RF Linewidth in Monolithic Passively Mode-Locked Semiconductor Laser

Kéfélian, F.; O'Donoghue, S.; Todaro, M. T.; McInerney, John G.; Huyet, Guillaume

doi:10.1109/lpt.2008.926834

Cited by 151 publications

(75 citation statements)

References 10 publications

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“…An additional performance metric that is specifically related to optical combs is the RF linewidth [59], i.e., the linewidth of the beat tone seen on an electrical spectrum analyzer (ESA) (PXA Signal Analyzer, Agilent Technologies, Santa Clara, USA) when the entire spectrum of the SS-MLL is sent to a photoreceiver (the full test methodology is described in the appendix). This RF line results from the beating between adjacent comb lines and has a frequency corresponding to the FSR of the laser.…”

Section: Single Section Mode-locked Lasersmentioning

confidence: 99%

Silicon photonics WDM transmitter with single section semiconductor mode-locked laser

Müller

Hauck

Shen

et al. 2015

Advanced Optical Technologies

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Abstract:We demonstrate a wavelength domain-multiplexed (WDM) optical link relying on a single section semiconductor mode-locked laser (SS-MLL) with quantum dash (Q-Dash) gain material to generate 25 optical carriers spaced by 60.8 GHz, as well as silicon photonics (SiP) resonant ring modulators (RRMs) to modulate individual optical channels. The link requires optical reamplification provided by an erbium-doped fiber amplifier (EDFA) in the system experiments reported here. Open eye diagrams with signal quality factors (Q-factors) above 7 are measured with a commercial receiver (Rx). For higher compactness and cost effectiveness, reamplification of the modulated channels with a semiconductor optical amplifier (SOA) operated in the linear regime is highly desirable. System and device characterization indicate compatibility with the latter. While we expect channel counts to be primarily limited by the saturation output power level of the SOA, we estimate a single SOA to support more than eight channels. Prior to describing the system experiments, component design and detailed characterization results are reported including design and characterization of RRMs, ring-based resonant optical add-drop multiplexers (RROADMs) and thermal tuners, S-parameters resulting from the interoperation of RRMs and RR-OADMs, and characterization of Q-Dash SS-MLLs reamplified with a commercial SOA. Particular emphasis is placed on peaking effects in the transfer functions of RRMs and RR-OADMs resulting from transient effects in the optical domain, as well as on the characterization of SS-MLLs in regard to relative intensity noise (RIN), stability of the modes of operation, and excess noise after reamplification.

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Section: Single Section Mode-locked Lasersmentioning

confidence: 99%

Silicon photonics WDM transmitter with single section semiconductor mode-locked laser

Müller

Hauck

Shen

et al. 2015

Advanced Optical Technologies

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“…Semiconductor mode-locked diode lasers (MLLs) are compact, rugged, and efficient sources of ultra-short, intense, and highrepetition frequency optical pulses with many potential applications such as all-optical clock recovery, lidar, optical frequency combs, and telecommunications [1][2][3]. A major limitation of MLLs for most practical applications is their very high timing jitter and phase noise, as spontaneous emission noise and cavity losses make MLLs prone to broad linewidths and, therefore, substantial phase noise [4]. To improve the timing jitter, several experimental methods such as single-cavity feedback [5][6][7][8], coupled optoelectronic oscillators [9], injection locking [10][11][12], and dual-loop feedback [13][14][15] have been proposed and demonstrated.…”

mentioning

confidence: 99%

Asymmetric dual-loop feedback to suppress spurious tones and reduce timing jitter in self-mode-locked quantum-dash lasers emitting at 155 μm

Asghar¹,

McInerney²

2017

Opt. Lett.

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“…Typically, the lasers emitted pulses of some few picoseconds and an optical spectrum of up to 200 modes. The lasers were coupled to a high-frequency photodiode, and the RF linewidth of the first four harmonics was measured using a 50 GHz electronic spectrum analyzer and the fitting method described in [12]. The RF line shape approximated well to a Lorentzian (Fig.…”

mentioning

confidence: 99%

Optical linewidth of a passively mode-locked semiconductor laser

et al. 2009

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International audienceWe measured the optical linewidths of a passively mode-locked quantum dot laser and show that, in agree-ment with theoretical predictions, the modal linewidth exhibits a parabolic dependence with the mode op-tical frequency. The minimum linewidth follows a Schawlow–Townes behavior with a rebroadening at high power. In addition, the slope of the parabola is proportional to the RF linewidth of the laser and can there-fore provide a direct measurement of the timing jitter. Such a measurement could be easily applied to mode-locked semiconductor lasers with a fast repetition rate where the RF linewidth cannot be directly measured. Optical frequency combs have become important tools for time and frequency metrology [1]. They have also been identified as potential sources for coherent communications and signal processing [2]. Optical frequency combs are commonly generated by mode-locked lasers (MLLs) that periodically emit short pulses with an optical spectrum composed of a set of equally spaced narrow lines. Some metrology appli-cations require octave spanning combs generated by Ti:sapphire lasers where the pump intensity and the cavity length fluctuations constitute the main sources of noise. Coherent communications and sig-nal processing require a much narrower frequency line set that can be generated by monolithic passively mode-locked semiconductor lasers where the sponta-neous emission constitutes the main source of noise in a large Fourier frequency range. In recent years monolithic quantum dot (QD) MLLs have shown much promise in producing stable pulses, of the order of picoseconds, with high repetition rates and low timing jitter [3–5]. In general, noise influences mainly the amplitude, the central optical frequency, the comb line to comb line frequency spacing, the pulse-to-pulse timing, and the optical phase of mode-locked semiconductor lasers, but the broadening of the comb lines [6] is dominated by the contributions of optical phase noise and pulse-to-pulse timing fluctuations. The quantum limited fluctuations of the optical phase induce a Lorentzian line shape in all the comb lines, similarly to the Schawlow–Townes line shape of single-mode lasers. The optical linewidth is also related to timing jitter fluctuations. The stochastic dynamics of MLLs can be described by a set of Langevin equations [7] capturing the evolution of the power, frequency, tim-ing jitter, and optical phase of the laser. By retaining only the timing jitter and the optical phase fluctua-tions, the optical field is [8] A͑t͒ =

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RF Linewidth in Monolithic Passively Mode-Locked Semiconductor Laser

Cited by 151 publications

References 10 publications

Silicon photonics WDM transmitter with single section semiconductor mode-locked laser

Silicon photonics WDM transmitter with single section semiconductor mode-locked laser

Asymmetric dual-loop feedback to suppress spurious tones and reduce timing jitter in self-mode-locked quantum-dash lasers emitting at 155 μm

Optical linewidth of a passively mode-locked semiconductor laser

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