ChemOptics Inc.

Daejeon, South Korea

ChemOptics Inc.

Daejeon, South Korea
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Yoon K.-H.,Electronics and Telecommunications Research Institute | Oh S.H.,Electronics and Telecommunications Research Institute | Kim K.S.,Electronics and Telecommunications Research Institute | Kwon O.-K.,Electronics and Telecommunications Research Institute | And 5 more authors.
Optics Express | Year: 2010

We presented a hybridly-integrated tunable external cavity laser with 0.8 nm mode spacing 16 channels operating in the direct modulation of 2.5-Gbps for a low-cost source of a WDM-PON system. The tunable laser was fabricated by using a superluminescent diode (SLD) and a polymer Bragg reflector. The maximum output power and the power slope efficiency of the tunable laser were 10.3 mW and 0.132 mW/mA, respectively, at the SLD current of 100 mA and the temperature of 25°C. The directlymodulated tunable laser successfully provided 2.5-Gbps transmissions through 20-km standard single mode fiber. The power penalty of the tunable laser was less than 0.8 dB for 16 channels after a 20-km transmission. The power penalty variation was less than 1.4 dB during the blue-shifted wavelength tuning. © 2010 Optical Society of America.


Oh S.H.,Electronics and Telecommunications Research Institute | Yoon K.-H.,Electronics and Telecommunications Research Institute | Kim K.S.,Electronics and Telecommunications Research Institute | Kim J.,Electronics and Telecommunications Research Institute | And 5 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2011

We report a tunable external cavity laser (T-ECL) using a superluminescent diode (SLD) and a polymer Bragg reflector with 0.8-nm mode spacing 25 channels operating in the direct modulation of 2.5 Gb/s for a low-cost source of a wavelength division multiplexed passive optical network (WDM-PON) system. The maximum output power is 12.2mW and the slope efficiency of the T-ECL is about 0.12-0.17mW/mA in the tuning range of 20 nm at the SLD current of 50mA and at the temperature of 25°C. The T-ECL successfully operated in the direct modulation for 2.5-Gb/s transmission through 20-km standard single-mode fiber. The power penalty of the T-ECL is less than 0.8dB for 25 channels after the 20-km transmission. The power penalty variation is less than 1.5dB in the wavelength-tuning range of 20nm. The performance of the T-ECL satisfies the requirements of the WDM-PON system. © 2006 IEEE.


Kim J.-W.,Pusan National University | Kim K.-J.,Pusan National University | Oh M.-C.,Pusan National University | Seo J.-K.,ChemOptics Inc. | And 2 more authors.
Journal of Lightwave Technology | Year: 2011

Low-loss perfluorinated polymers with a controllable optical birefringence were synthesized for the purpose of fabricating polarization-splitting waveguide devices, which have become an essential part of polarization-multiplexed coherent optical communications. The birefringent polymer was embedded on one branch of the asymmetric Y-branch waveguide to produce polarization-dependent mode evolution due to the effective birefringence. The device with a branch angle of 1/300 rad and birefringence of 0.007 showed a crosstalk of -25 dB and an insertion loss of 1.5 dB from fiber to fiber. The polarization splitters based on adiabatic mode evolution exhibited negligible wavelength dependence and large tolerance in waveguide dimension. © 2011 IEEE.


Lee H.K.,ChemOptics Inc.
Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012 | Year: 2012

Low-loss polymer materials incorporating fluorinated compounds have been utilized for the various optical devices. Since reliability issues concerning the polymer device have been resolved, the polymer waveguide devices adopted massively for commercial telecommunication systems. In this presentation, the recent status on the optical polymer devices' reliability and long term stability study to ensure more than 20 years operation in the real field will be described. © 2012 IEEE.


Huang G.-H.,Pusan National University | Kim J.-W.,Pusan National University | Chu W.-S.,Pusan National University | Oh M.-C.,Pusan National University | And 3 more authors.
Optics Express | Year: 2014

Highly integrated optical components are strongly demanded because they enable wavelength-division multiplexing optical communication systems to achieve smaller footprints, lower power consumption, and enhanced reliability. Variable optical attenuator (VOA) arrays are often used with optical switches in cascaded form for reconfigurable optical add-drop multiplexer systems. Although VOAs and optical switches based on polymer waveguide technology are commercially available, it is still not viable to integrate these two array devices on a single chip because of significant interchannel crosstalk. In this work, we resolved the issue of crosstalk and integrated the arrays of optical switch and VOA on a single chip by incorporating a self-assembled scattering monolayer (SASM). The SASM was effective for scattering the planar guided mode; consequently, the crosstalk into an adjacent channel was significantly reduced, to less than 35 dB. © 2014 Optical Society of America.


