The 735383-A001 and A002 are unique adapters that reduce the numerical aperture (NA) of an optical fiber to half and is only applicable to the free space optical input structure on the Yokogawa AQ6370 series optical spectrum analyzers.
What is meant by 'numerical aperture?' The numerical aperture is the range of angles at which an optical fiber can transmit its beam. It's related to refraction and the beam spread angle.
Numerical Aperture (NA)=n×sin(µ) or n×sin(α)
Applicable fiber: Multimode fiber (GI50/125µm and GI62.5/125µm)
NA Conversion Adapter
Free Space input of AQ6370 Series
The NA Conversion Adapter halves the numerical aperture (NA) of a connected fiber.
|Better dynamic range (SNR) for passive component testing|
|The use of a multimode fiber causes a high coupling loss with a broadband light source so that high output power cannot be expected, and the direct output of such a fiber is reduced in the Monochromator due to the NA restriction.
By attaching the adapter to the end of a multimode fiber, the optical spectral level of a broad band source increases about 5 dB on the OSA.
|Better level stability for active device testing|
|With the direct output of multimode fiber, there are cases where the measured power level becomes unstable due to dynamic speckle noise caused by modal interference.
The NA conversion adapter can resolve the above issue and improves the level measurement stability by efficiently coupling the output beam with the Monochromator.
|• Level Fluctuation||• Ripple on LED Spectrum|
|DFB-LD Spectrum (GI 50/125 µm)||EE-LED Spectrum (GI 50/125 µm)|
|Applicable Fiber||SMF, GI50/125um||SMF, GI50/125um, GI62.5/125um
|Wavelength Range||350 to 1700nm (typ.)|
|NA Conversion Ratio||Approx. 1/2|
|Applicable OSA Models||AQ6370 series Optical Spectrum Analyzers
Note: the wavelength restriction applies to the AQ6375
|Note: Wavelength resolution doubles when the NA conversion adapter is used.|
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