On-Chip Investigation of Phase Noise in Monolithically Integrated Gain-Switched Lasers

Alexander, Justin K.; Morrissey, Padraic E.; Caro, Ludovic; Dernaika, Mohamad; Kelly, Niall P.; Peters, Frank

doi:10.1109/lpt.2017.2682560

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…In each of these cases, both coupled lasers were biased above threshold current, therefore operating in a mutually coupled system. Further experimental analysis into the benefits of the on-chip coupling of gain-switched lasers, particularly in relation to the laser's linewidth and phase noise, were investigated in [5] and [12] respectively. These examples use a similar fabrication material, process and design as the example described in this paper, and so their results are assumed to be equivalent to the linewidth and phase noise of the device in this work.…”

Section: Introductionmentioning

confidence: 99%

Gain Switched Frequency Comb Enhancement Using Monolithically Integrated Mutually Coupled Lasers

McCarthy,

Jia,

Kelleher

et al. 2023

IEEE Photon. Technol. Lett.

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A tunable comb source is demonstrated through gain switching a three sectioned photonic integrated circuit (PIC). The PIC consists of two mutually coupled lasers, integrated on an InP epistructure. One of these lasers is a tunable, twosection, single mode laser and its tunability is demonstrated by varying the bias current across the two sections, producing distinct wavelengths with a tunable range of 1535 -1560 nm. The second laser is a simple Fabry-Pérot cavity laser which can be phase-locked with the single mode laser. Frequency combs were produced by phase-locking the two lasers and then gain switching the Fabry-Pérot laser by applying a high power radio frequency (RF) signal. In this paper we explore the effects that the biasing symmetry between the two coupled lasers has on the resulting gain switched comb. We demonstrate that a mutually coupled system results in enhanced gain switched frequency combs with a broader bandwidth and higher power compared to the asymmetrically biased coupling.

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Section: Introductionmentioning

confidence: 99%

Gain Switched Frequency Comb Enhancement Using Monolithically Integrated Mutually Coupled Lasers

McCarthy,

Jia,

Kelleher

et al. 2023

IEEE Photon. Technol. Lett.

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“…In Reference 21 the authors gain switch two types of integrated two‐section lasers to generate OFCs with a free spectral range (FSR) that can be tuned from 5 to 15 GHz. In Reference 22, the authors demonstrate that the phase noise of on‐chip monolithically integrated devices increases with gain‐switching without applying OIL, and decreases under the influence of OIL from a purer master laser. However, such PICs require sophisticated and complex regrowth steps that reduce the yield and increase the cost of fabrication.…”

Section: Introductionmentioning

confidence: 99%

Photonically integrated gain‐switched lasers for optical frequency comb generation

Hammad

Lakshmijayasimha

Kaszubowska-Anandarajah

et al. 2021

Micro & Optical Tech Letters

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The authors present the complete characterization of two cost-efficient photonically integrated slotted lasers that offer regrowth free manufacturing. Furthermore, the application of these devices, as multi-carrier transmitters is also investigated. In particular, the authors employ gain switching, an optical frequency comb (OFC) generation technique based on the direct modulation. The first device used is a dual section discrete mode index patterned device. It comprises two sections, implemented in a master-slave configuration to achieve optical injection locking (OIL) of the slave section. The second, a foursection device, consists of two regrowth-free Fabry-Perot lasers, also forming a master-slave configuration. The authors demonstrate that the additional sections give finer control over the OIL parameters of the device. Results show that the OIL leads to the enhancement of the modulation bandwidth, which in turn can be used to generate a broader OFC. The generated OFC is characterized to demonstrate additional improvements brought

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“…The repetition rate of frequency combs from integrated sources can be reduced by pulse-picking [52] or by sideband generation using single-frequency lasers and electro-optic modulation [53] or gain-switching [54,55]. However, these methods provide only low power efficiency (in case of pulse-picking), fundamentally broader linewidths of the comb lines (cascaded electro-optic modulation), or jitter (gain-switching).…”

Section: Exploring Diode Laser Mode-locking Toward Low Repetition Ratesmentioning

confidence: 99%

“…A disadvantage of this method is that the linewidth of the m-th order sideband is m times higher than the linewidth of the modulation frequency [179]. There are also reports of comb generation via gain-switching at 6 GHz [54] and 5 GHz [55], however, this approach suffers from timing jitter [177].…”

Section: The Problem Of High Loss In Diode Lasersmentioning

confidence: 99%

Extending hybrid integrated diode lasers to multi-frequency oscillation

Mak¹

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On-Chip Investigation of Phase Noise in Monolithically Integrated Gain-Switched Lasers

Cited by 6 publications

References 11 publications

Gain Switched Frequency Comb Enhancement Using Monolithically Integrated Mutually Coupled Lasers

Gain Switched Frequency Comb Enhancement Using Monolithically Integrated Mutually Coupled Lasers

Photonically integrated gain‐switched lasers for optical frequency comb generation

Extending hybrid integrated diode lasers to multi-frequency oscillation

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