소산파 집적광학 바이오센서에 적합한 Si 3 N 4 립-광도파로 해석 및 설계에 관한 연구

정홍식 한국광학회 2019 한국광학회지 Vol.30 No.1

Si 3 N 4 rib-optical waveguides for evanescent-wave integrated-optical biosensors were analytically interpreted, to derive the single-mode propagation conditions. The integrated-optical biosensor structure based on two-mode interference was proposed, and the rib width and thickness and core thickness for a single-mode and two-mode waveguide (sensing region) were proposed to be 3 µm, 2 nm, and 150 nm and 3 µm, 20 nm, and 340 nm respectively. The optical characteristics of each guided-wave mode were investigated utilizing the film mode-matching (FMM) analysis.

2×2 Ti:LiNbO_(3) 디지털 광 스위치 설계 및 제작

鄭洪植 홍익대학교 산업기술연구소 2003 産業技術 Vol.13 No.-

We propose and demonstrate a novel polarization- and wavelength-independent digital electro-optic switch in Ti:LiNbO_(3) with switching voltage of ±32V at 1.55㎛ wavelength. This 2×2 integrated optic switch is characterized by a step-like response to the applied voltage. Switching is achieved through adiabatic eigenmode transformation in an asymmetric waveguide junction. The average insertion loss of ~4.5㏈/㎝ and polarization independent switching with average cross-talk of -12㏈ are achieved.

진행파형 Ti : LiNbO3 위상 광변조기 제작 ( Fabrication of Traveling-wave Ti : LiNbO3 Phase Optical Modulators )

정홍식,엄진섭,김원옥 대한전자공학회 1993 대한전자공학회 학술대회 Vol.1993 No.1

진행파형 Ti:LiNbO$_3$위상 광변조기 설계 및 제작에 관한 연구

정홍식,서정하,엄진섭 한국통신학회 1994 韓國通信學會論文誌 Vol.19 No.9

$Ti:LiNbO_3$채널형 광도파로와 Asymmetric Coplanar Strip(ACPS) 전극구조를 이용해서, $1.3{\mu}m$에서 동작하는 진형파형 위상 광변조기를 설계, 제작한 다음 변조특성을 관찰하였다. 위상정합이 개선되도록 ACPS 진행파형 전극을 설계하기 위해서 전극과 완충박막의 두께를 포함하여, 전극제원의 해석적 함수로 특성저항, 변조파의 유효굴절률 및 전극손실 등을 고려하였다. Ti 확산방법으로 저손실 채널형 광도파로 제작하였으며, double-spin image reversal 공정을 이용해서 $2.5{\mu}m$ 두께의 전극을 형성하였다. 9GHz 부근에서의 전극구조 공진형상 때문에 변조특성이 제한 되었지만, 2.5GHz 까지는 큰 왜곡없이 변조특성이 관찰되었다. Ti : $LiNbO_3$ traveling-wave phase optical modulators at wavelength 1.3㎛ have been designed and fabricated, focusing on the optical waveguide and asymmetric coplanar electrode structure. To improve the phase-mismatch of traveling-wave ACPS electrode, the characteristic impedance, effective microwave index, and electrode loss have been presented as a function of geometric parameters including electrode and buffer layer thickness. Low-loss channel optical waveguides on $LiNbO_3$ were fabricated by the Ti diffusion method with $O_2$ water-vapor environment. $2.5{\mu}m$ thick electrode was successfully fabricated by double-spin image reversal process. Modulation bandwidth was limited by a resonance at 2.9 GHz and modulation bandwidth up to 2.5GHz was approxirnately measured.

광선로 모니터링 기능을 가진 수동 B-NT1 모듈 구현에 관한 연구

鄭洪植 홍익대학교 산업기술연구소 1995 産業技術 Vol.5 No.-

The standard architecture on the customer interface access of B-ISDN consists of three function group such as B-NT1, B-NT2 and B-TE and B-ISDN termination equipment I (B-NT1) includes function that control the access of customer equipment connected to network termination switches. In this study we constructed passive B-NT1 module which is used to do optic link management and repair which is one of the heart functions of a B-NT1. For the efficiency of installation and management this module only consists of passive optical devices which can monitor the fault point and cutting of optic link and accomplish non-interrupted service in the switch termination office. In this experiment 1550nm wavelength was used to monitor optical link cutting between subscriber loop and broadcast network at switch termination. Passive B-NT1 module for optical link monitoring is easily installed on already established optical link.

