Abstract:
본 발명은 높은 위상변조 효율을 갖는 InGaAsP/InP 리지(Ridge) 도파로 위상변조기의 에피박막층 제조방법에 관한 것이다. 특히, 1.55 ㎛ 파장에서 TE 모드의 위상변화가 역바이어스 전압에 선형 비례함과 동시에 높은 위상변조 효율을 갖도록 제작된 PpnN InGaAsP/InP 리지(ridge) 도파로 위상변조기에 관한 것이다. 본 발명에 의하면, InGaAsP/InP 도파로 위상 변조기의 수직방향 광구속을 얻기 위한 에피 박막층 제조방법에 있어서, N + -InP(≥2×10 18 cm -3 ) 기판 위에 0.25 두께의 N-InP(3 ×10 17 cm -3 ) 제 1클래딩층을 형성하는 단계와; 상기 제 1클래딩층 위에 0.25 두께의 n-InGaAsP(1 ×10 17 cm -3 ) 제 1도파로층과 0.25 두께의 p-InGaAsP(1 ×10 17 cm -3 ) 제 2도파로층을 순차적으로 형성하는 단계와; 상기 제 2도파로층 위에 0.75 두께의 P-InP(1 ×10 17 cm -3 ) 제 2클래딩층과 0.25 두께의 P-InP(1 ×10 17 cm -3 ) 제 3클래딩층을 순차적으로 형성하는 단계와; 상기 제 3클래딩층 위에 0.2 두께의 p + -InGaAs(1 ×10 18 cm -3 ) 전극층을 형성하는 단계를 포함하는 것을 특징으로 하는 에피 박막층 제조방법을 제시한다.
Abstract:
본 발명은 파장가변 전광 NOR 논리소자의 구현방법에 관한 것으로서, 더 상세하게는 EMILD 소자의 구조중 EAM 영역에 순바이어스를 인가하여 SOA의 특성인 이득포화를 유도함으로써 전광 NOR 논리소자를 구현하는 방법에 관한 것이다. 본 발명의 논리소자 구현방법은, EAM 영역의 전면에 AR 코팅을 하는 제1단계; DFB-LD 영역의 후면에 HR 코팅을 하는 제2단계; 상기 EAM 영역과 DFB-LD 영역이 서로 연결된 EMILD 소자의 EAM 영역에 두 입력신호 A와 B를 합쳐서 주입하여 이득포화를 일으키는 제3단계; 및 상기 DFB-LD 영역에서 나오는 CW 신호가 EAM 영역에 주입되어 EAM 영역에서 이득포화에 의해 변조되는 제4단계;를 포함하여 NOR의 논리를 가지고 출력되는 것을 특징으로 한다. 본원발명에 의하면, 파장가변 전광 NOR 논리소자를 구현하면서도 집적소자를 이용하였으므로, 종래의 구성보다 간단하여 시스템의 구성이 용이하고, 결합손실을 줄일 수 있어 증폭기와 같은 시스템 구성요소가 필요없다.
Abstract:
PURPOSE: An apparatus and method for producing an electro-optic NOR logic device are provided to produce a 10Gbit/s electro-optic NOR device using gain saturation characteristic of a semiconductor optical amplifier. CONSTITUTION: An apparatus for producing an electro-optic NOR device includes a pump signal generator, a scan signal generator, and a NOR producing unit. The pump signal generator uses an input signal pattern A and an input signal pattern B to generate the signal A+B corresponding to the sum of the input signal patterns and uses the signal A+B as a pump signal. The scan signal generator generates a clock signal from the input signal A and uses the clock signal as a scan signal. The NOR producing unit simultaneously inputs the scan signal and pump signal to a semiconductor optical amplifier in opposite directions.
Abstract:
PURPOSE: A method for fabricating epi-layer of an InGaAsP/InP ridge waveguide phase modulator having high phase modulation efficiency is provided to reduce the manufacturing cost and enhance the reliability by using a semiconductor including chemical compounds of a third and a fourth group. CONSTITUTION: A first cladding layer(20) of N-InP is formed on an N¬+-Inp substrate(10). A first waveguide layer(30) of n-InGaAsP and a second waveguide layer(40) of p-InGaAsP are formed on the first cladding layer sequentially. A second cladding layer(50) of P-InP and a third cladding layer(60) of P-InP are sequentially formed on the second waveguide layer. A p+-InGaAs electrode layer(70) is formed on the third cladding layer.
