Novel manufacturing process of waveguide using selective photobleaching of polysilane films by UV light irradiation

Tsushima, Hiroshi; Watanabe, Emi; Yoshimatsu, Saori; Okamoto, Satoshi; Oka, Takeshi; Imoto, K.

doi:10.1117/12.510965

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…Therefore, some polymer materials such as polyimide and poly silane are utilized for conventional polymer waveguides, despite having a slight yellow color. In fact, those waveguides exhibit low propagation loss at 850 nm [14]. On the other hand, the results shown in Fig.…”

Section: Propagation Lossmentioning

confidence: 81%

Polymer optical waveguide with multiple graded-index cores for on-board interconnects fabricated using soft-lithography

Ishigure

Nitta

2010

Opt. Express

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We successfully fabricate a polymer optical waveguide with multiple graded-index (GI) cores directly on a substrate utilizing the soft-lithography method. A UV-curable polymer (TPIR-202) supplied from Tokyo Ohka Kogyo Co., Ltd. is used, and the GI cores are formed during the curing process of the core region, which is similar to the preform process we previously reported. We experimentally confirm that near parabolic refractive index profiles are formed in the parallel cores (more than 50 channels) with 40 microm x 40 microm size at 250-microm pitch. Although the loss is still as high as 0.1 approximately 0.3 dB/cm at 850 nm, which is mainly due to scattering loss inherent to the polymer matrix, the scattering loss attributed to the waveguide's structural irregularity could be sufficiently reduced by a graded refractive index profile. For comparison, we fabricate step-index (SI)-core waveguides with the same materials by means of the same process. Then, we evaluate the inter-channel crosstalk in the SI- and GI-core waveguides under almost the same conditions. It is noteworthy that remarkable crosstalk reduction (5 dB and beyond) is confirmed in the GI-core waveguides, since the propagating modes in GI-cores are tightly confined near the core center and less optical power is found near the core cladding boundary. This significant improvement in the inter-channel crosstalk allows the GI-core waveguides to be utilized for extra high-density on-board optical interconnections.

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Section: Propagation Lossmentioning

confidence: 81%

Polymer optical waveguide with multiple graded-index cores for on-board interconnects fabricated using soft-lithography

Ishigure

Nitta

2010

Opt. Express

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“…Specifically, multimode polymer optical waveguides have been drawing much attention because of low material and processing costs with high productivity; polymer parallel multimode waveguides are also one of the feasible solutions for off-chip interconnections. Thus, various polymer waveguides have been proposed, so far [1][2][3]. In the case of the onboard interconnections, several centimeters of waveguides would be used, because of which lithography or imprinting processes have been widely adopted for polymer waveguides.…”

Section: Introductionmentioning

confidence: 99%

Polymer parallel optical waveguide with graded-index rectangular cores and its dispersion analysis

Kosugi¹,

Ishigure²

2009

Opt. Express

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A low-loss and high-bandwidth polymer parallel optical waveguide with graded-index (GI) rectangular cores is fabricated for high-speed and high-dense optical interconnections. We demonstrate that the near-parabolic index profile formed in the rectangular-shaped core GI waveguide exhibits superior properties similar to those of GI circular core waveguides we previously reported. In particular, we focus on the modal dispersion in the GI polymer waveguides with rectangular cores by showing experimental results. In this paper, the GI rectangular cores are fabricated using the preform method. However, conventional photo-lithography and imprinting processes are viable to fabricate a similar waveguiding structure, by which fabrication of a printed circuit board embedding this waveguide would become feasible.

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“…New acrylates, epoxies, polyimides, and polysilanes have been developed for fabricating PWG. [5][6][7][8][9] They are transparent to 850-nm-wavelength light for data transmission. However, they show some absorption of visible light, as shown in Fig.…”

mentioning

confidence: 99%

Alignment Method of Polymer Waveguide and Optical Component using Fluorescence

Hasegawa¹

2005

Jpn. J. Appl. Phys.

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We have developed a new method of aligning the optical axes of a polymer waveguide (PWG) and the optical components without monitoring the intensity of light passing through them. A light path can be seen as a fluorescent image from PWG material excited by an incident light without adding any fluorescent dyes. By observing the intensity and shape of such a light path, the optical axes of the input optical components and PWG can be adjusted without monitoring the output power passing through them. This alignment method can be applied to the assembly of a complicated optical system that consists of PWGs and optical components, such as mirrors and microlenses.

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Novel manufacturing process of waveguide using selective photobleaching of polysilane films by UV light irradiation

Cited by 9 publications

References 9 publications

Polymer optical waveguide with multiple graded-index cores for on-board interconnects fabricated using soft-lithography

Polymer optical waveguide with multiple graded-index cores for on-board interconnects fabricated using soft-lithography

Polymer parallel optical waveguide with graded-index rectangular cores and its dispersion analysis

Alignment Method of Polymer Waveguide and Optical Component using Fluorescence

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