Abstract:
PURPOSE: A pump light coupling device and an active optical module including the same are provided to increase or maximize adhesion efficiency of optical fiber. CONSTITUTION: First optical fiber(10) transfers pump light. Second optical fiber(20) comprises cladding and guides the pump light transferred by the first optical fiber. The cladding has a cross section expended from a first diameter to a second diameter. A hollowed optical block(30) comprises a penetration hole, an incidence surface, and an adhesion surface. The cladding passes through the penetration hole. The incidence surface is connected to the first optical fiber at one end portion of the penetration hole. The adhesion surface is welded to a cross section of the second optical fiber at the other end portion which is faced in the incidence surface.
Abstract:
PURPOSE: An optical coupler and an active optical module including the same are provided to efficiently supply pump light by totally reflecting the pump light from the inner reflection surface. CONSTITUTION: A hollow optical block(30) has a penetration hole(32) through which an optical fiber passes. Light is transmitted to an incident surface from the lower side of the hollow optical block in parallel to the penetration hole. An inner reflection surface reflects light to the inside of the hollow optical block from the incident surface. At least one tapered area concentrates light on an optical fiber(20) of the penetration hole.
Abstract:
PURPOSE: A multi-wavelength laser diode, a multi-wavelength laser diode module, and a wavelength division multiplexing optical communication system are provided to make the output wavelength of a multi-wavelength laser diode be identical to the external reference wavelength of the multi-wavelength laser diode. CONSTITUTION: First light amplifiers(110) generate and amplify first to nth wavelength signals, and a second wavelength amplifier(120) generates and amplifies a monitor wavelength signal. A wavelength selector(150) selects and outputs the amplified monitor wavelength signal and the amplified first to nth wavelength signals. An optical detector(140) detects the reflection wavelength signal of the monitor wavelength signal outputted from the wavelength selector.
Abstract:
PURPOSE: A resonator of a hybrid laser diode is provided to minimize the effect of a surface bonding by widening the width of the compound semiconductor waveguide of the resonator. CONSTITUTION: A substrate includes a semiconductor layer in which a waveguide for a hybrid(120h), a multiple mode waveguide(122), and a single mode waveguide(126) are serially connected. A compound semiconductor waveguide(210) is arranged on the waveguide for the hybrid of the semiconductor layer. A tapered coupling structure(210t), which is overlapped with a part of the multiple mode waveguide, is formed on one end of the compound semiconductor waveguide. A reflective unit(128) is arranged on one end of the single mode waveguide.
Abstract:
도파로 구조체 및 배열 도파로 격자 구조체를 제공한다. 이 배열 도파로 격자 구조체는 입력 스타 커플러, 출력 스타 커플러 및 입력 및 출력 스타 커플러들을 광학적으로 연결하는 복수개의 배열 도파로들을 구비한다. 이때, 배열 도파로들 각각은 높은 한정 인수를 갖는 적어도 하나의 구간 및 낮은 한정 인수를 갖는 적어도 두개의 구간들을 포함하고, 배열 도파로들의 높은 한정 인수를 갖는 구간들은 동일한 구조를 갖도록 형성된다.
Abstract:
실리콘층 및 화합물 반도체층을 각각 슬랩 도파로 및 채널 도파로로 이용하는 하이브리드 레이저 다이오드가 제공된다. 본 발명에 따른 하이브리드 레이저 다이오드는 도파 모드의 손실, 누설 전류 및 직렬 저항을 줄일 수 있으며, 개선된 열 방출 특성을 갖는다. 특히, 본 발명에 따르면, 활성영역 및 도파로가 분명하게 정의될 수 있다.
Abstract:
본 발명은 확산 현상을 이용한 수직 테이퍼 형성방법에 관한 것으로, 기판 상부에 도파로 하부 주변층, 도파로 중심층, 도파로 상부 주변층 및 선택적 식각층을 순차적으로 형성하는 단계, 선택적 식각층의 상부에 긴 띠 형태의 식각 마스크를 형성하는 단계, 선택적 식각 용액을 이용하여 선택적 식각층을 식각 마스크 안쪽으로 일정 부분 식각하여 모세 평판을 형성하는 단계 및 확산속도지배 식각 용액을 이용하여 상기 도파로 상부 주변층을 일정 부분 식각하는 단계를 포함한다. 따라서, 모세평판 구조를 이용한 식각으로 수직 테이퍼를 만들기 때문에 도파로 간의 간격에 어떤 제한이 없어 광소자의 집적도를 높일 수 있는 효과가 있다.
Abstract:
PURPOSE: A semiconductor optical device with differential-grating is provided to fabricate an optical device including grating without using expensive equipment and form a self-pulsating distributed feedback(DFB) laser diode of high yield by using a holography method capable of increasing fabricating yield of the optical device. CONSTITUTION: An n-type InP substrate(10) is prepared. A stacked structure including a waveguide layer(22) and an active layer(26) is formed on the InP substrate. The first grating(12a) is formed under the stacked structure on the InP substrate. The second grating(32a) is formed on the stacked structure. An n-type InP clad layer(20) is further included between the first grating and the stacked structure. A p-type InP clad layer(30) is further included between the stacked structure and the second grating.