Far-field radiation and modal dispersion of 1310 nm dispersion-optimized fiber at 850 nm

Abstract

Far-field radiation pattern measurements have been used to evaluate the modal structure and dispersion associated with 0.85-pm wavelength light launched from high-brightness light emitting diodes (LED's) into TIA Class IVa fiber. The measured far-field radiation pattern of the light intensity emitted from the end of the optical fiber is compared to the far-field radiation pattern calculated from the Fraunhofer approximation to the diffraction integral with the result that two linearly polarized (LP) modes propagate in the optical fiber and that the optical power is nearly equally distributed between the two modes. The modal dispersion associated with the use of a 0.85-pm wavelength emitter and a TIA Class IVa fiber is evaluated to be 2.3 ns/km, which is adequate for a variety of local-area networks and point-to-point optical communications links.

Far-Field Emission Patterns of Nanowire Light-Emitting Diodes

“…From the results in Figure , NWs with diameter d = 200–290 support a few guided modes, for instance, HE 11 , TM 01 , and TE 01 modes, in our wavelength range of interest (800–950 nm). The lowest order mode, HE 11 , which has no cutoff frequency, has a maximum field intensity at its center and is known to exhibit maximum intensity for FF at θ = 0 . On the other hand, higher order modes, such as TM 0 n , TE 0 n , and HE mn (with m ≥ 2), have a node at the center in their EM field distributions.…”

“…The lowest order mode, HE 11 , which has no cutoff frequency, has a maximum field intensity at its center and is known to exhibit maximum intensity for FF at θ = 0. 24 On the other hand, higher order modes, such as TM 0n , TE 0n , and HE mn (with m ≥ 2), have a node at the center in their EM field distributions. Thus, these higher modes show minimal intensity at θ = 0 in the FF.…”

“…These mode-dependent FF patterns for the edge emission have already been reported in cylindrical waveguides. 16,24 The FF pattern is a superposition of each mode, and the emission from the sidewall gives an additional contribution to the pattern. These are thought to result in the position of the maximum FF intensity being slightly apart from the direction θ = 0.…”

Experimental demonstration of a transient grating controlled all-optical switch

“…In conventional nonlinear FWM interactions, the wavelength conversion can be achieved by providing the required phase-matching condition in Kerr media via dispersion compensation. However, it was shown that phase-mismatch switching enhances wavelength conversion [22]. In this method, one can vary the medium periodically along the propagation path to obtain quasi-phase-matching (QPM) [22,23] and provide efficient wavelength conversion.…”

“…However, it was shown that phase-mismatch switching enhances wavelength conversion [22]. In this method, one can vary the medium periodically along the propagation path to obtain quasi-phase-matching (QPM) [22,23] and provide efficient wavelength conversion. Quantum optical treatment of FWM shows that the phase matching requirement can be expressed in a more general form by an overlap integral of spectral envelopes as in [26].…”