Abstract:
PURPOSE: An all-optical memory device using an EMILD(Electro-absorption Modulator Integrated Laser Diode) structure is provided to measure optical bistability features by using an EMILD structure, and to realize an all-optical flip-flop function by using the measured features, thereby reducing cost. CONSTITUTION: A variable laser(100) selects a wavelength of an input light. A pattern generator(110) forms the input light as 'set' and 'reset' pattern optical signals. An optical attenuator(120) controls strength of the pattern optical signals. A circulator(130) determines a path of the pattern optical signals. A phase controller(140) is applied with the pattern optical signals, and controls phases. An EMILD(150) is applied with the pattern optical signals, and obtains optical bistability features. A wavelength variable filter(160) filters an output light signal, and obtains a selected wavelength signal only. An optical measurer(170) obtains all-optical flip-flop wavelength features by using the optical bistability features.
Abstract:
PURPOSE: A horizontal coupled type laser diode is provided to widen a variable wavelength range by using two active elements having different propagation constants. CONSTITUTION: A horizontal coupled type laser diode is formed by coupling horizontally the first resonator including a laser diode(100) with the second resonator including an optical amplifier(200). The optical amplifier(200) has a propagation constant which is different from the laser diode(100). The first electrode(110) and the second electrode(210) are installed in an upper end portion and a lower end portion of the laser diode(100) in order to apply current to the laser diode(100) and the optical amplifier(200), respectively. Active layers of the laser diode(100) and the optical amplifier(200) are formed by InGaAsP of a multiple quantum well structures.
Abstract:
PURPOSE: A semiconductor fiber amplifier integration type wavelength converter is provided to perform easily broadband wavelength conversion and control arbitrarily a width of an output signal by integrating a semiconductor fiber amplifier and a DFB laser. CONSTITUTION: A semiconductor fiber amplifier(100) has a predetermined gain fixed point and amplifies an input optical signal. A DFB(Distributed FeedBack) laser(110) has another gain fixed point and oscillates the amplified signal to a single wavelength. An electrical separator(120) separates electrically the semiconductor fiber amplifier(100) and the DFB laser(110). A buried active waveguide(130) has a multi-quantum well structure. A grating(140) is formed on the edge portion of the buried active waveguide(130) and reflects or transmits the light.
Abstract:
PURPOSE: A method for measuring a sectional reflexibility of a field absorption type device is provided to measure easily an optical variable by using an optical current. CONSTITUTION: A lens type fiber(21) transfers a laser beam emitted from a variable wavelength laser(10). The laser beam passing through the lens type filter(21) is irradiated on a section of a device(15). A chopper(11) turns on or off the variable wavelength laser(10). An optical rotator(14) is formed at a position adjacent to a polarization controller(13) in order to control a path of the laser beam. An optical detector(16) is connected with the optical rotator(14) in order to measure a change of reflective intensity of a reflected beam. A lock-in amplifier(17) is connected with the chopper(11) in order to detect a modulated variable wavelength laser beam. A power supply(18) supplies power to each component. A voltage separator(18) separates a signal influence between the device(15) and the lock-in amplifier(17).
Abstract:
본 발명은 반도체 광증폭기를 이용한 전광 XOR 논리소자의 구현방법에 관한 것으로서, 더 상세하게는 반도체 광증폭기에 주입되는 전류와 입사되는 조사신호 및 펌프신호로 조절이 가능한 반도체 광증폭기의 인버터 특성을 이용하여 전광 XOR 논리소자를 구현할 수 있는 기술에 관한 것이다. 본 발명에 따른 XOR 논리소자의 구현방법은, 두개의 반도체 광증폭기에 펌프신호와 조사신호를 같이 입사시켜 상기 반도체 광증폭기의 이득포화와 파장변환에 의해 생기는 인버터 특성의 출력신호를 합하여 전광 XOR 논리소자의 동작특성을 얻음을 특징으로 한다. 본 발명에 의하면, 반도체 광증폭기의 인버터 특성을 이용하여 전광 XOR 논리소자를 구현하기 때문에 광섬유에 기반을 둔 소자들보다 안정적이고 다른 논리소자와의 결합이 용이하며, 클록 신호를 만들어 줄 필요가 없으므로 논리소자의 규모 및 속도 제한이 크게 줄어드는 효과가 있다.
Abstract:
PURPOSE: A semiconductor fiber amplifier integration type wavelength converter is provided to perform easily broadband wavelength conversion and control arbitrarily a width of an output signal by integrating a semiconductor fiber amplifier and a DFB laser. CONSTITUTION: A semiconductor fiber amplifier(100) has a predetermined gain fixed point and amplifies an input optical signal. A DFB(Distributed FeedBack) laser(110) has another gain fixed point and oscillates the amplified signal to a single wavelength. An electrical separator(120) separates electrically the semiconductor fiber amplifier(100) and the DFB laser(110). A buried active waveguide(130) has a multi-quantum well structure. A grating(140) is formed on the edge portion of the buried active waveguide(130) and reflects or transmits the light.