Abstract:
본 발명은 편광 의존성이 낮은 폴리머 광소자 및 그 제조방법을 개시한다. 개시된 본 발명의 폴리머 광소자는, 기판, 상기 기판상에 형성되어 있는 하부 클래딩층, 상기 하부 클래딩층 상의 소정 부분에 형성되는 적어도 하나의 코어층 패턴, 및 상기 코어층 패턴이 형성된 하부 클래딩층 상부에 적어도 2층의 서브 상부 클래딩층으로 구성되는 상부 클래딩층을 포함한다. 상기 서브 상부 클래딩층의 두께 및 적층 회수를 조절하여 폴리머 광소자의 복굴절율을 개선할 수 있어, 편광 의존성을 줄일 수 있다. 폴리머, AWG, 파장 다중화, 도파로
Abstract:
본 발명은 페브리 페롯(Fabri-Perot)필터와 전극 어레이를 포함하여 구성된 파장가변형 반도체레이저에 관한 것으로, 전극들에 전기장 또는 전류를 인가함으로써 캐비티 내부에 광신호의 진행방향을 연속적으로 변화시킬 수 있으며, 인트라 캐비티 레이저 빔의 연속적인 각 변화에 의하여 넓은 파장대역에 걸쳐 연속적으로 파장가변이 가능하도록 한다.
Abstract:
본 발명은 전송용 광섬유에 관한 것으로, SiO 2 로 이루어진 코어 및 클래딩을 포함하는 전송용 광섬유에 있어서, 코어 및 클래딩의 SiO 2 에 GeO 2 및 F가 도핑된 것을 특징으로 한다. 따라서, 코어 및 클래딩의 굴절률을 조정하여 원하는 분산 값과 낮은 비선형성을 유지하면서 높은 라만 이득계수를 얻을 수 있고, 레이저 다이오드의 펌프파워를 줄일 수 있고, 펌프파워를 줄임으로 해서 레이저 다이오드의 가격을 인하할 수 있으며, 레이저 다이오드가 고출력으로 동작하지 않아도 되기 때문에 수명이 연장되는 효과가 있다.
Abstract:
PURPOSE: An optical amplifier is provided to improve the pumping efficiency by using phosphors of 1.6 micrometer emitted from ions of holmium added to an optical fiber or an optical waveguide. CONSTITUTION: An optical amplifier includes an optical member, a pumping unit, an input unit, a WDM coupler, and an output unit. The optical member includes a core including holmium and a clad. The pumping unit is optically connected to the pumping unit in order to irradiate the pumping light to the optical member. The pumping unit includes the first light source for emitting light of a wavelength band of 11,200 to 11,500 cm¬-1 and the second light source for emitting light of a wavelength band of 6,000 to 6,500 cm¬-1. The input unit inputs an optical signal to the optical member. The WDM coupler is used for coupling incident signal light of the input unit and the pumping light of the pumping unit. The output unit receives an amplified signal of the optical member.
Abstract:
PURPOSE: A holmium-doped glass optical fiber composite and a glass optical fiber and an optical amplifier using the same are provided, which enables an amplification of an optical signal in the bandwidth of 1340-1410nm. CONSTITUTION: According to the glass optical fiber composite including a core containing holium(Ho) and a clad containing more than one of a transition metal ion or a rare earth ion, the holium is doped below 0.5 mol %, and a representative phonon energy is below 600 cm-1, and an absorption band in a short wavelength is below 530 nm. An Ytterbium(Yb) below 1mol% is further doped to the core. The transition metal ion is selected among Ti(3+), V(5+), Cr(3+) and Ca(2+). And the rare earth ion is selected among Ee(3+), Tb(5+), Eu(3+) and Nd(2+).
Abstract:
PURPOSE: A high wavelength selector, and multi-channel selector for space and wavelength in high speed optical integrated circuit using the high wavelength selector is provided to solve problems of process complication, high costs and low-rate production by using an optical waveguide switch made of electro-optical polymer and glass materials. CONSTITUTION: An apparatus for selecting a high speed quantum integrated space and a wavelength multiplexing channel by using the high speed wavelength selector includes a spatial multiplexing channel selector(A), N channel high speed wavelength selector(B), an optical amplifier(106) and a wavelength convertor(105). The spatial multiplexing channel selector(A) is provided with an optical waveguide switch(104) made of a planar waveguide integration type and 1 x M channel couplers(107) and formed on an input terminal of the optical waveguide for selecting the spatial multiplexing optical signal channel in high speed to output. The optical amplifier(106) is installed on an optical waveguide(101) between a spatial multiplexing channel selection switch(A) made of a planar waveguide integration type and N channel high speed wavelength selector(B) and amplifies an optical signal passing therethrough to output the amplified optical signal to the N channel high speed wavelength selector(B). The N channel high speed wavelength selector(B) installed on the optical waveguide(101) in the output terminal of the optical amplifier(106) selectively outputs the amplified optical signal as a channel wavelength.
