Index-and-dimensional taper and its application to photonic devices

Yanagawa, H.; Shimizu, Tetsuo; Nakamura, S.; Ohyama, I.

doi:10.1109/50.136092

Cited by 44 publications

(2 citation statements)

References 15 publications

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“…To achieve a low splice loss between optical devices that have different spot sizes, such as laser diodes, modulators, switches, and single-mode fibers, many types of spot-size transformers have been developed. [1][2][3][4][5][6][7] The spot size is a fundamental parameter for evaluating the spread of an optical field of single-mode waveguides or optical devices and is useful for evaluating the splice loss between two different singlemode waveguides. Accordingly, it is important to evaluate the accurate value of the spot size for the precise design of integrated photonic circuits that involves many waveguide-type devices.…”

Section: Introductionmentioning

confidence: 99%

Precise recursive formula for calculating spot size in optical waveguides and accurate evaluation of splice loss

Kimura

Tamura

1995

Appl. Opt.

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The spot size of a single-mode waveguide was defined from the viewpoint of a least-squares fit of the field profile to a Gaussian profile. The field profile was expanded in terms of Hermite-Gaussian functions, and a new precise recursive formula for calculating the spot size was derived. It was shown that our formula is equivalent to the best fitting of the offset coupling loss to that of a Gaussian profile and keeps its form against the Fourier transform that corresponds to the diffraction in the same manner as the Gaussian profile. The accuracy of conventional formulas and our new spot-size formula was compared with the exact value defined from the viewpoint of a least-squares fit to a Gaussian profile, and it was shown that our recursive formula is the most accurate of the approximate formulas. Next we proposed a new formula for calculating the splice loss between two waveguides and showed that our formula is more accurate than the conventional one, which involves only the spot size.

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Section: Introductionmentioning

confidence: 99%

Precise recursive formula for calculating spot size in optical waveguides and accurate evaluation of splice loss

Kimura

Tamura

1995

Appl. Opt.

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“…Unfortunately, it is extremely difficult, if not impossible, to obtain axial variations in the propagation direction of the waveguide core, by simple doping control, in the sol gel deposition process here utilised. In the FHD deposition process, such local changes are possible using a modified point-by-point glass deposition [8]. One alternative to the problem that can yield to both core dimensional and doping variations is the use of thermal diffusion of material.…”

Section: --I I--imentioning

confidence: 99%

On the design of integrated optical adiabatic tapers made by the sol-gel deposition technique

Schneider

Hattori²

1999 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference

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Mode‐field‐converting fiber for coupling to photonic devices

Yanagawa

Ono

Oyobe

1994

Electron Comm Jpn Pt II

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A mode‐field‐converting (MFC) fiber is proposed to reduce mode‐field mismatch loss which is produced when an optical fiber and a photonic device chip are butt‐coupled to each other. an MFC fiber is fabricated by fusion‐splicing a specially designed device‐compatible fiber with an ordinary transmission‐line fiber and by heating the spliced point to form an index‐and‐dimensional taper. Also proposed is an elliptic‐mode‐field (EMF) fiber which is composed of an elliptic core and two claddings to yield a highly elliptic mode field. An EMF fiber with an ellipticity of 2 and MFC fibers with the EMF fiber were fabricated experimentally and the lowest conversion loss of 0.09 dB was obtained. the MFC fiber was designed for coupling to a semiconductor optical switch and achieved shape conversion. Arrays of eight MFC fibers also were fabricated, and the lowest loss was 0.11 dB with a size conversion ratio of 2. the MFC fiber array was designed for coupling to a high‐Δ silica waveguide. Those loss values around 0.1 dB were sufficiently lower than the corresponding initial mode‐field mismatch losses of 0.7 and 1.7 dB; and, thus, the loss reduction effect of an MFC fiber was confirmed experimentally.

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Index-and-dimensional taper and its application to photonic devices

Cited by 44 publications

References 15 publications

Precise recursive formula for calculating spot size in optical waveguides and accurate evaluation of splice loss

Precise recursive formula for calculating spot size in optical waveguides and accurate evaluation of splice loss

On the design of integrated optical adiabatic tapers made by the sol-gel deposition technique

Mode‐field‐converting fiber for coupling to photonic devices

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