The authors have realized a novel wavelength division multiplexer/demultiplexer based on rib waveguides in GaInAsP/InP. The device is a strongly asymmetric codirectional coupler with periodic variation of the coupling constant and has sinc2-type characteristics. Their devices have center wavelengths around 1.3 mu m, filter half-widths 10-15 nm, and far end isolation down to -17 dB. The structure is suited for integration into optoelectronic integrated circuits for applications in bidirectional optical communication systems
I n h a l t s i i b e r s i c h t . Es wird die Anderung des Intensitiitsmaximums eines in einem Ringresonator umlaufenden Impulses untersucht. Der Reaonator enthiilt einen Iangsamen siittigbrtren Absorber und einen nichtlinearen Farbstoffverstiirker. Die Impulsliinge sei klein im Vergleich rnit den longitudinalen aber vie1 groBer als die transversalen Relaxationszeiten von Absorber und Verstiirker. Die Abhiingigkeit dea Impulsmaximums von der Umlaufzahl wird insbesondere fiir die Fiille angegeben, daB es sich bei dem Anfangsimpuls urn einen GauB-, sech-oder Lorentzimpuls handel t.Znr Herleitung der Formeln werden die Anfangimpulse nach stetionken Losungen des zugrundeliegeliden Gleichungesystems zerlegt.Die gemonnenen Ergebnisse werden mit den von einem Rechenautomaten erhaltenen verglichen.A b s t r a c t . The change of the intensity maximum of a pulse tripping round in a triangular resonator is investigated. The resonator contains a slow saturable absorber and a nonlinear dye amplifier. The pulse width is small compared to the longitudinal but much greater than the transversnl relnsation times of absorber and amplifier. Especially the dependence of the pulse maximum on the niiruber of round trips is given for the case that the initial pulse haa a Gaussian, a secant hyperb9lic. or a Lorentzian shape. To get the formulae the original pulses are decomposed to steadystate solutions of the basic equations.The results are compared with computer solutions.
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