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Daejeon, South Korea

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.


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.


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.


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.


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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