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Femtosecond Laser Application to PLC Optical Devices and Packaging
Ik-Bu Sohn, Man-Seop Lee, and Sang-Man Lee
Abstract :	Using tightly focused femtosecond laser pulses, we produce an optical waveguide and devices in transparent materials. This technique has the potential to generate not only channel waveguides, but also three-dimensional optical devices. In this paper, an optical splitter and U-grooves, which are used for fiber alignment, are simultaneously fabricated in a fused silica glass using near-IR femtosecond laser pulses. The fiber- aligned optical splitter has a low insertion loss, less than 4 dB, including an intrinsic splitting loss of 3 dB and excess loss due to the passive alignment of a single-mode fiber. Finally, we present an output field pattern, demonstrating that the splitting ratio of the optical splitter becomes approximately 1:1.
Key word :	Femtosecond laser processing, waveguide writing, PLC optical splitter, passive alignment.
DOI :	http://dx.doi.org/10.4218/etrij.05.0204.0060
Cite this :	Ik-Bu Sohn, Man-Seop Lee, and Sang-Man Lee, "Femtosecond Laser Application to PLC Optical Devices and Packaging," ETRI Journal, vol. 27, no. 4, Aug. 2005, pp. 446-448. http://dx.doi.org/10.4218/etrij.05.0204.0060
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