Shin J.-S.,Korea Advanced Institute of Science and Technology | Lee C.-H.,Korea Advanced Institute of Science and Technology | Shin S.-Y.,Korea Advanced Institute of Science and Technology | Huang G.-H.,Pusan National University | And 4 more authors.
Optics Express | Year: 2014

Array-type optical devices are important for wavelength-division multiplexing optical communication system to achieve small footprint, mass production, and reliability. For fabricating transmitter module in an array configuration, it is difficult to achieve a passive alignment of isolator, collimating lens, and laser diode. To facilitate array isolator integration, a waveguide collimator is proposed in this work by using a low-contrast, large-core polymer waveguide. The diffraction of a guided mode propagating through a free-space region is suppressed by enlarging the guided mode. The fiber coupling loss due to the enlarged mode was overcome by incorporating an adiabatic taper structure. The excess loss of waveguide collimator including the loss through a 400-μm free-propagation region was less than 1.0 dB. ©2014 Optical Society of America.


Park S.-H.,Pusan National University | Kim J.-W.,Pusan National University | Oh M.-C.,Pusan National University | Noh Y.-O.,ChemOptics Inc. | Lee H.-J.,ChemOptics Inc.
IEEE Photonics Technology Letters | Year: 2012

Birefringence modulators for controlling the phase retardation between transverse electric (TE) and transverse magnetic (TM) polarizations are demonstrated based on polymeric waveguides. Highly birefringent polymer material is incorporated to increase the polarization dependence of the thermo-optic (TO) effect. The TO coefficient for each polarization is measured using a Mach-Zehnder device, and the polarization dependence of the TO effect is found to be 1.0 × 10 5/°C. By applying 70 mW of heating power with an integrated heater, π-phase difference is achievable between the TE and TM polarizations. For 45° input polarization, the output polarization is successfully modulated to cover the entire Poincaré sphere. © 1989-2012 IEEE.


Kim K.-J.,Pusan National University | Kim J.-W.,Pusan National University | Oh M.-C.,Pusan National University | Oh M.-C.,ChemOptics Inc. | And 2 more authors.
Optics Express | Year: 2010

A flexible polymeric Bragg reflector is fabricated for the purpose of demonstrating widely tunable lasers with a compact simple structure. The external feedback of the Bragg reflected light into a superluminescent laser diode produces the lasing of a certain resonance wavelength. The highly elastic polymer device enables the direct tuning of the Bragg wavelength by controlling the imposed strain and provides a much wider tuning range than silica fiber Bragg gratings or thermo-optic tuned polymer devices. Both compressive and tensile strains are applied within the range from-36000 μ e to 35000 μe, so as to accomplish the continuous tuning of the Bragg reflection wavelength over a range of up to 100 nm. The external feedback laser with the tunable Bragg reflector exhibits a repetitive wavelength tuning range of 80 nm with a side mode suppression ratio of 35 dB. © 2010 Optical Society of America.


Patent
Solid Inc., Chemoptics Inc. and Solid Systems Inc. | Date: 2010-11-30

The present invention relates to a passive wavelength division multiplexing device for automatic wavelength locking and a system thereof including an optical multiplexer, an optical filter, an integrated optical receiver monitor, and a tunable optical transmitter. Through wavelength locking that adjusts a wavelength of an optical signal, which changes according to an external environment such as a temperature change, into a wavelength of an optical signal having the maximum optical intensity, communication quality may be maximized by securing a stable communication channel, a locking time and a communication channel setting time may be reduced, and more robust locking may be guaranteed.


Provided are a tunable wavelength filter with an embedded metal temperature sensor and an external-cavity type tunable wavelength laser module. In detail, the tunable wavelength filter with an embedded metal temperature sensor and the external-cavity type tunable wavelength laser module achieve wavelength stability by forming a metal temperature sensor using a resistance change of a metal thin film according to temperature on a point on an isothermal layer having the same temperature distribution as the optical waveguide during a process for fabricating the optical waveguide with polymer to accurately measure a temperature of an optical waveguide.

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