Abstract: Spliced end portions (30--30) of two optical fibers are recoated in a manner which results in the cross section of the spliced length of fiber transverse to a longitudinal axis thereof being substantially constant. This is accomplished without compromising the adhesion of a curable recoating material (51) to an adjacent original coating material (38). In order to provide such a recoated portion, original coating material which is removed to permit splicing is removed in such a manner as to leave a tapered portion (52) remaining on the end portion of each optical fiber. As a result, the interface between the recoating material and the original coating material is increased sufficiently to avoid having to overlap some of the recoating material with original coating material on adjacent portions of the fibers being spliced.

Abstract: Spliced end portions (30--30) of two optical fibers are recoated in a manner which results in the cross section of the spliced length of fiber transverse to a longitudinal axis thereof being substantially constant. This is accomplished without compromising the adhesion of a curable recoating material (51) to an adjacent original coating material (38). In order to provide such a recoated portion, original coating material which is removed to permit splicing is removed in such a manner as to leave a tapered portion (52) remaining on the end portion of each optical fiber. As a result, the interface between the recoating material and the original coating material is increased sufficiently to avoid having to overlap some of the recoating material with original coating material on adjacent portions of the fibers being spliced.

Abstract: In a digital device having an input thereto comprising a digital sample stream at a frequency F, a method for employing a component therein designed to work at a frequency less than F. The method in general comprises the steps of, dividing the digital sample stream into odd and even digital sample streams each at a frequency of F/2; passing one of the digital sample streams through the component designed to work at a frequency less than F wherein said component responds only to the odd or even digital samples in the one of the digital sample streams; delaying the other of the digital sample streams for the time it takes the one of the digital sample streams to pass through the component; and, adding the one of the digital sample streams after passing through the component with the delayed other of the digital sample streams.

Abstract: Spliced end portions (30-30) of two optical fibers are recoated in a manner hich results in the cross section of the spliced length of fiber transverse to a longitudinal axis thereof being substantially constant. This is accomplished without compromising the adhesion of a curable recoating material (51) to an adjacent original coating material (38). In order to provide such a recoated portion, original coating material which is removed to permit splicing is removed in such a manner as to leave a tapered portion (52) remaining on the end portion of each optical fiber. As a result, the interface between the recoating material and the original coating material is increased sufficiently to avoid having to overlap some of the recoating material with original coating material on adjacent portions of the fibers being spliced.

Abstract: A digital phase-lock loop (DPLL) which generates a signal with a phase that approximates the phase of a received signal with a linear estimator. The effect of a complication associated with non-zero transport delays related to DPLL mechanization is then compensated by a predictor. The estimator provides recursive estimates of phase, frequency, and higher order derivatives, while the predictor compensates for transport lag inherent in the loop.

Abstract: A GPS receiver having a number of channels, one for each of a plurality of satellites, receives an aggregate of pseudorange code time division modulated signals from some or all satellites and converts the aggregate to baseband and then to digital form for separate processing in the separate channels, each of which includes a complex mixer for adjustment of the baseband signal to a smooth estimate of frequency, .omega., for the next measurement interval, and an N-lag cross correlator which receives a replica of the pseudorange code adjusted for a smoothed estimate of the pseudorange (delay), .tau.. A fast Fourier transform processor computes the signal energy as a function of Doppler frequency for each correlation lag, and a range and frequency estimator computes estimates of pseudorange, .tau., and frequency, .omega..