Dr. Woo-Jin Lee Profile

Dr. Woo-Jin Lee

at ETRI

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Publications (5)

Proceedings Article | 4 October 2006 Paper

Optical transmitter module using polymer waveguide with fully integrated reflector mirrors

In-Kui Cho, Seoung-Ho Ahn, Woo-Jin Lee, Sang-Pil Han, Byeong-Soo Bae, Keun Byoung Yoon, Myung-Yung Jeong, Hyo Hoon Park

Proceedings Volume 6351, 635116 (2006) https://doi.org/10.1117/12.688493

KEYWORDS: Waveguides, Reflectors, Mirrors, Transmitters, Optics manufacturing, Surface finishing, Ultraviolet radiation, Vertical cavity surface emitting lasers, Polishing, Polymer multimode waveguides

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The cost-effective and repeatable technology for integration of polymer multimode waveguide and out-of-plane 45° reflector mirrors is developed. This method is cost-effective, repeatable, robust, and fully compatible with the standard manufacturing processes for a 90° optical bending structure. The basic concept of the technology for integration of waveguide and out-of-plane 45° reflector mirrors is as follows; 1) The positively patterned master in order to mold waveguides is manufactured by using photolithography and Deep RIE (Reactive Ion Etching). And the master is polished to obtain 45°-inclined plane. 2) Both sides of the positively patterned master are divided into three parts by using a sawing machine. One is a center master (main-master) with a positively patterned waveguide and the others are side masters (sub-master) without a pattered waveguide. The main master and sub-master turned over get back together again. 3) The negatively patterned PDMS master to be able to mold simultaneously both waveguide and out-of-plane 45° reflector mirrors is manufactured through pouring PDMS gel into master and thermally curing the PDMS master. 4) The multimode tapered waveguides with out-of-plane 45° reflector mirrors are simultaneously embossed by using PDMS master. The UV (Ultraviolet) curable material is organic-inorganic hybrid material (HYBRIMER, core index: 1.51, clad index: 1.48). The transmitter module is constructed on a MOB. The MOB was employed for several purposes; to align optical module passively, to use as heat sinker and also to support the boards. On this MOB, 1×4 arrays of vertical-cavity surface-emitting laser (VCSEL) and Tapered Waveguide with 45° reflector mirrors are integrated. The height and width of waveguide's core are 100 μm, 60 μm respectively and the pitch is 250 μm. The transmission access lines in transmitter are designed considering differential impedance matching for high-speed operation. We measured the insertion loss of this transmitter module using a 62.5 μm graded index fiber. The average insertion loss value is roughly about 7dB.

Proceedings Article | 3 October 2006 Paper

Index modulation type waveguides written by laser direct writing technology

Woo-Jin Lee, In-Kui Cho, Sang-Pil Han, Woo-Soo Kim, Byeong-Soo Bae, Seoung-Ho Ahn

Proceedings Volume 6351, 635117 (2006) https://doi.org/10.1117/12.688762

KEYWORDS: Waveguides, Modulation, Refractive index, Laser applications, Etching, Organic hybrid materials, Wave propagation, Cladding, Polymers, Atomic force microscopy

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In this paper, we describe the cost-effective and simplified fabrication of an index modulation type buried waveguide using laser direct writing. Our studies have a potential of manufacturing waveguides on an uneven surface and a large area because there is no need for photo-mask, etching and development processes. We used organic-inorganic hybrid materials (HYBRIMER) for the fabrication of the waveguides, which have a high transparency from a visible region to an infrared region. We exposed the core layer (HYBRIMER) to a focused laser beam after a one-step spin coating process on a buffer layer. The silicon oxide was used as a buffer layer. The refractive index of the HYBRIMER film is increased by exposure from a laser beam. Therefore, the refractive index of the exposed region is higher than that of the unexposed region, which forms the index modulation type waveguide without an etching process. The fabricated waveguide channels were baked at 120°C during 3hrs for stabilization of the organic and inorganic networks. The laser direct writing apparatus was used to produce the pattern of waveguide channels. This system consists of a He-Cd laser radiating 325nm beam, high-resolution computer-controlled translation stages and a video camera that images the sample onto a monitor. The pattern of the waveguide channel was written using various writing speeds to optimize the writing condition. The core section of optimized waveguides was a rectangular shape and the core dimension was 7μm wide and 8μm high. The refractive index is increased from 1.495 to 1.5 after exposure. The difference of the refractive index between the core and cladding was approximately 0.33%. The insertion loss of the waveguides was measured by cut-back method using a single-mode fiber as an input tip, a multimode fiber (50 μm GI) as an output tip, and a 1310nm wavelength laser light source. The insertion loss shows a linear relationship with the length of the waveguide. The propagation loss of the buried waveguide was approximately 0.3dB/cm at a wavelength of 1310nm.

Proceedings Article | 17 November 2005 Paper

Transmission characteristics of waveguide-embedded optical backplane system

Seung-Ho Ahn, In-Kui Cho, Woo-Jin Lee, Sang-Pil Han, Keun-Byoung Yoon, Myung-Yung Jeong, Man-Seop Lee

Proceedings Volume 5999, 59990X (2005) https://doi.org/10.1117/12.630313

KEYWORDS: Waveguides, Receivers, Transmitters, Polymer multimode waveguides, Polymers, Vertical cavity surface emitting lasers, Eye, Telecommunications, Optics manufacturing, Optical interconnects

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Proceedings Article | 25 October 2005 Paper

Fully optical backplane system using novel optical plug and slot

In-Kui Cho, Seung-Ho Ahn, Woo-Jin Lee, Sang-Pil Han, Jin-Tae Kim, Chun-Ki Choi, Kyung-Up Shin, Keun Byoung Yoon, Myung-Yung Jeong, Hyo Hoon Park

Proceedings Volume 6014, 60140I (2005) https://doi.org/10.1117/12.630311

KEYWORDS: Waveguides, Polymer multimode waveguides, Polymers, Transmitters, Receivers, Optical printed circuit boards, Metals, Active optics, Data transmission, Optical alignment

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Proceedings Article | 22 October 2004 Paper

Board-to-board optical interconnection using novel optical plug and slot

In Cho, Keun Byoung Yoon, Seong Ahn, Jin Tae Kim, Woo Jin Lee, Kyoung Up Shin, Young Un Heo, Hyo Hoon Park

Proceedings Volume 5524, (2004) https://doi.org/10.1117/12.558644

KEYWORDS: Waveguides, Polymer multimode waveguides, Polymers, Transmitters, Receivers, Optical printed circuit boards, Metals, Optical interconnects, Vertical cavity surface emitting lasers, Data transmission

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