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Cheng Wang - One of the best experts on this subject based on the ideXlab platform.

  • Relative Intensity noise of a mid infrared quantum cascade laser insensitivity to optical feedback
    Optics Express, 2019
    Co-Authors: Binbin Zhao, Xing-guang Wang, Jinchuan Zhang, Cheng Wang
    Abstract:

    This article experimentally demonstrates that the Relative Intensity noise (RIN) of a mid-infrared quantum cascade laser is insensitive to the optical feedback for feedback ratios up to 31% (−5.1 dB). The RIN of the free-running laser is in the range of −150 dB/Hz to −160 dB/Hz, while the optical feedback induced RIN variation is less than ± 2.0 dB. In addition, the feedback-induced lasing frequency variation is less than 2.0 GHz. Rate equation analyses of the laser are in good agreement with the experimental observations.

  • Relative Intensity noise of a continuous wave interband cascade laser at room temperature
    Optics Letters, 2019
    Co-Authors: Yu Deng, Binbin Zhao, Cheng Wang
    Abstract:

    This Letter investigates the Relative Intensity noise (RIN) characteristics of a continuous-wave 3.4 μm interband cascade laser operated at room temperature. The RIN decreases with an increasing pump current and reaches down to −130  dB/Hz at a frequency of 450 MHz. In addition, it is proved that the current noise of the laser pump source dominates the RIN for frequencies below 100 MHz. The measured RIN is quantitatively in agreement with the theoretical analysis, from which the gain coefficient and the transparent carrier number of the laser are extracted.

  • carrier noise enhanced Relative Intensity noise of quantum dot lasers
    IEEE Journal of Quantum Electronics, 2018
    Co-Authors: Jianan Duan, Xing-guang Wang, Yue-guang Zhou, Cheng Wang, Frederic Grillot
    Abstract:

    This paper numerically investigates the Relative Intensity noise of quantum dot lasers through a rate equation model taking into account both the spontaneous emission and carrier contributions. In particular, results show that the carrier noise originating from the ground and excited states significantly enhances the Relative Intensity noise of the laser, while that from the carrier reservoir does not. Simulations also point out that a large energy interval between the quantum confined levels is more suitable for low-Intensity noise operation due to the reduced contribution from the carrier noise in the excited state. Finally, the carrier noise is found to have little impact on the frequency noise, thus being negligible for the investigation of the spectral linewidth. Overall, this paper is useful for designing low-noise quantum dot oscillators for high-speed communications, optical frequency combs, and radar applications.

  • Relative Intensity noise properties of quantum dot lasers
    Semiconductor Lasers and Applications VIII, 2018
    Co-Authors: Jianan Duan, Xing-guang Wang, Yue-guang Zhou, Cheng Wang, Frederic Grillot
    Abstract:

    In this work, we theoretically investigate the Relative Intensity noise (RIN) properties of quantum dot (QD) lasers through a rate equation model including the Langevin noises and the contribution from the off resonance energy levels. It is shown that the carrier noise significantly enhances the RIN which can be further reduced by properly controlling the energy separation between the first excited and the ground states. In addition, simulations also unveil that the RIN of QD lasers is rather temperature independent which is of prime importance for the development of power efficient light sources. Overall, these results indicate that QD lasers are excellent candidates for the realization of ultra-low noise oscillators hence being advantageous for fiber optics communication networks, short reach optical interconnects and integrated photonics systems.

  • temperature and optical feedback sensitivity of the Relative Intensity noise of epitaxial quantum dot lasers on ge
    Conference on Lasers and Electro-Optics, 2018
    Co-Authors: Yue-guang Zhou, Chunfang Cao, Qian Gong, Jinyi Yan, Cheng Wang
    Abstract:

    This work demonstrates that the Relative Intensity noise of Ge-based epitaxial InAs quantum dot lasers are weakly sensitive to the temperature, while it is more sensitive to the optical feedback at higher bias currents.

Yi Luo - One of the best experts on this subject based on the ideXlab platform.

  • coherently combined dfb laser array chip with reduced Relative Intensity noise
    IEEE Photonics Technology Letters, 2021
    Co-Authors: Xiaoyang She, Bing Xiong, Changzheng Sun, Zhibiao Hao, Lai Wang, Yanjun Han, Jing Wang, Yi Luo
    Abstract:

    The Relative Intensity noise (RIN) behavior of coherently combined DFB laser array by injection locking is experimentally investigated. A monolithically integrated four-element DFB laser array with a splitter and an output coupler is fabricated, and the frequency stabilities of the DFB lasers are improved to ensure a stable injection locking of DFB laser array by a master laser. It is demonstrated that the RIN of the coherently combined laser array is reduced by almost 20 dB at low frequencies compared with the free-running state. The results indicate that monolithic integration of DFB laser array under injection locking can help improve the RIN performance by eliminating variation in coupling delays and phase jitters.

