Abstract:
PURPOSE: A polarization division multiplexed optical OFDM(Orthogonal Frequency Division Multiplexing) transceiver is provided to improve the allowed value due to a non linear effect by reducing electric power difference between adjacent training symbols. CONSTITUTION: A data separation unit multiplexes a transmission signal into a plurality of groups. A training signal generation unit(160) allocates a plurality of training symbols about each OFDM data. The training signal generation unit allocates consecutive data at a time domain about each training symbols in order to generate '0'. A polarization multiplex unit(180) outputs polarization division multiplexed optical OFDM signal corresponding to each polarization component by performing polarization division multiplexing.
Abstract:
PURPOSE: By reducing the dependability of width to the input waveguide the optical device obtains the plane penetration characteristic of being stable. CONSTITUTION: The multiplexer/inverse multiplexer(130) especially disunites the optical signals of the inputted different channel in the first port(142) wavelength. The multiplexer/inverse multiplexer offers the optical signals separating as described above to the second port(144). The MMI(120) is connected to the first port of the multiplexer/inverse multiplexer.
Abstract:
본 발명에 따른 주파수 가변 테라헤르츠파 광원 소자는, 2개의 격자 주기를 갖는 이중 회절격자를 이용하여 임의의 파장에서 리트로(Littrow) 회절 조건을 만족시키는 동시에 다른 파장에서 리트만(Littman-Metcalf) 회절 조건을 만족시킴으로써, 서로 다른 두 파장에서 동시에 발진이 이루어지도록 하여 두 발진 파장의 비팅(beating)에 의해 안정적으로 테라헤르츠파를 발생시킬 수 있다. 또한, 본 발명에 따른 주파수 가변 테라헤르츠파 광원 소자는 수 THz 까지 주파수 가변이 용이하고 소형으로 제작이 가능하다. 테라헤르츠파, 파장 가변 광원, 외부 공진기, Littman-Metcalf, Littrow, 회절격자, 가변 편향기
Abstract:
A wavelength selection switch is provided to perform mass production and low cost with high reliability. A wavelength selection switch includes an optical demultiplexing part(110), an optical deflection part, and an optical multiplexing part(120). The optical demultiplexing part divides input optical signals into wavelength corresponding to each channel. The optical demultiplexing part selects and outputs the optical signal divided from the input optical signals about each channel or an optical signal inputted through an additional port. The optical deflection part individually deflects the optical signal of each channel received from the optical demultiplexing part according to current supply or voltage supply. The optical multiplexing part outputs the optical signal of each channel to a specific output port according to deflection of the optical deflection part.
Abstract:
A polarization insensitivity slab waveguide is provided to increase the reliability and performance of optical device by making a waveguide insensitive to material for the waveguide and a structure variable. In a polarization insensitivity slab waveguide, a light is projected from a waveguide area is reflected or diffracted at a diffraction grating and it is compensated. The waveguide area is composed of a first bottom cladding layer, a first core, and a top cladding layer. A polarized light compensation region comprises the bottom-clad layer, the first core layer, the top clad layer, and the second core layer.
Abstract:
본 발명은 광증폭기, 빔 조종기, 및 로렌드 원 형태를 갖는 오목 회절 격자를 단일 기판에 집적시켜 전기적으로 파장을 가변시킬 수 있는 파장 가변 광원 소자를 제공한다. 본 발명은 빔 조종기 내부의 두 개의 전극에 전기 신호를 인가하여 빔 경로를 조종하고, 조종된 빔의 경로는 회절 격자의 입사각을 변경시켜 발진 파장이 가변됨을 특징으로 한다. 본 발명은 전기적으로 파장 가변을 시키기 때문에 구조적으로 안정적이며, 파장 가변 속도도 빠른 장점을 가진다.
Abstract:
본 발명은 방사형으로 진행하는 광을 편향하는 광 편향기에 관한 것으로, 제1 유효굴절율을 가지는 주변영역; 및 상기 제1 유효굴절율과 다른 제2 유효굴절율을 가지는 소정 형상의 편향패턴 영역을 포함하되, 상기 소정 형상의 편향 패턴 영역에 의해서, 방사형으로 진행하는 광은 특정점에서 출발하여 진행하는 것으로 편향된다. 이를 통해서, 광원의 이동 궤적은 직선, 원, 타원, 포물선 등 다양한 형태가 되도록 설계할 수 있다. 광 편향기, 방사 광, 편향
Abstract:
본 발명은 광소자 및 광소자의 제조 방법에 관한 것으로, 능동 도파로와 수동 도파로가 집적된 광소자에 있어서, 수동 도파로에 도핑되지 않은 클래딩막을 형성함으로써, 수동 도파로의 광 도파 손실을 줄일 수 있고, 능동 도파로의 전류 누설을 방지하기 위한 별도의 패시베이션막 형성공정을 생략할 수 있는 광소자 및 광소자의 제조 방법을 제공한다.
Abstract:
PURPOSE: A distributed reflection laser diode including a spot-size converter and a DFB(Distributed FeedBack) laser diode is provided to increase a single mode yield and an optical output regardless of a phase of a diffraction grid by forming the spot-size converter and the DFB laser diode with one body. CONSTITUTION: A distributed reflection laser diode including a spot-size converter and a DFB laser diode includes a substrate(700), a bottom clad layer(710), a diffraction grid(720), a passive waveguide layer(740), an intermediate clad layer(750), an active layer(760), a top clad layer(770), and a ridge(780). The bottom clad layer(710) is formed on the substrate(700). The diffraction grid(720) is formed on the bottom clad layer. A bottom clad layer and an optical waveguide layer are formed on the diffraction grid. The passive waveguide layer(740) is formed on the optical waveguide layer to transmit beams to the third region. The intermediate clad layer(750) is formed on the passive waveguide layer. The active layer(760) is formed on the intermediate clad layer to transfer the beams from the second region to the passive waveguide layer. The top clad layer(770) is formed on the active layer. The ridge(780) is formed on the top clad layer. The ridge has a tapering structure.
Abstract:
PURPOSE: A wavelength conversion type electro-optic clock multiplier is provided to perform simultaneously a process for multiplying a frequency of an optical clock and a process for wavelength conversions providing an optical transmission system combined a WDM(wavelength division multiplexing) with a TDM(time division multiplexing) system with a flexible use. CONSTITUTION: A wavelength conversion type electro-optic clock multiplier includes a first photo coupler, a semiconductor optical amplifier, and a second photo coupler. The first photo coupler(13) is used for dividing the continuous beam of desired wavelength to paths. The semiconductor optical amplifier(16) is used for performing a phase modulation process for the continuous beam passing through the first path of two paths according to an optical clock having an arbitrary wavelength. The second photo coupler(14) is used for coupling the output light source from semiconductor optical amplifier to the continuous beam outputted from the second path of the first photo coupler.