In this paper, the model and implementation of an optical transmission system using a multi‐longitudinal mode optical source and a dispersive optical channel are described. Such a system exhibits multi‐bandpass transmission windows, as a result of a combination of the wideband optical spectrum and chromatic dispersion on the optical channel. As shown in this paper, the band‐pass windows are centered at frequencies that depend on the spectral free range of the optical source and optical channel length. In the telecommunications domain, band‐pass transmission windows can be used for multiplexing analog and/or digital signals, as an alternative way for transmitting baseband and modulated subcarriers, through optical‐fiber links. To show such a potential application, the multiplexed transmission of two microwave signals, using two adjacent band‐pass windows, is also described in this paper. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 36: 202–206, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10720

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We propose a new method for tuning an Er3+-doped continuous-wave fiber-ring laser. We present a novel numerical model and confirm the model with experimental results. The numerical model relies on the implementation of the analytical solution of signal propagation over small (elemental) segments of amplifier fiber rather than using the usual Runge-Kutta algorithm. The validity of the model is verified by the good agreement between computer results and experimental data. Experiments demonstrating a 11.2-nm wavelength tuning range have been conducted using an electrooptic intracavity filter composed of two cascaded unbalanced Mach-Zehnder interferometers (MZIs) integrated in lithium niobate, The numerical analysis shows that the tuning range obtained is limited by the combination of gain shape and filter characteristics. Increased tuning range can be obtained by decreasing losses or by using a more selective filter

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