Ti:LiNbO_3 광도파로의 두 모드 간섭 원리를 이용한 편광모드 분리기

鄭洪植 홍익대학교 산업기술연구소 2001 産業技術 Vol.11 No.-

Passive polarization mode splitters at λ=1.55㎛ have been designed and fabricated based on Ti:x-cut LiNbO_3 single-mode optical waveguide and two mode interference theory. The splitting ratio with waveguide width 8㎛, branching angle 0.55˚ and interfering length 470㎛ shows 16.18㏈, 21.25㏈ for TE and TM input polarization mode, respectively. Polarization cross-talk of -16.28㏈ and -21.28㏈ for TE and TM mode have been achieved. Total insertion loss of 2.24㏈/㎝ (TE) and 2.41㏈/㎝ (TM) have been also measured. The devices operated nearly wavelength independent over a range of 30㎚.

LiNbO₃위상광변조기에서 헤테로다인 기술을 이용한 위상변이 측정에 관한 연구

鄭洪植 홍익대학교 산업기술연구소 1998 産業技術 Vol.8 No.-

Phase shift keying (PSK) and Differential phase shift keying (DPSK) are the most attractive technique for coherent lightwave communication system due to its potential of achieving higher receiver sensitivity. In such communication system. one of the key optical components is the optical phase modulator, as it has the advantages of wide bandwidth and low drive voltage which are in general required in such system the most practical for this application. The phase shift of a given drive voltage V_pp is determined by measuring the relative power at the carrier and the first-order sideband frequencies using heterodyne techique. For Ti LiNbO_3 phase modulator, a half wave voltage of 6.73(V) was measured.

행정전산망 사업의 현황과 발전 방향

정홍식,Jeong, Hong-Sik 한국전자정보통신산업진흥회 1990 電子振興 Vol.10 No.3

송년특집-국가기간전산망 사업과 정보산업 육성

정홍식,Jeong, Hong-Sik 한국전자정보통신산업진흥회 1988 電子振興 Vol.8 No.12

국제중재에서 판매점의 보상청구권

정홍식 국제거래법학회 2013 國際去來法硏究 Vol.22 No.1

This article mainly deals with distributor’s indemnity rights in cross-border transactions and further focuses on its effect in the situation of international arbitration setting. Distributor often seeks for indemnity compensation from its supplier when contract is terminated or expired, if the distributor has a similar status of commercial agent in the contract with its supplier. Most of jurisdictions have no specific statute regulating distributorship arrangement, except Belgium which has a statute created in 1961 allowing distributor such indemnity compensation in addition to regular compensation. Such indemnity compensation further deems to be recognized as internationally mandatory rules. Other European jurisdictions such as Germany analogically apply the indemnity compensation normally available to commercial agents to distributors in a limited situation. Commercial agent’s indemnity compensation in Germany and other EU member countries is also recognized as internationally mandatory rules. A problem arose where a Belgium distributor files lawsuit with its court against a California supplier in spite of a valid arbitration agreement in which both parties agreed to resolve any dispute arising out of the distribution contract by arbitration in the site of California with California laws. Belgium Supreme Court invalidated the arbitration agreement and awarded the distributor indemnity compensations, holding that the arbitral panel is not certainly considering and applying the statute protecting its national distributor. The Court reasoned that the distributor’s indemnity compensation is not arbitrable. Similarly, German court also denied arbitration agreement contained in commercial agency contract in a similar situation of Belgium case because of the similar reasons of the Belgium court. Such decisions have been heavily criticized. This article describes the Belgium’s statute and German court’s analogical application of the indemnity compensation to distributor. It also analyzes whether such right is the internationally mandatory rules. The article further illustrates Belgium and German courts’ denial of arbitration agreement where their national distributor and commercial agent sought indemnity compensation through the court proceedings rather than through the agreed upon arbitration process. The courts denied the parties arbitration agreements because the arbitral tribunal will certainly not apply their internationally mandatory rules irrespective of the agreed governing law. It seems that the courts are placed in a dilemma. This article finally suggests that such dilemma can be resolved by arbitrator’s application of the internationally mandatory rules in the arbitration process.