M.J. Creaner
BT Group
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Featured researches published by M.J. Creaner.
Components for Fiber Optic Applications III and Coherent Lightwave Communications | 1989
R.C. Steele; M.J. Creaner; G.R. Walker; N.G. Walker
The successful application of an endless polarisation control scheme was demonstrated by its use in a high sensitivity PSK heterodyne optical communication system. The synchronous demodulation of PSK signals was investigated and the practical implementation of a phase locked loop which is able to track the phase noise of optical signals is discussed. A large loop bandwidth is shown to be necessary and a loop filter of modified first order type was found to have advantages over a second order type. A synchronous demodulation system not using a phase locked loop is also proposed.
IEEE Photonics Technology Letters | 1989
Timothy J. Whitley; M.J. Creaner; R.C. Steele; M.C. Brain; C.A. Millar
A laser-diode-pumped erbium-doped fiber amplifier, exhibiting 9-dB gain, has been operated as an in-line optical repeater in a 565-Mb/s coherent optical communications system. A sensitivity penalty of 0.4 dB was observed when the amplifier was positioned 35 dB away from the receiver, thus indicating a system improvement of 8.6 dB. By progressively reducing the coupling loss between amplifier and receiver, the noise figure of the contradirectionally pumped amplifier was calculated to be 5.4 dB, a value which is consistent with simple noise theory.<<ETX>>
global communications conference | 1990
M.C. Brain; M.J. Creaner; R.C. Steele; D.M. Spirit; N.G. Walker; G.R. Walker; J. Mellis; S. Al-Chalabi; W. Hale; I. Sturgess; M. Rutherford; D. Trivett
A series of field experiments performed with two-wavelength transmissions at 622 Mb/s over 200-km of installed single-mode fiber using a diode-pumped erbium-doped fiber amplifier repeater are described. Both differential phase-shift keying (DPSK) modulation and frequency-shift keying (FSK) modulation were employed, along with two implementations of automated endless polarization control. In a further field experiment, a power budget of 64 dB was demonstrated in the form of repeaterless DPSK transmission at 622 Mb/s over 264 km of installed fiber. The use of such a large power budget to accommodate the sharing of power between many wavelength channels and the accumulation of spontaneous emission noise through cascaded optical amplifier repeaters is discussed.<<ETX>>
Electronics Letters | 1990
M.J. Creaner; D.M. Spirit; G.R. Walker; N.G. Walker; R.C. Steele; J. Mellis; S. Al Chalabi; W. Hale; I. Sturgess; M. Rutherford; D. Trivett; M.C. Brain
Electronics Letters | 1988
M.J. Creaner; R.C. Steele; I.W. Marshall; G.R. Walker; N.G. Walker; J. Mellis; S. Al Chalabi; I. Sturgess; M. Rutherford; J. Davidson; M.C. Brain
Electronics Letters | 1989
R.C. Steele; M.J. Creaner
Electronics Letters | 1989
D.J. Malyon; R.C. Steele; M.J. Creaner; M.C. Brain; W.A. Stallard
Electronics Letters | 1988
M.J. Creaner; R.C. Steele; G.R. Walker; N.G. Walker
Electronics Letters | 1989
P.P. Smith; A.A. Sayles; N.R. Back; A.P. McDonna; M.J. Creaner
optical fiber communication conference | 1989
M.J. Creaner; R.C. Steele; I.W. Marshall; G.R. Walker; N.G. Walker; J. Mellis; S. Al Chalabi; J. Davidson; I. Sturgess; P. Cochrane
