Solar rejection in laser based underwater communication systems

Giuliano, Giovanni; Laycock, Leslie; Rowe, Duncan; Kelly, Anthony E.

doi:10.1364/oe.25.033066

Cited by 34 publications

(9 citation statements)

References 11 publications

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“…As well as their uses in quantum sensing, DFB lasers have a number of advantages for optical communications. Due to the nature of these devices, they would be ideal candidates for filtered communication systems [12] where background or solar radiation can be rejected reducing crosstalk. This is of particular interest in single photon detection based systems.…”

Section: Dfb Optical Communicationsmentioning

confidence: 99%

Applications of Single Frequency Blue Lasers

Watson

Gwyn

Knapp

et al. 2019

2019 21st International Conference on Transparent Optical Networks (ICTON)

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Gallium nitride (GaN) sources are becoming a regular part of today's world and are now key devices for lighting infrastructures, communications systems and quantum applications, amongst others. In particular, many applications have seen the shift from LEDs to laser diodes to make use of higher powers, higher bandwidths and increased transmission distances. Laser communication systems are well established, however there are applications where the ability to select a single emitted wavelength is highly desirable, such as quantum atomic clocks or in filtered communication systems. Distributed feedback (DFB) lasers have been realised emitting at a single wavelength where the grating structure is etched into the sidewall of the ridge. The main motivation in developing these lasers is for the cooling of ions in atomic clocks; however their feasibility for optical communications is also explored. Narrow linewidth lasers are desirable and this paper will explore how this is achieved. Data rates in excess of 1 Gbit/s have also been achieved in a directly modulated, unfiltered system. These devices lend themselves towards wavelength division multiplexing and filtered optical communications systems and this will be analysed further in the work presented here.

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Section: Dfb Optical Communicationsmentioning

confidence: 99%

Applications of Single Frequency Blue Lasers

Watson

Gwyn

Knapp

et al. 2019

2019 21st International Conference on Transparent Optical Networks (ICTON)

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“…Standard Fabry-Perot (FP) GaN LDs have shown high bandwidths, allowing communication at data rates of multiple gigabits per second [2,3]. However, for many applications, such as cold atom systems [4], spectroscopy [5], medical diagnostics [6], and underwater optical communications [7,8], spectral purity and the ability to select and tune specific wavelengths is extremely important [9]. To address this issue, the development of single-mode GaN-based LDs emitting at blue and green wavelengths have been recently reported [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Device Characteristics and Linewidth Measurement of InGaN/GaN Laser Diodes

et al. 2021

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“…The potential of such devices when applied to visible light communications (VLC) systems is presented here, with interest in wavelength division multiplexing (WDM) a possible application. GaN DFBs can also be used in underwater communications, as the attenuation coefficient of light through water is lower in the blue and green regions compared to in red/IR [8]. As a consequence of this, using a filtered system to reject background noise would improve system performance, allowing solar rejection.…”

Section: Introductionmentioning

confidence: 99%

GaN-based distributed feedback laser diodes for optical communications

Gwyn

Watson

Viola

et al. 2019

Fourth International Conference on Applications of Optics and Photonics

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eOver the past 20 years, research into Gallium Nitride (GaN) has evolved from LED lighting to Laser Diodes (LDs), with applications ranging from quantum to medical and into communications. Previously, off-the-shelf GaN LDs have been reported with a view on free space and underwater communications. However, there are applications where the ability to select a single emitted wavelength is highly desirable, namely in atomic clocks or in filtered free-space communications systems. To accomplish this, Distributed Feedback (DFB) geometries are utilised. Due to the complexity of overgrowth steps for buried gratings in III-Nitride material systems, GaN DFBs have a grating etched into the sidewall to ensure single mode operation, with wavelengths ranging from 405nm to 435nm achieved. The main motivation in developing these devices is for the cooling of strontium ions (Sr +) in atomic clock applications, but their feasibility for optical communications have also been investigated. Data transmission rates exceeding 1 Gbit/s have been observed in unfiltered systems, and work is currently ongoing to examine their viability for filtered communications. Ultimately, transmission through Wavelength Division Multiplexing (WDM) or Orthogonal Frequency Division Multiplexing (OFDM) is desired, to ensure that data is communicated more coherently and efficiently. We present results on the characterisation of GaN DFBs, and demonstrate their capability for use in filtered optical communications systems.

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Solar rejection in laser based underwater communication systems

Cited by 34 publications

References 11 publications

Applications of Single Frequency Blue Lasers

Applications of Single Frequency Blue Lasers

Dynamic Device Characteristics and Linewidth Measurement of InGaN/GaN Laser Diodes

GaN-based distributed feedback laser diodes for optical communications

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