Low-loss design and fabrication of multimode polymer optical waveguide circuit with crossings for high-density optical PCB

Ishigure, Takaaki; Shitanda, Keishiro; Kudo, Tetsuichi; Takayama, Shotaro; Mori, Tetsuya; Moriya, Kimio; Choki, Koji

doi:10.1109/ectc.2013.6575587

Cited by 17 publications

(7 citation statements)

References 17 publications

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“…(2) in both SI-core and GI-core crossed waveguides. Figure 2 shows the results we previously reported [19]. Here, the total (accumulated) loss due to the crossings is plotted with respect to the number of crossing for the SI-and GI-core crossed waveguides.…”

Section: Optical Loss Due To Crossing Structurementioning

confidence: 71%

“…In Fig. 2, the experimentally measured loss for a GI-core crossed waveguide is compared [19], which shows remarkably low values as calculated, but they are even lower than the simulated result.…”

Section: Optical Loss Due To Crossing Structurementioning

confidence: 80%

“…In the above sections, we simulate the loss of the GI-core crossed waveguide with the index exponents p = q = 3, although it is well known that the condition of p = q = 2 should be ideal from the modal dispersion point of view. After we published the simulated results [19], other ways to fabricate GI-core crossed waveguides have been investigated [12]. However, the index profile looks deviated from a parabolic shape, and even asymmetric.…”

Section: Index Profile Dependencementioning

confidence: 99%

“…In the above calculations, we set the parameters p and q to be identical, but in general the p and q could be different when we utilize several techniques for fabricating GI-core waveguides as currently proposed. We preliminary calculated the influence of different p and q, and reported it in [19], but the detailed discussion for such asymmetric index profile (p ≠ q) will be published elsewhere.…”

Section: Index Profile Dependencementioning

confidence: 99%

See 3 more Smart Citations

Index-profile design for low-loss crossed multimode waveguide for optical printed circuit board

Ishigure¹,

Shitanda²,

Oizmi³

2015

Opt. Express

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We present an index profile design for remarkably low loss multimode optical crossed waveguide. In this paper, we theoretically calculate the light propagation loss in crossed waveguides with step-index (SI) and graded-index (GI) square cores utilizing a ray tracing simulation. In this simulation, we focus on the index exponent values for the GI profile, which allows low crossing loss even if the number of crossing is as large as 50 or even if the crossing angle is as low as 20°. It is revealed that an index exponent of 2.0 for the GI core strongly contributes to exhibit 35 times lower loss (0.072 dB after 50-perpendicular crosses) compared to the loss of the SI-core counterpart (2.58 dB after the same crossings). The GI cores with a smaller index exponent exhibit better loss in crossed waveguides with a wide range of crossing angles from 30° to 90°. Furthermore, we discuss the effect of the refractive index profile at the intersection on the optical loss of crossed waveguides.

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Section: Optical Loss Due To Crossing Structurementioning

confidence: 71%

Section: Optical Loss Due To Crossing Structurementioning

confidence: 80%

Section: Index Profile Dependencementioning

confidence: 99%

Section: Index Profile Dependencementioning

confidence: 99%

See 2 more Smart Citations

Index-profile design for low-loss crossed multimode waveguide for optical printed circuit board

Ishigure¹,

Shitanda²,

Oizmi³

2015

Opt. Express

Self Cite

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show abstract

“…Here, the accumulated losses of all the crossings are plotted with respect to the number of crossings. The detailed calculation conditions are indicated in [10], but it should be emphasized that the refractive index of the intersection is supposed to be uniform, namely SI, even if other straight regions have GI profiles. In the aforementioned SI core, the lightwave is not confined if the cladding is missing.…”

Section: Ray Trace Simulationmentioning

confidence: 99%

Graded-index core polymer optical waveguide for high-bandwidth-density optical printed circuit boards: fabrication and characterization

Ishigure

2014

Optical Interconnects XIV

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We demonstrate that graded-index (GI) core polymer optical waveguides are a promising component realizing highbandwidth-density on-board interconnects. As a method for fabricating GI-circular-core polymer optical waveguides, we introduce the Mosquito method utilizing a microdispenser. The Mosquito method is capable of accurately controlling the core diameter and the inter-core pitch. We also demonstrate that the GI-core polymer waveguides enable remarkably low loss waveguide circuits involving waveguide crossings in a mono layer. We show an alternative technique to realize the low-loss GI-core crossed waveguide: the photo-addressing method which was developed by Sumitomo Bakelite Co., Ltd.

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Photonics in Data Centers

Yoo

Proietti

Grani

2017

Optical Switching in Next Generation Data Centers

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Low-loss design and fabrication of multimode polymer optical waveguide circuit with crossings for high-density optical PCB

Cited by 17 publications

References 17 publications

Index-profile design for low-loss crossed multimode waveguide for optical printed circuit board

Index-profile design for low-loss crossed multimode waveguide for optical printed circuit board

Graded-index core polymer optical waveguide for high-bandwidth-density optical printed circuit boards: fabrication and characterization

Photonics in Data Centers

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