  • reduced Relative Intensity noise of integrated dfb laser array under injection locking
    International Conference on Information Photonics, 2020
    Co-Authors: Xiaoyang She, Bing Xiong, Changzheng Sun, Zhibiao Hao, Jian Wang, Lai Wang, Yanjun Han, Yi Luo
    Abstract:

    A four-element DFB laser array with double Y-branch couplers is monolithically integrated for stable injection locking. Experiment results show that Relative Intensity noise of the laser array is obviously reduced under injection locking.

  • reduced Relative Intensity noise of a coherently combined single mode semiconductor laser array under injection locking
    Physical Review A, 2018
    Co-Authors: Bing Xiong, Changzheng Sun, Zhibiao Hao, Jian Wang, Yanjun Han, Yi Luo, Lai Wang
    Abstract:

    A scheme for reducing the Relative Intensity noise (RIN) of laser source by an injection locked single-mode semiconductor laser array is proposed and demonstrated. Intensity and phase noise of the slave laser under injection locking are first analyzed by rate equations, and the RIN of the injection locked laser array after coherent combining is then estimated. The RIN of the injection-locked $N$-element laser array can be reduced by a factor about $1/N$ over the entire frequency range in the ideal case. Measurements with a two-element distributed feedback laser array confirm the main theoretical predictions and a nearly 3 dB reduction in RIN is obtained. The effect of the key parameters on the RIN of the injection locked array is investigated as well.

  • Relative Intensity noise characteristics of single mode laser array under injection locking
    2017 Asia Communications and Photonics Conference (ACP), 2017
    Co-Authors: Bing Xiong, Changzheng Sun, Zhibiao Hao, Jian Wang, Lai Wang, Yanjun Han, Yi Luo
    Abstract:

    Relative Intensity noise (RIN) of single-mode diode laser array injection-locked by another diode laser is analyzed. The coherent combining phase has significant influence on the RIN at low frequencies, and increasing injection ratio can suppress this problem.

  • suppression of Relative Intensity noise in mutually injection locked dfb laser diodes
    International Semiconductor Laser Conference, 2016
    Co-Authors: Bing Xiong, Changzheng Sun, Zhibiao Hao, Yanjun Han, Yi Luo, Jing Wang, Lai Wang
    Abstract:

    Relative Intensity noise (RIN) characteristics of mutually injection locked distributed feedback (DFB) laser diodes is investigated. RIN around the relaxation oscillation frequency in both lasers is found to be simultaneously suppressed in the mutual locking status.

Gaetan Messin - One of the best experts on this subject based on the ideXlab platform.

  • time resolved detection of Relative Intensity squeezed nanosecond pulses in a 87 rb vapor
    European Quantum Electronics Conference, 2011
    Co-Authors: Imad H. Agha, Christina Giarmatzi, Philippe Grangier, Gaetan Messin
    Abstract:

    Squeezed light is a valuable resource in the fields of continuous-variable quantum information, quantum communication, and quantum optics [1]. In this talk, we demonstrate a system capable of producing pulsed squeezed light via four-wave mixing in a rubidium vapor [2]. By employing a pulsed input [3], we produce nanosecond Relative-Intensity squeezed pulses and employ time-resolved detection to measure the degree of squeezing obtained. With respect to recent noise-spectrum squeezing experiments in atomic vapors [2], the present work is based on time-domain detection. The basic idea behind the generation of Relative-Intensity squeezed light as presented in this work relies on off-resonant four-wave mixing in a double lambda-system [2]. A strong pump, ω p , interacts with a pulsed probe beam, ω s , which is offset from the pump by approximately the hyperfine ground state separation. Under suitable conditions, this energy level structure allows for the parametric amplification of the probe beam while simultaneously creating its quantum-correlated conjugate.

  • time resolved detection of Relative Intensity squeezed nanosecond pulses in an 87rb vapor
    New Journal of Physics, 2011
    Co-Authors: Imad H. Agha, Christina Giarmatzi, Imad Agha, Quentin Glorieux, Thomas Coudreau, Philippe Grangier, Gaetan Messin
    Abstract:

    We present theoretical and experimental results on the generation and detection of pulsed, Relative-Intensity squeezed light in a hot 87Rb vapor. The Intensity noise correlations between a pulsed probe beam and its conjugate, generated through nearly degenerate four-wave mixing in a double-lambda system, are studied numerically and measured experimentally via time-resolved balanced detection. We predict and observe approximately − 1 dB of time-resolved Relative-Intensity squeezing with 50 ns pulses at 1 MHz repetition rate. (− 1.34 dB corrected for loss).

Lai Wang - One of the best experts on this subject based on the ideXlab platform.

  • coherently combined dfb laser array chip with reduced Relative Intensity noise
    IEEE Photonics Technology Letters, 2021
    Co-Authors: Xiaoyang She, Bing Xiong, Changzheng Sun, Zhibiao Hao, Lai Wang, Yanjun Han, Jing Wang, Yi Luo
    Abstract:

    The Relative Intensity noise (RIN) behavior of coherently combined DFB laser array by injection locking is experimentally investigated. A monolithically integrated four-element DFB laser array with a splitter and an output coupler is fabricated, and the frequency stabilities of the DFB lasers are improved to ensure a stable injection locking of DFB laser array by a master laser. It is demonstrated that the RIN of the coherently combined laser array is reduced by almost 20 dB at low frequencies compared with the free-running state. The results indicate that monolithic integration of DFB laser array under injection locking can help improve the RIN performance by eliminating variation in coupling delays and phase jitters.

