Richard Laming - Academia.edu (original) (raw)

Papers by Richard Laming

Research paper thumbnail of Simulation of 50GHz Transmission Over 50km of Standard Fibre using Mid-point Spectral Inversion for Dispersion Compensation

Nonlinear Guided-Wave Phenomena

Transmission of 6ps linear pulse pairs over 50km of standard fibre is demonstrated by employing m... more Transmission of 6ps linear pulse pairs over 50km of standard fibre is demonstrated by employing midpoint spectral-inversion (phase conjugation) of the data signal to compensate dispersion effects. Pulse broadening as low as 10% and faithful reconstruction of the pulse patterns is observed and confirms the applicability of this technique to bit-rates greater than 100 Gbits-1.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dispersion Compensation Gratings

Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides: Applications and Fundamentals

Broadband Chirped fibre gratings allow the upgrade of the existing non-dispersion shifted fibre n... more Broadband Chirped fibre gratings allow the upgrade of the existing non-dispersion shifted fibre network to high data rate operation within the 1.55μm low-loss window. The design, fabrication, performance and application of these devices is covered.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Reseau de guide d'ondes

Reseau de guide d'ondes (AWG) (1) comprenant un substrat possedant un premier groupe de guide... more Reseau de guide d'ondes (AWG) (1) comprenant un substrat possedant un premier groupe de guide d'ondes (8) couple optiquement entre un premier et un deuxieme coupleur a plaque (3, 4) et un deuxieme groupe de guide d'ondes d'entree/sortie (10) couples optiquement par leurs premieres extremites a un cote entree/sortie (5) du deuxieme coupleur a plaque (4). Ces guides d'ondes d'entree/sortie se retrecissent au niveau de premieres parties d'extremite (13), de maniere a croitre en largeur vers le deuxieme coupleur a plaque, et la largeur (W) des premieres extremites des guides d'ondes d'entree/sortie varie a travers le deuxieme groupe (10), de maniere a augmenter l'uniformite d'au moins un parametre de performance, par exemple, echo magnetique contigu (AXT). Dans le mode de realisation decrit, la largeur (W) des extremites decroissantes du guide d'ondes augmente depuis un cote du groupe de guides d'ondes d'entree/sortie (10) jusqu&#3...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Equalisation of Spectral Non-Uniformities in Broad-Band Chirped Fibre Gratings

Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides: Applications and Fundamentals

The use of chirped fibre Bragg gratings (FBGs) in a dispersion compensating role has been shown t... more The use of chirped fibre Bragg gratings (FBGs) in a dispersion compensating role has been shown to be a successful technology with great promise for future network upgrades [1,2]. A natural consequence of using FBGs in a negative dispersion sense is that although the structure is designed to phase-match forward- and backward-propagating LP01 modes, the phase-matching condition for coupling from the forward propagating fundamental mode to a higher order cladding-mode is also met for wavelengths just below that of the fundamental Bragg reflection. Because propagation in cladding-modes is extremely lossy there is a significant out-coupling of this shorter wavelength light. The chirped nature of FBGs designed for broad-band (> 5 nm) dispersion compensation means that this cladding-mode loss is integrated along the length of the grating with the result that the reflection spectrum has a slope extending from the short wavelength edge of the useable bandwidth. In a practical transmissio...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Design of apodised linearly-chirped fibre gratings for optical communications

The dispersion characteristics of hepatised linearly-chirped fibre gratings have been studied sys... more The dispersion characteristics of hepatised linearly-chirped fibre gratings have been studied systematically. It is shown that the hyperbolic tangent profile results in an overall superior performance, as it provides highly linearised time-delay characteristics with minimum reduction in the linear dispersion. To compensate for the linear dispersion of 100 km of standard telecom fibre over certain bandwidth (in nm), the required grating length is 19.24 cm/nm.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Short-wavelength, transmission-loss suppression in Fibre Bragg Gratings

StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission loss... more StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission losses in standard FBG's. We show that short wavelength, transmission losses can be practically eliminated by damping the resonant excitation of the cladding modes. The damping is achieved by properly introducing a substantial propagation loss into the cladding modes. For maximum effect, the core mode should experience no extra propagation losses. By applying a thin lossy layer on the fibre cladding surface, a reduction of cladding-mode- losses of about 12dB was achieved. Transmission-loss suppression The cladding mode attenuation can be easily achieved by depositing a thin lossy layer on the cladding surface. Alternatively, the same effect can be accomplished by introducing one or more lossy layers into the fibre cladding during the fabrication process. The latter will result in a stronger cladding-modellossy-material overlap and, therefore, produce higher propagation losses.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Short-wavelength, transmission-loss suppression in Fibre Bragg Gratings

StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission loss... more StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission losses in standard FBG's. We show that short wavelength, transmission losses can be practically eliminated by damping the resonant excitation of the cladding modes. The damping is achieved by properly introducing a substantial propagation loss into the cladding modes. For maximum effect, the core mode should experience no extra propagation losses. By applying a thin lossy layer on the fibre cladding surface, a reduction of cladding-mode- losses of about 12dB was achieved. Transmission-loss suppression The cladding mode attenuation can be easily achieved by depositing a thin lossy layer on the cladding surface. Alternatively, the same effect can be accomplished by introducing one or more lossy layers into the fibre cladding during the fabrication process. The latter will result in a stronger cladding-modellossy-material overlap and, therefore, produce higher propagation losses.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Short-wavelength, transmission-loss suppression in Fibre Bragg Gratings

StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission loss... more StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission losses in standard FBG's. We show that short wavelength, transmission losses can be practically eliminated by damping the resonant excitation of the cladding modes. The damping is achieved by properly introducing a substantial propagation loss into the cladding modes. For maximum effect, the core mode should experience no extra propagation losses. By applying a thin lossy layer on the fibre cladding surface, a reduction of cladding-mode- losses of about 12dB was achieved. Transmission-loss suppression The cladding mode attenuation can be easily achieved by depositing a thin lossy layer on the cladding surface. Alternatively, the same effect can be accomplished by introducing one or more lossy layers into the fibre cladding during the fabrication process. The latter will result in a stronger cladding-modellossy-material overlap and, therefore, produce higher propagation losses.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electric current sensors employing spun highly birefringent optical fibers

Journal of Lightwave Technology, 1989

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 2×2 fused fiber null couplers with asymmetric waist cross sections for polarization independent (>0.01 dB) switching

Journal of Lightwave Technology, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The effect of four-wave mixing in fibers on optical frequency-division multiplexed systems

Journal of Lightwave Technology, 1990

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Chirped moire fiber gratings operating on two-wavelength channels for use as dual-channel dispersion compensators

IEEE Photonics Technology Letters, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Sinc-sampled fiber Bragg gratings for identical multiple wavelength operation

IEEE Photonics Technology Letters, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Rayleigh scattering effect on the gain efficiency and noise of erbium-doped fiber amplifiers

IEEE Journal of Quantum Electronics, 1995

... Richard I. Laming was bom in Sheffield, England. on March 12, 1962. He received a first ... h... more ... Richard I. Laming was bom in Sheffield, England. on March 12, 1962. He received a first ... hundred publications. In 1988 and 1990, he was awarded the Pirelli and Senior Pirelli Research Fellowships respectively. In October ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of apodized linearly chirped fiber gratings for optical communications

IEEE Journal of Quantum Electronics, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of United States Patent ( 19 ) Payne et al . 54 ERBIUM-DOPED FIBRE AMPLIFIER WITH SHAPEID SPECTRAL GAIN 75 Inventors

3.988,697 10/1976 Cooley . 4,143,332 3/1979 Michan et al. ....................... 330/4.3 4.551,6... more 3.988,697 10/1976 Cooley . 4,143,332 3/1979 Michan et al. ....................... 330/4.3 4.551,684 1 1/1985 Bernhardt ............................ 330/4.3 4,794,346 2/1988 Miller ................................... 330/4.3 4,938,556 7/1990 Digannett et al. .................. 330/4.3 4,947,134 8/1990 Olsson .................................. 330/.43 4,955,025 9/1990 Mears et al. ............................ 372/6 5,067,789 1 1/1991 Hall et al. ............................. 385/27

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optical power monitor

Bookmarks Related papers MentionsView impact

Research paper thumbnail of l E. Ronnekleiv is a Ph.D. student on leave from the NTNU university in Norway. He is employed and sponsored by Optoplan AS, Norway

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Performance limits of erbium-doped-fiber amplifiers due to internal Rayleigh backscattering

Conference on Optical Fiber Communication/International Conference on Integrated Optics and Optical Fiber Communication, 1993

Bookmarks Related papers MentionsView impact

Research paper thumbnail of <title>Current Monitor Using Elliptical Birefringent Fibre And Active Temperature Compensation</title>

