC is an optical spectrum composed of a series of equispaced discrete spectral lines [9]. Various methods for generating OFC have been reported such as mode-locking lasers (MLLs) [10], [11], micro-ring resonators [12], [13], electro-optic modulators (EOMs) [14]- [16], and gain-switched lasers [17], [18]. Each one has its own unique virtues and some room for improvement.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Wideband Optical Frequency Comb Generation Based on a Gain-Switched 1550 nm Multi-Transverse Mode Vertical-Cavity Surface-Emitting Laser Subject to Dual Optical Injection

et al. 2020

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A scheme for generating wideband optical frequency comb (OFC) is proposed and experimentally investigated based on a master-slave system. In such a system, a tunable optical resource and a distributed feedback semiconductor laser are utilized as master lasers (MLs), and their outputs provide dual optical injection (DOI) into a slave laser (SL) which is a 1550 nm multi-transverse mode vertical-cavity surface-emitting laser (1550 nm-VCSEL) operating at gain-switched state. For the 1550 nm-VCSEL biased at a relatively high current, two low-order transverse modes LP01 and LP11 can simultaneously lase and possess comparable powers. After loaded a large signal modulation, the 1550 nm-VCSEL can be driven into gain-switched state, and two separated sub-combs originating from two transverse modes can be generated. Through further introducing DOI to the gain-switched 1550 nm-VCSEL, the two sub-combs can link up to form an overall OFC under suitable operation parameters. The experimental results show that, through selecting optimized operating parameters, the bandwidth of the integral OFC within 10 dB amplitude variation can achieve 150.0 GHz. Additionally, the effects of the wavelengths of the two injection lights on the bandwidth of the overall OFC are also analyzed. INDEX TERMS Optical frequency comb, multi-transverse mode vertical-cavity surface-emitting laser, gain-switched, dual optical injection.

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Expansion of VCSEL-Based Optical Frequency Combs in the Sub-THz Span: Comparison of Non-Linear Techniques

Cited by 16 publications

References 29 publications

Gain-switched semiconductor lasers with pulsed excitation and optical injection for dual-comb spectroscopy

Gain-switched semiconductor lasers with pulsed excitation and optical injection for dual-comb spectroscopy

Fast Interrogation of Fiber Bragg Gratings with Electro-Optical Dual Optical Frequency Combs

Experimental Investigation on Wideband Optical Frequency Comb Generation Based on a Gain-Switched 1550 nm Multi-Transverse Mode Vertical-Cavity Surface-Emitting Laser Subject to Dual Optical Injection

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