  • reduced Relative Intensity noise of integrated dfb laser array under injection locking
    International Conference on Information Photonics, 2020
    Co-Authors: Xiaoyang She, Bing Xiong, Changzheng Sun, Zhibiao Hao, Jian Wang, Lai Wang, Yanjun Han, Yi Luo
    Abstract:

    A four-element DFB laser array with double Y-branch couplers is monolithically integrated for stable injection locking. Experiment results show that Relative Intensity noise of the laser array is obviously reduced under injection locking.

  • reduced Relative Intensity noise of a coherently combined single mode semiconductor laser array under injection locking
    Physical Review A, 2018
    Co-Authors: Bing Xiong, Changzheng Sun, Zhibiao Hao, Jian Wang, Yanjun Han, Yi Luo, Lai Wang
    Abstract:

    A scheme for reducing the Relative Intensity noise (RIN) of laser source by an injection locked single-mode semiconductor laser array is proposed and demonstrated. Intensity and phase noise of the slave laser under injection locking are first analyzed by rate equations, and the RIN of the injection locked laser array after coherent combining is then estimated. The RIN of the injection-locked $N$-element laser array can be reduced by a factor about $1/N$ over the entire frequency range in the ideal case. Measurements with a two-element distributed feedback laser array confirm the main theoretical predictions and a nearly 3 dB reduction in RIN is obtained. The effect of the key parameters on the RIN of the injection locked array is investigated as well.

  • Relative Intensity noise characteristics of single mode laser array under injection locking
    2017 Asia Communications and Photonics Conference (ACP), 2017
    Co-Authors: Bing Xiong, Changzheng Sun, Zhibiao Hao, Jian Wang, Lai Wang, Yanjun Han, Yi Luo
    Abstract:

    Relative Intensity noise (RIN) of single-mode diode laser array injection-locked by another diode laser is analyzed. The coherent combining phase has significant influence on the RIN at low frequencies, and increasing injection ratio can suppress this problem.

  • suppression of Relative Intensity noise in mutually injection locked dfb laser diodes
    International Semiconductor Laser Conference, 2016
    Co-Authors: Bing Xiong, Changzheng Sun, Zhibiao Hao, Yanjun Han, Yi Luo, Jing Wang, Lai Wang
    Abstract:

    Relative Intensity noise (RIN) characteristics of mutually injection locked distributed feedback (DFB) laser diodes is investigated. RIN around the relaxation oscillation frequency in both lasers is found to be simultaneously suppressed in the mutual locking status.

L. Pesquera - One of the best experts on this subject based on the ideXlab platform.

  • theoretical calculation of Relative Intensity noise of multimode vertical cavity surface emitting lasers
    IEEE Journal of Quantum Electronics, 2004
    Co-Authors: Angel Valle, L. Pesquera
    Abstract:

    An analytical calculation of Relative Intensity noise spectra of weakly index-guided vertical-cavity surface-emitting lasers (VCSELs) in a multimode regime is performed. We obtain analytical expressions that incorporate the spatial dependence of electrical field and carrier density profiles. Expressions are derived for single-mode and two-transverse-mode operation. Our analysis shows that single-mode noise spectrum depends on the spatial mode profile through a modal effective volume. Two-mode noise spectra also incorporate the dependence on the degree of spatial overlapping between the modes. Two resonance peaks appear in the noise spectra of the individual modes and total power of the two-mode VCSEL. We analytically show that those peaks appear at frequencies that correspond to the relaxation oscillation frequencies of the multimode laser. Simple analytical expressions are also derived for noise spectra at zero frequency.

  • Relative Intensity noise of multitransverse mode vertical cavity surface emitting lasers
    IEEE Photonics Technology Letters, 2001
    Co-Authors: Angel Valle, L. Pesquera
    Abstract:

    Relative Intensity noise (RIN) spectra of weakly index guided vertical-cavity surface-emitting lasers (VCSELs) in a multitransverse-mode regime are analyzed by using a model that takes into account all the transverse modes supported by the waveguide. Several resonance peaks are obtained in the noise spectra that correspond to the relaxation oscillation frequencies of the transverse modes. It is shown that for low spatially overlapping transverse modes, low RIN operation can be maintained. However, the excitation of transverse modes with a significant spatial overlap leads to a clear enhancement of the RIN at low frequencies.

  • Relative Intensity noise of multitransverse mode vertical cavity surface emitting lasers
    Conference on Lasers and Electro-Optics, 1999
    Co-Authors: Angel Valle, L. Pesquera
    Abstract:

    Summary form only given. Relative Intensity noise (RIN) in vertical cavity surface emitting lasers (VCSELs) is important for applications in communications and optical interconnections. It is known that VCSELs tend to lase at high powers in multiple transverse modes due to spatial hole burning (SHE). This behavior can increase the RIN and limit the usefulness of VCSELs in high-speed communications. In the paper it is found that low RIN operation can be maintained for low spatially overlapping modes.