Apparatus And Method For Measuring Chirp In Fiber Optical Transmitters

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Apparatus And Method For Measuring Chirp In Fiber Optical Transmitters

This abstract first appeared for US patent application 18218411 titled 'Apparatus And Method For Measuring Chirp In Fiber Optical Transmitters

Original Abstract Submitted

Methods and apparatus for monitoring chirp in a modulated light beam. The modulated light is passed through a variable dispersion element or “VDE”, and the light from the variable dispersion element is detected to yield a signal. A parameter which represents the strength of modulation in the light after passage through the VDE such as the peak intensity of the modulated light is measured as the VDE is controlled to vary the applied dispersion. The chip is determined from the variation of the parameter with dispersion, such as from the dispersions at which the parameter is at minima. The method can be applied to beams modulated by common digital transmitters used in optical communication systems.