Performance characteristics of 1.5-µm external cavity semiconductor lasers for coherent optical communication

Olsson, N.A.; Ziel, J. van der

doi:10.1109/jlt.1987.1075530

Cited by 42 publications

(4 citation statements)

References 14 publications

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“…This was explained in detail (Henry, 1983;Vahala and Yariv, 1983). It was found that the linewidth of a semiconductor laser could be narrowed from several tens of megahertz to a few kilohertz by external feedback (Wyatt and Devlin, 1983;Link and Pollack, 1986;Olsson and Van der Ziel, 1987). Modification of the Langevin rate equations of a laser to account for the effect of feedback led to a thorough understanding of this narrowing (Patzak et al, 1983;Kazarinov and Henry, 1987).…”

Section: B Practical Treatments Of Quantum Noisementioning

confidence: 99%

Quantum noise in photonics

Henry¹,

Kazarinov²

1996

Rev. Mod. Phys.

162

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The basic equations governing noise phenomena are derived from first principles and applied to examples in optical communications. Quantum noise arises from two sources, the momentum fluctuations of electrons at optical frequencies and the uncertainty-related fluctuations of the electromagnetic field. Shot noise results from the beating of the noise sources with the signal field. In high-gain amplifiers, the spontaneous-emission noise dominates shot noise and results in a noise figure of at least 3 dB. It is shown explicitly how, at high power, both the laser field and the laser noise source become classical. The increase in noise in lasers with open cavities is not due to enhanced spontaneous emission as once thought, but to single-pass amplification. The noise fields and spontaneous currents have Gaussian distributions, while nonlasing modes have exponential photon-number distributions. Low-frequency intensity fluctuations arise from the electric current driving the laser and can be sub-Poissonian, in contrast to shot noise, which has a Poissonian distribution. The calculational tools are a wave equation for the field operator and a rate equation for the carrier-number operator, each containing spontaneous current noise sources. The correlation functions of these sources are determined by the fluctuation-dissipation theorem.[S0034-6861(96)00503-X]

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Section: B Practical Treatments Of Quantum Noisementioning

confidence: 99%

Quantum noise in photonics

Henry¹,

Kazarinov²

1996

Rev. Mod. Phys.

162

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“…The eye-safe lasers around 1.5 µm are of great importance for such kinds of potential applications, such as optical communications, optical sensing, lidar, and medicine [1][2][3]. Usually, only limited wavelengths can be generated directly by the gain media due to their fixed energy-level structures.…”

Section: Introductionmentioning

confidence: 99%

Diode-Pumped Actively Q-Switched Nd:YVO4/RTP Intracavity Raman Laser at 1.49 µm

et al. 2019

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For the first time, a diode-pumped actively Q-switched Nd:YVO4/RbTiOPO4 (RTP) intracavity Raman laser at 1.49 µm was demonstrated to the best of our knowledge. Experimentally, a dual-end diffusion-bonded YVO4–Nd:YVO4–YVO4 crystal was employed as the laser medium to generate 1.34 µm laser radiation, and an RTP crystal as the Raman medium to enable the frequency conversion, by which radiation at 1.49 µm was achieved successfully. With an incident pump power of 10.4 W, an average output power of 502 mW was obtained at a pulse repetition rate of 15 kHz, corresponding to a conversion efficiency of 4.8%.

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“…Several studies have introduced the important parameters and contributions [2,18,19], noting that the inherent linewidth depends on feedback from the external cavity. Experimental investigations have addressed the effect of cavity length [2,20], power [21,22], grating parameters [23], and detuning of the external cavity mode relative to the grating angle [24,25].…”

Section: Introductionmentioning

confidence: 99%

Linewidths below 100 kHz with external cavity diode lasers

Saliba

Scholten

2009

Appl. Opt.

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The linewidth of external cavity diode lasers (ECDLs) is an increasingly important characteristic for experiments in coherent optical communications and atomic physics. The Schawlow-Townes and time-averaged linewidths depend on free parameters of the design, such as cavity length, power, and grating characteristics. We show that the linewidth is also sensitive to the focus, set by the distance between the laser and the collimating lens, due to the effect on the external cavity backcoupling efficiency. By considering these factors, a simple ECDL can readily achieve linewidths below 100 kHz.

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Performance characteristics of 1.5-µm external cavity semiconductor lasers for coherent optical communication

Abstract: The performance characteristics of 1.5-ym external cavity ETALON GRATING

Cited by 42 publications

References 14 publications

Quantum noise in photonics

Quantum noise in photonics

Diode-Pumped Actively Q-Switched Nd:YVO4/RTP Intracavity Raman Laser at 1.49 µm

Linewidths below 100 kHz with external cavity diode lasers

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