Intensity noise and relaxation oscillation of a fiber-laser sensor array integrated in a single fiber

Ma, Lei; Hu, Yongming; Xiong, Shuidong; Zhang, Meng; Hu, Zhengliang

doi:10.1364/ol.35.001795

Cited by 16 publications

(12 citation statements)

References 6 publications

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“…Up to now, people have presented many investigations on Er-doped laser noises [6][7][8][9][10][11][12][13][14]. However, none of them have presented the intensity noise model of Er-doped fiber laser by means of the quantum dynamics theory.…”

Section: Resultsmentioning

confidence: 99%

Intensity noise of erbium-doped fiber laser based on full quantum theory

et al. 2013

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Traditionally, by means of full quantum theory, we present the intensity noise transfer function of an Er-doped fiber laser, on the basis of which we analyze the spectrum of the intensity noise. Our theoretical results are in agreement with the existing experiment results. This model explains not only how the noise is produced, but also how the spontaneous emission and dipole fluctuations have an effect on the output noise, which cannot be explained via rate equation theory. We analyze the physical sources of various contributions to the noise spectrum as well. The simulation results show that the noise of the Er-doped fiber laser mainly consists of the vacuum noise resulting from the output coupling, dipole fluctuation noise, the pump source intensity noise, and the spontaneous emission from the upper level to the ground level, which provides the theoretical basis for noise suppression. Compared to the solid laser, the Er-doped fiber laser shows lower resonant relaxation oscillation frequency.

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Section: Resultsmentioning

confidence: 99%

Intensity noise of erbium-doped fiber laser based on full quantum theory

et al. 2013

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“…Although, most of RIN will be buried under a detector's shot noise, the RIN peak, associated with the laser's relaxation frequency [20], may skew the measurements. 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].…”

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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“…In figure 3 the laser RINs with different LD powers are also compared in the cases with and without BPF. As shown in the figure, when increasing the pump power, the RRO peak shifts toward higher frequencies and weakens in amplitude, which can be explained by the rate equation model [17]. From figure 3(a), it is apparent that the RIN magnitude with the 39 mW pump power is higher than that at 68 and 294 mW at frequencies beyond the RRO and until 6 MHz, whereas in the latter two cases the difference is very small, indicating that when increasing the pumping power the ASE noise in the fiber laser diminished rapidly.…”

Section: Resultsmentioning

confidence: 83%

The ASE noise of a Yb³⁺-doped phosphate fiber single-frequency laser at 1083 nm

Feng

et al. 2014

Laser Phys. Lett.

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A thorough investigation of the effect of amplified spontaneous emission (ASE) on the noise characteristics of a heavily Yb-doped phosphate fiber single-frequency laser at 1083 nm was made. Both the intensity noise and the frequency noise were measured and analyzed by introducing a band pass filter (BPF) into the fiber laser. For the intensity noise, it was found that the ASE noise is present at frequencies beyond the resonant relaxation oscillation (RRO) and until 6 MHz at low pump intensity, while it is diminished in the high power regime. Under a pump power of 42 mW, a maximum reduction of over 3 dB of the relative intensity noise (RIN) was observed with the help of the BPF. As for the frequency noise, a transition of the dominating noise sources from ASE noise in the low pump intensity condition to pump noise in the high pump intensity condition was observed. In the low power condition, more than 7 dB of the ASE noise was found to add to the frequency noise spectrum. It is believed that the obtained results will be helpful in understanding and optimizing the noise characteristics of this type of fiber laser.

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Intensity noise and relaxation oscillation of a fiber-laser sensor array integrated in a single fiber

Cited by 16 publications

References 6 publications

Intensity noise of erbium-doped fiber laser based on full quantum theory

Intensity noise of erbium-doped fiber laser based on full quantum theory

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

The ASE noise of a Yb³⁺-doped phosphate fiber single-frequency laser at 1083 nm

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Intensity noise and relaxation oscillation of a fiber-laser sensor array integrated in a single fiber

Cited by 16 publications

References 6 publications

Intensity noise of erbium-doped fiber laser based on full quantum theory

Intensity noise of erbium-doped fiber laser based on full quantum theory

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

The ASE noise of a Yb3+-doped phosphate fiber single-frequency laser at 1083 nm

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The ASE noise of a Yb³⁺-doped phosphate fiber single-frequency laser at 1083 nm