Contributing Institutions:Politecnico di Torino (PoliTO)
Summary: This application note deals with the way we measure the phase noise of laser sources. It is motivated by the fact that there are different methods to measure the phase noise variance and several ways to interpret it, often leading to varying results. We show how the traditional method, based on the interferometer technique and on the electrical spectrum analyzer instrument, can overestimate the phase noise variance. We present a systematic method that fully characterizes laser phase noise using a digital receiver, and in agreement with K. KIKUCHI and K. IGARASHI  , we find that the 3>dB linewidth of distributed feedback (DFB) semiconductor lasers has a strong dependence on the measurement time.
Contributing Institutions: Scuola Sant'Anna (SSSUP), Universidad Politecnica de Valencia (UPVLC).
Summary: This Application Note describes how to generate RF signals up to 50GHz starting from a fiber-mode-locked laser. Optimization of the filter design to be used together with a mode-locked laser at 400MHz is investigated, as well as the evaluation of the amplitude and phase-noise stability of the generated carriers and system tunability.
Contributing Institutions:Fraunhofer Institute for Telecommunications, Heinrich Hertz Institut.
Summary: This application note describes a dynamic pump-probe configuration, which enables to measure simultaneously both the gain and the phase dynamics of a device under test, which can for example be a semiconductor optical amplifier.
Summary: This application note provides a detailed description of measurement procedure of the main characteristics of the EDFAs as mainly the signal gain and the noise characteristics as the optical-to-signal-noise-ratio (OSNR).
Summary: This application note provides a detailed description of the experimental set-up and the methodology required for the proper characterization of the static and dynamic wavelength emission and wavelength switching of tuneable lasers.
Summary: High speed Burst mode ONU in next generation PONs requires high speed reflective semiconductor amplifiers (RSOA) for providing a cost?effective solution for the usually requested colourless ONUs. The objective of this application note is to provide a detailed description of the gain and noise figure characterization of SOA and RSOA.
Contributing Institutions: INSTITUT TELECOM/TELECOM PARISTECH
Summary: This application note covers both frequency-domain and time-domain measurement techniques for accessing the frequency chirp of an optical signal. The details of small-signal modulation chirp measurement using dispersion fibre and vector network analyser and Time-Resolved Chirp (TRC) measurements using the frequency discriminator based Maintaining Polarisation fibre Interferometer are described.
Contributing Institutions: Universidad Politécnica de Valencia (UPVLC)
Summary: This application note describes how carbon nanotubes-coated fibers can be prepared, and the ultrafast characterization of their optical nonlinearities.
Contributing Institutions: Fraunhofer Institute for Telecommunications Heinrich Hertz Institute, Photonics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology
Summary: This application note describes a method to characterize the gain dependence of a four-mode phase-sensitive amplifier on the individual phases of the six interacting waves.