A simple laterally tapered waveguide for low-loss coupling to single-mode fibers

Kasaya, K.; Mitomi, O.; Naganuma, M.; Kondo, Y.; Noguchi, Yoshio

doi:10.1109/68.205633

Cited by 89 publications

(23 citation statements)

References 9 publications

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“…Coupling to and from these devices usually involves high losses resulting from mode-size and effective-index mismatch between the optical fiber and the waveguide structure, which induces coupling to radiation modes and back reflection. To date, most of the on-chip structures suggested to alleviate this coupling problem [48][49][50][51] have suffered from at least one of the following drawbacks: they are very long (hundreds of micrometers), are difficult to fabricate or have strong backreflection. Therefore tapered devices that transition from waveguide dimensions to the fiber dimensions have been suggested.…”

Section: Butt Couplingmentioning

confidence: 99%

Integrated Optomechanical Circuits and Nonlinear Dynamics

Tang

Pernice

2014

Cavity Optomechanics

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Chip-scale optomechanical resonators have the advantage of higher Q values, smaller dimensions, and thus a greater potential for scalability and device control. This chapter discusses further integration of chip-scale optomechanic elements on a circuit level. Circuit integrated optomechanics brings a range of additional benefits for both fundamental studies and practical device applications of optomechanics. It takes advantage of many circuit components that have been developed by the nanophotonics community, such as grating couplers, splitters, combiners and low loss waveguides, which can be directly utilized to form scalable circuits for routing optical signals. High quality photonic resonators and band-gap structures, such as microring, microdisk, and photonic crystal nanocavities, can be seamlessly embedded in the circuit for direct interfacing with nanomechanical resonators without suffering from significant optical loss. Homodyne detectors, such as Mach-Zehnder interferometers, are implemented directly as part of the circuit to achieve sensitive, alignment free measurement of mechanical motion. Circuit optomechanics not only leads to further scaling of optomechanical systems but also brings new interaction dynamics in light-mechanics coupling. We will discuss the various radiation dynamics and non-radiation dynamics that are present in circuit optomechanical systems. Integrated Optomechanics and Optomechanical CircuitsLately we have witnessed rapid progress in cavity optomechanics with demonstration of dynamic back-action cooling and amplification of mechanical structures of vastly different length scales. In particular, chip-scale optomechanical resonators

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Section: Butt Couplingmentioning

confidence: 99%

Integrated Optomechanical Circuits and Nonlinear Dynamics

Tang

Pernice

2014

Cavity Optomechanics

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“…With a view to accomplishing highly efficient optical interconnection between optical fiber and waveguide, the mode mismatch and the difference of the refractive index between them must be considered and several methods to remove the obstacles have been suggested. [1][2][3][4][5][6] Out-of-plane couplers have advantages of easy high dense integration and large alignment tolerance. In addition, they make it possible to do wafer scale testing easily because of no need of making mirror facets.…”

Section: Introductionmentioning

confidence: 99%

Design and characterization of an out-of-plane polymer waveguide grating coupler

et al. 2007

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A polymer waveguide grating coupler to vertically couple light between planar waveguide and fiber is proposed and designed. In order to estimate the coupling performance of the proposed coupler with curved and chirped grating, the diffraction characteristics of the waveguide grating with a uniform period as an in/out out-of-plane coupler are investigated. The coupling efficiency and coupling length exhibiting the diffraction characteristics of a uniform waveguide grating with various structure parameters are calculated based on Bloch-wave analysis. With the optimized structure parameters showing the high coupling performance, the overall coupling efficiency of the polymer waveguide grating coupler is obtained by introducing 2D Bloch-wave analysis-based local linear grating model. The calculated overall coupling efficiency of the coupler is determined to be approximately 30%.

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“…Much attention has been paid to the design and analyses of waveguide tapers [2,3] and waveguide bends [4 -6]. Marcatili [7] presented a design procedure, based on the scalar wave equation, for developing lossless curved-axes tapered waveguides.…”

Section: Introductionmentioning

confidence: 99%

“…A number of numerical approaches for the analysis of the broadside-coupled line structure have been published in literature [2][3][4][5][6], but all of these approaches required extensive analytical effort and require complicated mathematical programming. A set of simple analysis and synthesis equations has been presented for broadside-coupled suspended substrate [7,8], but it has a limited range of structural parameters.…”

Section: Introductionmentioning

confidence: 99%

Design and analyses of compact bent‐tapered waveguides using guided‐wave lens sets

Chang¹,

Hsieh²

2004

Micro & Optical Tech Letters

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produced, or the same thresholds for both modes can be obtained, which results in the third state.By using the tuning scheme to apply axial and lateral strain on the FBG, we can change the wavelengths of the dual-wavelength laser. Figure 3 shows the output spectrum of the EDFL when the axial strain is 818 (according to the translation stage's displacement of 0.1 mm) and the screw angle is 50°. The dual lasing wavelengths are 1554.44 and 1554.84 nm, respectively. Figure 4 shows the dependence of the wavelength spacing upon the lateral strain when the axial strain is zero and Figure 5 shows the wavelength shift with respect to the axial strain when the lateral strain is zero. Linear responses were observed in both figures. Considering the mechanical properties of glass fiber, the wavelength shift can not exceed ϳ 2 nm using the axial-strain tuning method. CONCLUSIONIn conclusion, we have demonstrated a tunable, stable dual-wavelength EDFL at room temperature with only a single-mode FBG applied with lateral strain. Adjusting a PC in the cavity allows us to achieve either single-or dual-wavelength laser outputs. Two lasing wavelengths of this simple and low-cost laser can be tuned continuously. ACKNOWLEDGMENTSThis work is supported by the Tianjin Natural Science Foundation project, multiwavelength optical fiber laser in DWDM communication systems, under grant no. 013601811, and the startup Foundation of Scientific Research provided by the Personnel Department of Nankai University, P.R. China. DESIGN AND ANALYSES OF COMPACT BENT-TAPERED WAVEGUIDES USING GUIDED-WAVE LENS SETS

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A simple laterally tapered waveguide for low-loss coupling to single-mode fibers

Cited by 89 publications

References 9 publications

Integrated Optomechanical Circuits and Nonlinear Dynamics

Integrated Optomechanical Circuits and Nonlinear Dynamics

Design and characterization of an out-of-plane polymer waveguide grating coupler

Design and analyses of compact bent‐tapered waveguides using guided‐wave lens sets

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