Relative Intensity Noise Measurement of a Single‐Frequency Laser with Ultralow Background

Yihang Yu; Hailin Hu; Dijun Chen; Fang Wei; Fei Yang

doi:10.3788/CJL230592

Chinese Journal of Lasers, Volume. 50, Issue 22, 2201003(2023)

Relative Intensity Noise Measurement of a Single‐Frequency Laser with Ultralow Background

Yihang Yu¹, Hailin Hu^1,2, Dijun Chen¹, Fang Wei¹, and Fei Yang^1、*

¹Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

²School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

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Figures & Tables(12)

Fig. 1. Ultra-low background single-frequency laser relative intensity noise measurement system

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Fig. 2. Measurement limits change with photocurrent

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Fig. 3. Measurement results of DFB-1782 laser under different photocurrents. (a) Power spectral density; (b) relative intensity noise

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Fig. 4. Relative intensity noise before and after EDFA amplification

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Fig. 5. Relative intensity noise of typical lasers

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Fig. 6. Intensity noise measurement system for intensity modulation

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Fig. 7. Relative intensity noise after adding sinusoidal wave modulated signal. (a) 60 MHz; (b) 600 MHz; (c) 2 GHz

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Table 1. Shot noise limit of high bandwidth InGaAs photodetectors
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Table 1. Shot noise limit of high bandwidth InGaAs photodetectors
Manufacturer Model Max photocurrent^* $I_{d c}$ /mA Shot noise limit $R I N_{s h o t}$ /（dBc·Hz^-1）
Discovery DSC10H 10 -165.0
Thorlabs DX20AF 9 -164.5
CETC
PD-18G-V
Custom one of this work
6
40
-162.7
-171.0

Table 2. Thermal noise in the results of relative intensity noise under each photocurrent
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Table 2. Thermal noise in the results of relative intensity noise under each photocurrent
I_dc /mA RIN_th /（dBc·Hz^-1）
1 -157.8
5 -171.8
10 -177.8
40 -189.8

Table 3. Thermal noise level of common spectrum analyzers
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Table 3. Thermal noise level of common spectrum analyzers
Model Manufacturer Thermal noise floor /（dBm·Hz^-1）
SR770 Stanford Research Systems -155
RTSA-R5550 ThinkRF -145
FPL1000 Rohde & Schwarz -156
N9040B Keysight -160

Table 4. Thermal noise of spectrum analyzer in the results of relative intensity noise under each photocurrent
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Table 4. Thermal noise of spectrum analyzer in the results of relative intensity noise under each photocurrent
I_dc /mA RIN_ESA /（dBm·Hz^-1）
1 -141
5 -155
10 -161
40 -173

Table 5. Noise level after sinusoidal wave modulation at different frequencies
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Table 5. Noise level after sinusoidal wave modulation at different frequencies
Input amplitude /V Noise level /（dBc·Hz^-1）
60 MHz signal 600 MHz signal
60 MHz 120 MHz 240 MHz 600 MHz 1.2 GHz 1.8 GHz
2 -113.6 -154.4 -154.1 -121.9 -136.3 -148.5
1 -119.1 -161.8 -161.3 -128.8 -161.1 -152.8

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Yihang Yu, Hailin Hu, Dijun Chen, Fang Wei, Fei Yang. Relative Intensity Noise Measurement of a Single‐Frequency Laser with Ultralow Background[J]. Chinese Journal of Lasers, 2023, 50(22): 2201003

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