• Korean Journal of Optics and Photonics
• /
• v.14 no.1
• /
• pp.33-37
• /
• 2003

A low-power $1{\times}2$ polymeric thermo-optic switch with a trench structure is proposed and fabricated. The trench structure in the optimized region slows down the heat flow from the electrodes, which contributes to the reduction of power consumption. The temperature distribution in the polymer layers has been adjusted to increase the temperature gradient between the two arms of the Y-branch. For comparison, a $1{\times}2$ polymeric thermo-optic switch with no trench structure is fabricated together on the same substrate. In the device with a trench structure, the measured crosstalk is less than -17.0 dB for TE polarization.-15.0 dB for TM polarization. The power consumption is about 66 mW, which is 25% less than that of the device with no trench structure.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1998.06a
• /
• pp.247-251
• /
• 1998

This work presents the analysis of $1\times2$ polymer waveguide thermo-optic switch using asymmetric Y-splitter at the wavelength of 1300nm. Because of the high thermo-optic coefficient of polymeric materials the design of efficient switches were feasible. For the numerical simulation of these switches the finite difference beam propagation method has been employed. Design rules for a $1\times2$ polymeric switch have been defined by using the numerical techniques.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2002.10a
• /
• pp.111-114
• /
• 2002

We propose and fabricate a vertically integrated waveguide thermo-optic switch. It controls the optical path between two vertically stacked waveguide. As a first step, we fabricate polymeric waveguides. The measured propagation loss is ranged from 0.3 db/cm to 0.4 dB/cm at the wavelength of 1.55 $\mu\textrm{m}$. We fabricate the proposed vertically integrated waveguide thermo-optic switch to demonstrate its preliminary feasibility. The measured crosstalk is better than -10 db. The power consumption is about 500 mW. Further effort is necessary to improve its performance.

• Proceedings of the Optical Society of Korea Conference
• /
• 2005.02a
• /
• pp.292-295
• /
• 2005

Variable optical attenuators (VOA) made of low-loss fluorinated polymers are demonstrated which shows a low operating power less than 30 mW due to the superior thermo-optic effect of polymer material and a low insertion loss less than 1.0 dB by incorporating highly fluorinated polymers to reduce the absorption loss at 1550 nm. An attenuator-integrated low-crosstalk polymeric digital optical switch (DOS) is also demonstrated. The switch and attenuator shares a single connected electrode which is controlled by a single current source. Due to the simple structure of the integrated attenuator, the device length is reduced to 1 cm so as to provide low insertion loss of 0.8 and 1.1 dB for 1300 and 1550 nm, respectively. The attenuator radiates remained optical signal on the switch-off branch in order to decrease the switching crosstalk to be less than -70 dB with an applied electrical power of 200 mW.

• Korean Journal of Optics and Photonics
• /
• v.18 no.1
• /
• pp.79-83
• /
• 2007

A reconfigurable photonic microwave (MW) channel selective filter was demonstrated incorporating a $1{\times}2$ switch based on two tunable polymeric resonators with different free spectral ranges. Each resonator, consisting of two cascaded rings with an electrode formed on one of them, plays a role as an on/off switch through the thermooptic effect. The optical signal carrying the MW signal is routed to either port of the switch and detected to show the filtered output at the frequency determined by the free spectral range of the corresponding resonator. When the channel centered at 10 GHz was chosen, the extinction ratio was ${\sim}30dB$, the bandwidth 1 GHz, and the electrical power consumption 4.1 mW. For the other channel located at 20 GHz, we have achieved the extinction ratio of ${\sim}30dB$, the bandwidth of 2 GHz, and the required power of 8.0 mW. Finally the crosstalk between the selected and blocked channels was higher than 24 dB.

• Proceedings of the Optical Society of Korea Conference
• /
• 2000.02a
• /
• pp.136-137
• /
• 2000

광스위치는 광통신 및 광교환 시스템에서 광 경로 제어를 위한 소자로써 누화 특성이 좋고, 스위칭 시 소모 전력이 작아야 한다. 프로텍션 스위칭(circuit protection switching)시에는 아무런 전력 소모 없이 초기 경로를 가진 스위치가 바람직하다. 기존의 전력 소모 없이 초기 경로를 가지는 스위치는 실리카 물질과 비대칭적 X-분기 광도파로를 사용하여 구현되었다$^{(1)}$ . 그러나 실리카 스위치는 열광학 계수가 작기 때문에 스위칭 할 때 전력 소모가 큰 단점이 있다. 최근에 열광학 스위치는 폴리머를 재료로 하여 많이 제작되었다$^{(2).(3)}$ . 폴리머의 열광학 계수는 실리카에 비해 10배 정도 더 크다. 대부분의 폴리머 열광학 스위치는 대칭적 Y-분기 광도파로를 사용하여 제작되었기 때문에 모든 스위칭 상태에서 전력 소모가 필요하다. 본 논문에서는 4개의 비대칭적 Y-분기 광도파로가 직렬(cascade)로 연결된 구조를 갖는2$\times$2 열광학 스위치를 제안한다. 이 스위치는 전력 소모 없이 초기 경로를 가지며, 누화 특성을 향상시킨 구조이다. (중략)