We demonstrate two types of all-fiber speckle spectrometer. One of the spectrometers is composed by cascading a coreless fiber (CLF) and an all-solid photonic crystal fiber (PCF). Using a 10 cm-long fiber with 20-segment-PCF spliced elements, the spectrometer achieves a resolution of 0.03 nm over a bandwidth from 1540 to 1560 nm. The other spectrometer is realized by using the periodically tapered CLF. A remarkable spectral resolution of 0.03 nm in the near-infrared spectrum can be achieved with a 5-cm long fiber. Our compact spectrometers based on CLF promise picometer-resolution spectroscopy in portable applications, providing a new way for miniature spectrometer systems.
Microfabrication of microstructures on the end of an optical fiber is a challenge. A double-interferometer cascaded sensor on the end face of a dual-core fiber is demonstrated to measure the refractive index and temperature. The Michelson interferometer consists of two cores of dual-core fiber, where one core is spliced with a flat-topped microtip, and the Fabry-Perot interferometer is constructed based on an epoxy resin microcap. The fabricated sample achieved a refractive index sensitivity of -14880 nm/RIU and a temperature sensitivity of -374.2 pm/℃. The optical fiber tip microlaboratory has a robust structure and low manufacturing cost.
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