Abstract
We theoretically estimate the inter-channel crosstalk in densely aligned multimode polymer parallel optical waveguides using a beam propagation method, and compare the results of graded-index (GI)-core waveguides with those of conventional step-index (SI)-core counterpart. In particular, we simulate the crosstalk in bridged core waveguides. Here, the bridged core is sometimes observed in the waveguides fabricated using the imprinting method. The inter-channel crosstalk in SI-core waveguide increases from-25 dB to-4 dB with increasing the bridge thickness. Contrastingly, the worst crosstalk in a GI-core is as low as-15 dB despite the bridged structure as long as the bridge of the core is not included in the index distribution of the GI-core core, namely SI bridged core. In addition, the crosstalk in the GI-core decreases when the multiple cores aligned in parallel have a different structure (core size, refractive index, etc.), because the difference in the core structure makes changes in the distribution of propagation constants, resulting in decreasing the mode coupling efficiency between the two cores. Hence, the worst crosstalk in the GI-core waveguide with a slightly different core structure is as low as-19 dB despite the bridged structure. Thus, the imprinting method should be utilized for GI-core waveguides: the inter-channel crosstalk is un-problematic even if a residual layer remains.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Publisher | SPIE |
| Volume | 8989 |
| ISBN (Print) | 9780819499028 |
| DOIs | |
| Publication status | Published - 2014 |
| Event | Smart Photonic and Optoelectronic Integrated Circuits XVI - San Francisco, CA, United States Duration: 2014 Feb 5 → 2014 Feb 6 |
Other
| Other | Smart Photonic and Optoelectronic Integrated Circuits XVI |
|---|---|
| Country | United States |
| City | San Francisco, CA |
| Period | 14/2/5 → 14/2/6 |
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Keywords
- Beam propagation method
- Mode coupling
- Nonidentical cores
- On-board Optical Interconnect
- Optical waveguide
ASJC Scopus subject areas
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Inter-channel crosstalk in densely aligned multimode polymer parallel optical waveguides. / Kudo, Takuya; Ishigure, Takaaki.
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8989 SPIE, 2014. 89890W.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Inter-channel crosstalk in densely aligned multimode polymer parallel optical waveguides
AU - Kudo, Takuya
AU - Ishigure, Takaaki
PY - 2014
Y1 - 2014
N2 - We theoretically estimate the inter-channel crosstalk in densely aligned multimode polymer parallel optical waveguides using a beam propagation method, and compare the results of graded-index (GI)-core waveguides with those of conventional step-index (SI)-core counterpart. In particular, we simulate the crosstalk in bridged core waveguides. Here, the bridged core is sometimes observed in the waveguides fabricated using the imprinting method. The inter-channel crosstalk in SI-core waveguide increases from-25 dB to-4 dB with increasing the bridge thickness. Contrastingly, the worst crosstalk in a GI-core is as low as-15 dB despite the bridged structure as long as the bridge of the core is not included in the index distribution of the GI-core core, namely SI bridged core. In addition, the crosstalk in the GI-core decreases when the multiple cores aligned in parallel have a different structure (core size, refractive index, etc.), because the difference in the core structure makes changes in the distribution of propagation constants, resulting in decreasing the mode coupling efficiency between the two cores. Hence, the worst crosstalk in the GI-core waveguide with a slightly different core structure is as low as-19 dB despite the bridged structure. Thus, the imprinting method should be utilized for GI-core waveguides: the inter-channel crosstalk is un-problematic even if a residual layer remains.
AB - We theoretically estimate the inter-channel crosstalk in densely aligned multimode polymer parallel optical waveguides using a beam propagation method, and compare the results of graded-index (GI)-core waveguides with those of conventional step-index (SI)-core counterpart. In particular, we simulate the crosstalk in bridged core waveguides. Here, the bridged core is sometimes observed in the waveguides fabricated using the imprinting method. The inter-channel crosstalk in SI-core waveguide increases from-25 dB to-4 dB with increasing the bridge thickness. Contrastingly, the worst crosstalk in a GI-core is as low as-15 dB despite the bridged structure as long as the bridge of the core is not included in the index distribution of the GI-core core, namely SI bridged core. In addition, the crosstalk in the GI-core decreases when the multiple cores aligned in parallel have a different structure (core size, refractive index, etc.), because the difference in the core structure makes changes in the distribution of propagation constants, resulting in decreasing the mode coupling efficiency between the two cores. Hence, the worst crosstalk in the GI-core waveguide with a slightly different core structure is as low as-19 dB despite the bridged structure. Thus, the imprinting method should be utilized for GI-core waveguides: the inter-channel crosstalk is un-problematic even if a residual layer remains.
KW - Beam propagation method
KW - Mode coupling
KW - Nonidentical cores
KW - On-board Optical Interconnect
KW - Optical waveguide
UR - http://www.scopus.com/inward/record.url?scp=84901701615&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84901701615&partnerID=8YFLogxK
U2 - 10.1117/12.2038878
DO - 10.1117/12.2038878
M3 - Conference contribution
AN - SCOPUS:84901701615
SN - 9780819499028
VL - 8989
BT - Proceedings of SPIE - The International Society for Optical Engineering
PB - SPIE
ER -