mario martinelli | Politecnico di Milano (original) (raw)

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Papers by mario martinelli

IEEE Photonics Technology Letters, 2000

Photonic Network Communications, 2002

This paper is an introduction to survivability of WDM networks. All the main optical protection t... more This paper is an introduction to survivability of WDM networks. All the main optical protection techniques proposed as far as now for the WDM layer are classified and reviewed. In particular, commonly adopted protection strategies for ring and mesh networks are explained. Moreover, off-line planning of WDM networks able to support path protection is briefly introduced. Finally, an example of heuristic network-capacity optimization is presented, discussing results obtained by considering a case-study network.

IEEE/OSA Journal of Lightwave Technology, 2000

Optics Letters, 1993

The measurement of the electric current with an optical fiber sensor can be made insensitive to e... more The measurement of the electric current with an optical fiber sensor can be made insensitive to external vibrations that act on the leading fiber by using a circuit involving a mirrored Faraday rotator and a highly twisted low-birefringence fiber. A description of the optical ...

Optics Letters, 1991

A novel scheme is proposed in which the presence of a Faraday rotator in a retracing fiber-optic ... more A novel scheme is proposed in which the presence of a Faraday rotator in a retracing fiber-optic circuit allows the complete, passive, and universal compensation of any birefringence (reciprocal) change occurring in the fiber. The action of the scheme was experimentally tested by inducing thermal and mechanical perturbations on a fiber coil. The results confirm the theoretical expectations and compensating for unwanted birefringence effects.

Optical and Quantum Electronics, 2003

The linear and nonlinear characteristics of optical slow-wave structures made of direct coupled F... more The linear and nonlinear characteristics of optical slow-wave structures made of direct coupled Fabry–Pérot and Ring Resonators are discussed. The main properties of an infinitely long slow-wave structure are derived analytically with an approach based on the Bloch theory. The spectral behaviour is periodical and closed form expressions for the bandwidth, the group velocity, the dispersion and the linear and nonlinear induced phase shift are derived. For structures of finite length the results still hold providing that proper input/output matching sections are added. In slow-wave structures most of the propagation parameters are enhanced by a factor S called the slowing ratio. In particular nonlinearities result strongly enhanced by the resonant propagation, so that slow-wave structures are likely to become a key point for all-optical processing devices. A numerical simulator has been implemented and several numerical examples of propagation are discussed. It is also shown as soliton propagation is supported by slow-wave structures, demonstrating the flexibility and potentiality of these structures in the field of the all-optical processing.