We demonstrate a highly efficient in-fiber out-coupling device. The core mode is coupled to the cladding by a tilted fiber Bragg grating and then the cladding mode is out-coupled from the optical fiber through V-grooved cladding. The light emitting characteristics are investigated experimentally and a maximum out-coupling efficiency of 54.8% is obtained.
The cladding mode generated by the tilted fiber Bragg grating is out-coupled to optical power detector by the total internal reflection at the micro-etched cladding. Optimization of the tilted fiber Bragg grating and micro-etched cladding for high efficient out-coupling of cladding mode was discussed theoretically. Over 32 % power of the cladding mode is out-coupled by the micro-etched cladding. In addition, as much as 90 % power of the input power is experimentally detected using the avalanche photodiode.
Tilted fiber Bragg grating can couple light both to backward propagating core modes and cladding modes. We propose a WDM receiving device with high cladding and/or radiation mode coupling efficiency using etched cladding parts and tilted Fiber Bragg gratings(TFBGs) which are key components for doing wavelength selective operations. Each channel exhibits the cladding and radiation mode coupling efficiency of approximately 20%.
A novel fiber-in-line optical transceiver structure by focusing the outgoing radiation from a tilted and chirped fiber Bragg grating is proposed. The chirped gratings with 45° tilted angle is designed for an optimum input coupling at 1.55 μm and a FDTD method is used for analysis. Experimental results on beam focusing are shown. We expect this novel design can be used for a low-cost receiver in the bi-directional fiber-in-line optical transceiver.
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