Design of a single-mode tapered waveguide for low-loss chip-to-fiber coupling

Mitomi, O.; Kasaya, K.; Miyazawa, H.

doi:10.1109/3.301643

Cited by 97 publications

(37 citation statements)

References 16 publications

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“…The fiber is self-aligned in a Si V-groove (Fig. 1), secured with epoxy, and butt-coupled to a mode-matched Si 3 N 4 waveguide, which adiabatically widens [11,12,13,14] to match the width of the zipper cavity nanobeam. The waveguide then couples to the cavity through a truncated photonic crystal mirror.…”

Section: Single-sided Fiber Couplingmentioning

confidence: 99%

Optical coupling to nanoscale optomechanical cavities for near quantum-limited motion transduction

Cohen¹,

Meenehan²,

Painter³

2013

Opt. Express

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A significant challenge in the development of chip-scale cavityoptomechanical devices as testbeds for quantum experiments and classical metrology lies in the coupling of light from nanoscale optical mode volumes to conventional optical components such as lenses and fibers. In this work we demonstrate a high-efficiency, single-sided fiber-optic coupling platform for optomechanical cavities. By utilizing an adiabatic waveguide taper to transform a single optical mode between a photonic crystal zipper cavity and a permanently mounted fiber, we achieve a collection efficiency for intracavity photons of 52% at the cavity resonance wavelength of λ ≈ 1538 nm. An optical balanced homodyne measurement of the displacement fluctuations of the fundamental in-plane mechanical resonance at 3.3 MHz reveals that the imprecision noise floor lies a factor of 2.8 above the standard quantum limit (SQL) for continuous position measurement, with a predicted total added noise of 1.4 phonons at the optimal probe power. The combination of extremely low measurement noise and robust fiber alignment presents significant progress towards single-phonon sensitivity for these sorts of integrated micro-optomechanical cavities.

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Section: Single-sided Fiber Couplingmentioning

confidence: 99%

Optical coupling to nanoscale optomechanical cavities for near quantum-limited motion transduction

Cohen¹,

Meenehan²,

Painter³

2013

Opt. Express

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“…Recent progress in the design of adiabatic and tapered transitions [20][21][22] between standard index-guided waveguides and PC waveguides has improved the theoretical efficiency of end-fire coupling schemes. However, because many of the applications and advantages of planar PCs are seen in the integration and miniaturization of components, the long adiabatic transitions from high-index index-guided waveguides with relatively small mode sizes to weakly guided fiber-sized modes that are required to interface with fiber optics 23 are not desirable. Out-of-plane coupling schemes have also been studied, 24 but they currently suffer from high loss and a relatively high complexity.…”

Section: Introductionmentioning

confidence: 99%

Design of photonic crystal waveguides for evanescent coupling to optical fiber tapers and integration with high-Q cavities

2003

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We describe a novel scheme based on evanescent guided-wave coupling for optically interfacing between conventional fiber-optic and planar photonic crystal devices such as waveguides and resonant cavities. By considering the band structure of bulk photonic crystal slabs, we analyze the k space properties of a linear defect waveguide and establish a set of design rules to ensure efficient evanescent coupling with optical fiber tapers. These rules are used to design a waveguide in a square-lattice photonic crystal. The coupling efficiency is calculated with a coupled-mode theory incorporating the finite-difference time-domain-calculated uncoupled modes of the fiber taper and photonic crystal waveguide. On the basis of this coupled-mode theory, 95% power transfer from the fiber taper to the photonic crystal waveguide is possible over a coupling length of 80 lattice periods and with a bandwidth of 1.5% of the center wavelength. The integration of this waveguide with a photonic crystal defect resonant cavity is also presented, thus showing the usefulness of the combined fiber taper and photonic crystal waveguide system for efficient, optical fiber-based probing of optical elements based on planar photonic crystal technologies.

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“…A laser diode integrated with a spot-size converter is much more attractive for low-cost packaging due to its large spot-size, which is well matched to that of a singlemode fiber [5]. Three main classes of spot-size converter have been developed to expand the optical mode.…”

Section: Introductionmentioning

confidence: 99%

New horizontal frustum optical waveguide fabrication using UV proximity printing

et al. 2008

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This paper presents a novel method to fabricate the horizontal frustum structure as a planar optical waveguide by using the proximity printing technique. A horizontal frustum optical waveguide with a both lateral and vertical taper structure was produced. The orthogonal and inclined masks with the diffraction effect were employed in lithography process. This method can precisely control each horizontal frustum optical waveguide geometric profile in the fabrication process. The horizontal frustum optical waveguide and its array with the same inclined angle were generated. The beam propagation simulation software (BPM_CAD) was used to modeling the optical performance. The simulation results reveal that the mode profile matched into horizontal frustum optical waveguide and fiber from the laser diode. The optical loss of horizontal hemi-frustum structure of optical waveguides was less than 0.2dB. The horizontal hemifrustum waveguide will be used for fiber coupling on boards for further optical communication systems.

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Design of a single-mode tapered waveguide for low-loss chip-to-fiber coupling

Cited by 97 publications

References 16 publications

Optical coupling to nanoscale optomechanical cavities for near quantum-limited motion transduction

Optical coupling to nanoscale optomechanical cavities for near quantum-limited motion transduction

Design of photonic crystal waveguides for evanescent coupling to optical fiber tapers and integration with high-Q cavities

New horizontal frustum optical waveguide fabrication using UV proximity printing

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