Fiber Optic Sensors II, 1987

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Simulation of 50GHz Transmission Over 50km of Standard Fibre using Mid-point Spectral Inversion for Dispersion Compensation

Nonlinear Guided-Wave Phenomena

Transmission of 6ps linear pulse pairs over 50km of standard fibre is demonstrated by employing m... more Transmission of 6ps linear pulse pairs over 50km of standard fibre is demonstrated by employing midpoint spectral-inversion (phase conjugation) of the data signal to compensate dispersion effects. Pulse broadening as low as 10% and faithful reconstruction of the pulse patterns is observed and confirms the applicability of this technique to bit-rates greater than 100 Gbits-1.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Dispersion Compensation Gratings

Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides: Applications and Fundamentals

Broadband Chirped fibre gratings allow the upgrade of the existing non-dispersion shifted fibre n... more Broadband Chirped fibre gratings allow the upgrade of the existing non-dispersion shifted fibre network to high data rate operation within the 1.55μm low-loss window. The design, fabrication, performance and application of these devices is covered.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Reseau de guide d'ondes

Reseau de guide d'ondes (AWG) (1) comprenant un substrat possedant un premier groupe de guide... more Reseau de guide d'ondes (AWG) (1) comprenant un substrat possedant un premier groupe de guide d'ondes (8) couple optiquement entre un premier et un deuxieme coupleur a plaque (3, 4) et un deuxieme groupe de guide d'ondes d'entree/sortie (10) couples optiquement par leurs premieres extremites a un cote entree/sortie (5) du deuxieme coupleur a plaque (4). Ces guides d'ondes d'entree/sortie se retrecissent au niveau de premieres parties d'extremite (13), de maniere a croitre en largeur vers le deuxieme coupleur a plaque, et la largeur (W) des premieres extremites des guides d'ondes d'entree/sortie varie a travers le deuxieme groupe (10), de maniere a augmenter l'uniformite d'au moins un parametre de performance, par exemple, echo magnetique contigu (AXT). Dans le mode de realisation decrit, la largeur (W) des extremites decroissantes du guide d'ondes augmente depuis un cote du groupe de guides d'ondes d'entree/sortie (10) jusqu&#3...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Equalisation of Spectral Non-Uniformities in Broad-Band Chirped Fibre Gratings

Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides: Applications and Fundamentals

The use of chirped fibre Bragg gratings (FBGs) in a dispersion compensating role has been shown t... more The use of chirped fibre Bragg gratings (FBGs) in a dispersion compensating role has been shown to be a successful technology with great promise for future network upgrades [1,2]. A natural consequence of using FBGs in a negative dispersion sense is that although the structure is designed to phase-match forward- and backward-propagating LP01 modes, the phase-matching condition for coupling from the forward propagating fundamental mode to a higher order cladding-mode is also met for wavelengths just below that of the fundamental Bragg reflection. Because propagation in cladding-modes is extremely lossy there is a significant out-coupling of this shorter wavelength light. The chirped nature of FBGs designed for broad-band (> 5 nm) dispersion compensation means that this cladding-mode loss is integrated along the length of the grating with the result that the reflection spectrum has a slope extending from the short wavelength edge of the useable bandwidth. In a practical transmissio...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Design of apodised linearly-chirped fibre gratings for optical communications

The dispersion characteristics of hepatised linearly-chirped fibre gratings have been studied sys... more The dispersion characteristics of hepatised linearly-chirped fibre gratings have been studied systematically. It is shown that the hyperbolic tangent profile results in an overall superior performance, as it provides highly linearised time-delay characteristics with minimum reduction in the linear dispersion. To compensate for the linear dispersion of 100 km of standard telecom fibre over certain bandwidth (in nm), the required grating length is 19.24 cm/nm.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Short-wavelength, transmission-loss suppression in Fibre Bragg Gratings

StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission loss... more StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission losses in standard FBG's. We show that short wavelength, transmission losses can be practically eliminated by damping the resonant excitation of the cladding modes. The damping is achieved by properly introducing a substantial propagation loss into the cladding modes. For maximum effect, the core mode should experience no extra propagation losses. By applying a thin lossy layer on the fibre cladding surface, a reduction of cladding-mode- losses of about 12dB was achieved. Transmission-loss suppression The cladding mode attenuation can be easily achieved by depositing a thin lossy layer on the cladding surface. Alternatively, the same effect can be accomplished by introducing one or more lossy layers into the fibre cladding during the fabrication process. The latter will result in a stronger cladding-modellossy-material overlap and, therefore, produce higher propagation losses.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Short-wavelength, transmission-loss suppression in Fibre Bragg Gratings

StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission loss... more StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission losses in standard FBG's. We show that short wavelength, transmission losses can be practically eliminated by damping the resonant excitation of the cladding modes. The damping is achieved by properly introducing a substantial propagation loss into the cladding modes. For maximum effect, the core mode should experience no extra propagation losses. By applying a thin lossy layer on the fibre cladding surface, a reduction of cladding-mode- losses of about 12dB was achieved. Transmission-loss suppression The cladding mode attenuation can be easily achieved by depositing a thin lossy layer on the cladding surface. Alternatively, the same effect can be accomplished by introducing one or more lossy layers into the fibre cladding during the fabrication process. The latter will result in a stronger cladding-modellossy-material overlap and, therefore, produce higher propagation losses.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Short-wavelength, transmission-loss suppression in Fibre Bragg Gratings

StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission loss... more StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission losses in standard FBG's. We show that short wavelength, transmission losses can be practically eliminated by damping the resonant excitation of the cladding modes. The damping is achieved by properly introducing a substantial propagation loss into the cladding modes. For maximum effect, the core mode should experience no extra propagation losses. By applying a thin lossy layer on the fibre cladding surface, a reduction of cladding-mode- losses of about 12dB was achieved. Transmission-loss suppression The cladding mode attenuation can be easily achieved by depositing a thin lossy layer on the cladding surface. Alternatively, the same effect can be accomplished by introducing one or more lossy layers into the fibre cladding during the fabrication process. The latter will result in a stronger cladding-modellossy-material overlap and, therefore, produce higher propagation losses.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Electric current sensors employing spun highly birefringent optical fibers

Journal of Lightwave Technology, 1989

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 2×2 fused fiber null couplers with asymmetric waist cross sections for polarization independent (>0.01 dB) switching

Journal of Lightwave Technology, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The effect of four-wave mixing in fibers on optical frequency-division multiplexed systems

Journal of Lightwave Technology, 1990

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Chirped moire fiber gratings operating on two-wavelength channels for use as dual-channel dispersion compensators

IEEE Photonics Technology Letters, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Sinc-sampled fiber Bragg gratings for identical multiple wavelength operation

IEEE Photonics Technology Letters, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Rayleigh scattering effect on the gain efficiency and noise of erbium-doped fiber amplifiers

IEEE Journal of Quantum Electronics, 1995

... Richard I. Laming was bom in Sheffield, England. on March 12, 1962. He received a first ... h... more ... Richard I. Laming was bom in Sheffield, England. on March 12, 1962. He received a first ... hundred publications. In 1988 and 1990, he was awarded the Pirelli and Senior Pirelli Research Fellowships respectively. In October ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optimization of apodized linearly chirped fiber gratings for optical communications

IEEE Journal of Quantum Electronics, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of United States Patent ( 19 ) Payne et al . 54 ERBIUM-DOPED FIBRE AMPLIFIER WITH SHAPEID SPECTRAL GAIN 75 Inventors

3.988,697 10/1976 Cooley . 4,143,332 3/1979 Michan et al. ....................... 330/4.3 4.551,6... more 3.988,697 10/1976 Cooley . 4,143,332 3/1979 Michan et al. ....................... 330/4.3 4.551,684 1 1/1985 Bernhardt ............................ 330/4.3 4,794,346 2/1988 Miller ................................... 330/4.3 4,938,556 7/1990 Digannett et al. .................. 330/4.3 4,947,134 8/1990 Olsson .................................. 330/.43 4,955,025 9/1990 Mears et al. ............................ 372/6 5,067,789 1 1/1991 Hall et al. ............................. 385/27

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Optical power monitor

Bookmarks Related papers MentionsView impact

Research paper thumbnail of l E. Ronnekleiv is a Ph.D. student on leave from the NTNU university in Norway. He is employed and sponsored by Optoplan AS, Norway

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Performance limits of erbium-doped-fiber amplifiers due to internal Rayleigh backscattering

Conference on Optical Fiber Communication/International Conference on Integrated Optics and Optical Fiber Communication, 1993

Bookmarks Related papers MentionsView impact

Research paper thumbnail of <title>Current Monitor Using Elliptical Birefringent Fibre And Active Temperature Compensation</title>

Fiber Optic Sensors II, 1987

Bookmarks Related papers MentionsView impact