Intensity noise characteristics of erbium-doped distributed-feedback fiber lasers

Cranch, Geoffrey A.; Englund, M.; Kirkendall, Clay K.

doi:10.1109/jqe.2003.819540

Cited by 56 publications

(26 citation statements)

References 32 publications

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“…The spectrum also shows several peaks at the lower frequency range between 20 and 70 kHz, corresponding to the relaxation oscillation of the FRL, which was also theoretically predicted and experimentally observed in a single-channel FRL sensor system reported earlier [8]. The relaxation oscillation is a result of the dynamic energy interchange process between the pump photons and the lasing photons through the gain medium [14]. To further verify the ultrasonic detection capability for this channel, the sensor was applied to ultrasonic pulses generated from the same PZT source powered by a repeating 5-cycle 200 kHz sinusoidal voltage signal with peak-to-peak voltage of 20 V. The ultrasonic pulses propagate in the plate as Lamb waves of different modes [15].…”

Section: Methodssupporting

confidence: 75%

Multiplexed fiber-ring laser sensors for ultrasonic detection

Liu¹,

Hu²,

Han³

2013

Opt. Express

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Abstract:We propose and demonstrate a multiplexing method for ultrasonic sensors based on fiber Bragg gratings (FBGs) that are included inside the laser cavity of a fiber-ring laser. The multiplexing is achieved using add-drop filters to route the light signals, according to their wavelengths, into different optical paths, each of which contains a separate span of erbium-doped fiber (EDF) as the gain medium. Because a specific span of EDF only addresses a single wavelength channel, mode completion is avoided and the FBG ultrasonic sensors can be simultaneously demodulated. The proposed method is experimentally demonstrated using a two-channel system with two sensing FBGs in a single span of fiber. fiber multiwavelength erbium-doped fiber laser functionalized with evanescent field interaction," Laser Phys. ©2013 Optical Society of America

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Section: Methodssupporting

confidence: 75%

Multiplexed fiber-ring laser sensors for ultrasonic detection

Liu¹,

Hu²,

Han³

2013

Opt. Express

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“…This is more pronounced for gas lasers such as He-Ne [21] and fiber lasers [22] where the peak appears in the low-frequency region of the spectrum. Therefore, the presence of RIN affects the measurement results and the minimum detectable signals [23] and is a limiting factor, especially in optical remote sensing and meteorology [24]. It has been shown [25] that the RIN peak for some semiconductor lasers is outside the measurement range of interest and does not pose a problem when compared to fiber based lasers.…”

Section: Coherent Detection and Signal Modelingmentioning

confidence: 99%

An all-fiber image-reject homodyne coherent Doppler wind lidar

Abari¹,

Pedersen²,

Mann³

2014

Opt. Express

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Abstract:In this paper, we present an alternative approach to the downconversion (translation) of the received optical signals collected by the antenna of an all-fiber coherent Doppler lidar (CDL). The proposed method, widely known as image-reject, quadrature detection, or in-phase/quadraturephase detection, utilizes the advances in fiber optic communications such that the received signal can be optically down-converted into baseband where not only the radial velocity but also the direction of the movement can be inferred. In addition, we show that by performing a cross-spectral analysis, enabled by the presence of two independent signal observations with uncorrelated noise, various noise sources can be suppressed and a more simplified velocity estimation algorithm can be employed in the spectral domain. Other benefits of this architecture include, but are not limited to, a more reliable measurement of radial velocities close to zero and an improved bandwidth. The claims are verified through laboratory implementation of a continuous wave CDL, where measurements both on a hard and diffuse target have been performed and analyzed.

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“…1(e), and the polarization beat frequency is 18.9 MHz, which is ten to hundred times lower than that measured in most FLs. The relative intensity noise (RIN) of the extremely short DBR-FL was measured using the method outlined in [5] and the RIN spectrum, shown in Fig. 1(f) , where S 'P is the spectral density of the power fluctuations of the FL signal and P AVG is the average FL power.…”

Section: Characterizationsmentioning

confidence: 99%