Abstract:
PURPOSE: A mode locking optical fiber laser oscillating apparatus is provided to stabilize a laser oscillator on a real time basis by stabilizing a length of an optical fiber laser oscillator by feeding a frequency change as an error signal back to the laser oscillator by using the fact that a frequency transition value of a Brillouin signal is sensitive to a temperature. CONSTITUTION: A Brillouin pump(101) generates a Brillouin pump signal to generate a Brillouin signal. A single mode optical fiber(102) generates a Brilliouin stimulated scattering. A directional first optical fiber coupler(103) inserts the Brillouin pump signal into an oscillator. An optical circulator(104) outputs a returning Brillouin signal. A semiconductor laser(112) serves as an excitation pump optical source for an optical pump to an erbium addition optical fiber(111) for a mode locking optical fiber laser oscillation. The second optical fiber coupler(113) couples optical signals. A function generator(114) generates a signal. An optical modulator(115) makes an active mode locking through a signal inputted from the external function generator(114). The third optical fiber coupler(116) monitors a mode locked laser output. An optical isolator(117) proceeds an optical signal in one direction. An optical fiber PZT(121) is electrically and variably shrunken and expanded to stabilize a length of the oscillator. An optical receiver(122) receives the Brillouin signal. A frequency comparator(123) compares the Brillouin signal detected from the optical receiver(122) and the frequency of the signal generated from the function generator(114). A frequency-voltage converter(124) converts the signal output from the frequency comparator(123) into an electric signal. An electric amplifier(125) amplifies the electric signal converted by the frequency-voltage converter(124).
Abstract:
PURPOSE: A dual wavelength fiber laser is provided, which does not need an additional pump light source for dual wavelength laser operation, and solves the problems of an insertion loss and a coupling loss of a pump light source without using a Mach-Zehnder waveguide coupler. CONSTITUTION: The first and the second active optical fiber(36,37) cause an inductive scattering as to a pump light source(100), and a WDM(Wavelength Division Multiplexing) fiber coupler(33) inputs a wavelength of the pump light source and outputs laser oscillation wavelengths(lambda1,lambda2) by being connected with the first and the second active optical fibers. The first resonator unit(38) comprises the first active optical fiber and short period gratings(31a,31b,31c) of the first group and oscillates the first wavelength(lambda1). The second resonator unit(39) comprises the second active optical fiber and short period fiber gratings(32a,32b) of the second group. A long period fiber grating(35) has a high loss as to the first and the second wavelength, and is located between two resonator units, and removes an interference between two resonator units. And a pump light source reflector unit(34) reflects a pump light(Ip) to be re-incident on the first and the second active optical fiber by being connected to a laser output port of the WDM fiber coupler.
Abstract:
본 발명은 다파장 광섬유 라만 레이저의 구도에 관한 것으로서, 비선형 광학 매질로서 펌프 광원에 대한 라만 산란을 유발시키는 광섬유와, 상기 광섬유의 라만 이득 파장 범위 내에서, 각기 다른 파장에 대한 선택적 반사 특성을 지닌 다수의 광섬유 회절격자 쌍을 이용한 공진기로 구성된다. 공진기를 구성하는 회절격자 쌍의 파장에 따른 반사 특성을 개별적으로 조절함으로써 발진하는 파장과 그 세기를 독립적으로 제어할 수 있다. 본 발명의 실시예로서 2차 스톡 주파수 천이된 두개의 파장들을 발진시키는 캐스캐이드 광섬유 라만 레이저를 제공한다. 본 실시 예에서 펌프 광원으로 1313 ㎚의 Nd:YLF 레이저를 사용하여, 1480 nm 와 1500 nm 에서 발진하는 라만 레이저를 구현하였다. 이와 같은 레이저는 광 증폭기의 펌프 광원으로 사용될 경우 증폭기의 이득 파장 영역을 확장시킴과 동시에 이득 평탄화를 능동적으로 구현 할 수 있다는 장점이 있다