MMF

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Efficient multi-mode fiber to single-mode fiber coupling : High speed VCSEL characterization

This article aims at illustrating the MMF to SMF coupling using a multimode scrambler, as introduced in a previous article, to couple a Vertical Cavity Surface Emitting Diode Laser (VCSEL) laser into a ZOOM Spectra high resolution Laser Spectrum Analyzer. Indeed, VCSEL laser are really compact semiconductors laser diodes with large Numerical Aperture emission beam perpendicular to their top surface, as illustrated figure 1. VCSEL are generally fabricated by batch of millions units on a wafer using standard semiconductor technologies….

integrating_sphere

Efficient multi-mode fiber to single-mode fiber coupling: comparison between the existing solutions

As described in a previous article, achieving an efficient light coupling from multimode fiber (MMF) to single mode fiber (SMF) is a difficult task, especially when trying to avoid any spectral losses while keeping an acceptable power conversion. The fiber to fiber coupling option, as well as the tapered fiber solution and the lenses system being discarded, other alternatives coupling systems have to be investigated. In the following article, the most common coupling setup, the integrating sphere as well as…