Search Results - "laser diode"
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The effect of temperature on high power laser diode
Published 2008“…The temperature was found to be higher without the fan in the system which reduced the intensity of the laser diode…”
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Effect Of Fibre Tapering On The Laser Diode-Fibre Coupling
Published 2006“…This thesis will examine the use of 1550 nm laser diode as the light source for the study on the tapered fibres effectiveness to improve coupling efficiency. …”
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Active alignment and reliable pigtailing of laser diode transmitter
Published 2008“…In this paper we present theoretical and experimental analysis on Nd:YAG laser microwelding for pigtailing laser diode transmitter through two ball lenses that are employed for effectively matching the elliptical mode field of the laser diode with the circular on of the single mode fiber. …”
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Coupling and attachment of single mode fiber into laser diode transmitter
Published 2008“…In this paper we present some investigations and analysis of various parameters that contribute for increasing the coupling efficiency of laser diode to single mode fiber coupling using ball lenses coupling scheme. …”
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In GaN Double Heterostructure (DH) Laser Diode Performance And Optimization.
Published 2007“…The laser performances of the blue DH InGaN laser diode (LD) structures have been numerically investigated by using ISE TCAD software.…”
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Characterisation, emulation and by-emitter degradation analysis of high power semiconductor laser diodes
Published 2010“…The characterisation, emulation and by-emitter degradation analysis of two types of high power semiconductor laser diodes are presented in this thesis as part of an European Union (EU) project. …”
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Theoretical investigation of coupling between a laser diode and a lensed fiber
Published 2003“…In this paper, we present a simple analysis, utilising the ABCD transformation matrix method, to analyze and determine the coupling efficiency between a laser diode and a conically lensed fiber. The calculated and measured results, i.e. the coupling efficiencies, were compared for microlenses etched at 20, 30 and 40 minutes. …”
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High-power operation of coherently coupled tapered laser diodes in an external cavity
Published 2016“…Two high-brightness high-power tapered laser diodes are coherently combined using a Michelson-based cavity. …”
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Synchronisation and chaos in a laser diode driven by a resonant tunnelling diode
Published 2008“…The authors report on a hybrid integration of a resonant tunnelling diode laser diode driver configuration that can operate as a self-oscillating circuit, and when externally perturbed shows regions of frequency division and frequency multiplication, quasi-periodic and chaotic oscillations, both in the optical and electrical outputs. …”
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10
A tolerant and efficient laser diode to single mode fiber coupling scheme
Published 2007“…In this paper we present the result of investigations and analysis of various parameters that contribute to the increased coupling efficiency between a laser diode and a single mode fiber coupling using ball lenses coupling scheme. …”
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Separate phase-locking and coherent combining of two laser diodes in a Michelson cavity
Published 2015“…We describe a new coherent beam combining architecture based on passive phase-locking of two laser diodes in a Michelson external cavity on their rear facet, and their coherent combination on the front facet. …”
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Self-oscillation and period adding from resonant tunnelling diode-laser diode circuit
Published 2008“…A hybrid optoelectronic integrated circuit comprising a laser diode driven by a resonant tunnelling diode can output various optical and electrical signal patterns that include self-sustained oscillations, subharmonic and harmonic locking and unlocked signals, with potential applications in optical communication systems. © 2008 The Institution of Engineering and Technology.…”
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14
A self-synchronized optoelectronic oscillator based on an RTD photodetector and a laser diode
Published 2011“…We propose and demonstrate a simple and stable low-phase noise optoelectronic oscillator (OEO) that uses a laser diode, an optical fiber delay line, and a resonant tunneling diode (RTD) free-running oscillator that is monolithic integrated with a waveguide photodetector. …”
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15
The comparison of dual wavelength fiber laser spectrum in SMF and HNLF by utilizing laser diode
Published 2016“…A dual-wavelength erbium-doped fiber (EDF) fiber ring laser in single mode fiber and highly nonlinear fiber is demonstrated and both optical spectrums are compared at 400 mA of Laser Diode (LD) output. The fiber ring laser cavity incorporated sagnac loop had been applied for the laser to lase two wavelengths simultaneously due to high birefringent in polarizaton-maintaining fiber (PMF). …”
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Analysis of efficiency and misalignment tolerances in laser diode pigtailing using single ball lens
Published 2007“…In this paper we present some investigations and analysis on coupling efficiency and misalignment tolerances in coupling of laser diode to single mode fiber using single ball lens of (diameter = 1mm, and refractive index n = 1.8333). …”
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17
Dual ball lenses for relaxed alignment tolerances in pigtailing of a laser diode transmitter
Published 2007“…In this paper a butterfly laser diode transmitter module is coupled into single mode fiber via dual small ball lenses, which are aligned and fixed during an active alignment process where the laser diode is powered and the output power is continuously measured to determine the optimum positions for maximum coupling efficiency and then fixed in their holder and to the main substrate by laser welding technique using Nd:Yag laser welding. …”
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Analysis of the impact of external optical feedback on the performance of high-power and high-brightness laser diodes
Published 2017“…This work contributes to the knowledge of how external feedback alters the performance of high-brightness laser diodes. It shows that unintentional feedback can lead to the degradation of output power, power conversion efficiency and beam quality. …”
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Synchronizing optical to wireless signals using a resonant tunneling diode laser diode circuit
Published 2008“…We report on a wireless to optical interface consisting of a laser diode driven by resonant tunneling diode. Circuit electrical behavior and laser output are well predicted by a Liénard's driven oscillator model. ©2008 IEEE.…”
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High frequency optoelectronic oscillators based on the optical feedback of semiconductor mode-locked laser diodes
Published 2012“…Optical self seeding feedback techniques can be used to improve the noise characteristics of passively mode-locked laser diodes. External cavities such as fiber optic cables can increase the memory of the phase and subsequently improve the timing jitter. …”
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