Fiber adaptor improves optical input of spectrum analysers - Embedded.com

Fiber adaptor improves optical input of spectrum analysers

An adaptor for use with the Yokogawa AQ6370 series of optical spectrum analyzers (OSAs) is designed to enhance the sensitivity, dynamic range and level stability by reducing the divergence of light emitted from the input fibre and increasing the input signal to the OSA by 5 dB.

The light that is emitted from an optical fiber is divergent, and under normal conditions the limited size of the optics inside the OSA monochromator results in divergent light being blocked, and hence unable to contribute to a strong optical signal.

Using the fiber NA adaptor on a GI50/125 multi-mode fibre results in the fiber’s numerical aperture (NA) value being divided by two. The reduction in divergence of the optical input increases the monochromator optical throughput, producing a 5 dB (factor 3) increase in signal strength.

The result of this enhancement in performance is better dynamic range in passive component testing and better level stability in active device
testing.

The Yokogawa AQ6370 series of optical spectrum analyzers cover the wavelength range from 350 to 2400 nm and are applicable to both single-mode and multimode fibers. They provide wavelength accuracy of ±0.01 nm, wavelength resolution of 0.02 nm, ultra-high dynamic range of 78 dB (typical),  level range of -90 dBm, and sweep speed of 0.2 sec/100nm.

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