Numerous spectroscopic applications need more than a simple optical fiber patch cord. Therefore, fiber optic bundles are considered to be the most suitable when it is necessary to measure different simultaneously or those that need an improved signal to noise ratio (as in the case of weak signals).
To be more precise, a fiber optic bundle is regarded as any fiber optic assembly that contains more than one optical fiber in a single fiber cable. For instance, a bifurcated optical fiber assembly is the most standard example of a fiber bundle. Such a fiber optic bundle is used to split a signal or to combine signals.
Fiber optic applications include those that direct light from a sample into two various spectrometers. Fiber optic bundles are generally applied to enlarge the spectral coverage of the measurement, either to keep a higher resolution or to cover an extended range.
Herewith, such kinds of optical fibers can also be employed to transmit the signal from several samples into the same spectrometer. Therefore, just one sample allows emitting light at a time when applying a bifurcated optical fiber, or special attention should be paid to be sure the signals do not have spectral overlap.
It should be noted that the same operating principle and fiber optic applications can be enlarged up to trifurcated and quadfurcated optical fiber assemblies as well. Another fiber optic bundle is called a “round to slit” configuration. The design of the fiber bundle includes numerous tiny core optical fibers that are installed into one “fiber assembly with fibers bundled tightly in a circular fashion on one end and stacked linearly on top of each other on the other end.”
Nevertheless, it is required to take into consideration two crucial details when applying an optical fiber assembly with a slit configuration. Cylindrical lens are applied to prevent the majority of the light to be imaged above and below the detector resulting in various advantages from the optical fiber stacking.
Moreover, it is required to align the fiber optic stack to the entrance slit that can be performed by shining light into the round end of the assembly and controlling the signal as the optical fiber is rotated in the connection port. Herein, in the case when the peak signal is reached, the optical fiber is screwed down to lock the position. Such fiber optic bundles are usually used for NIR transmission spectroscopy (it has few photons and photon energy is extremely low).
Finally, the combination of different combinations of single, round, and stacked configurations with regular, bifurcated, trifurcated, and quadfurcated optical fiber assemblies open countless options affordable to suit any application. Herewith, fiber optic bundles can be used with different optomechanical tools to develop more specific applications.
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