Abstract:
PURPOSE: A multi-channel long wavelength VCSEL array and a fabricating method thereof are provided to form constantly an interval of a laser oscillation wavelength by controlling a resonant interval. CONSTITUTION: A multi-channel long wavelength VCSEL array includes a semiconductor substrate(10), a bottom mirror(20), an active region(30), a current limit layer(40), a superlattice control layer(50), and a top mirror(60). The bottom mirror is formed on the semiconductor substrate. The active region is formed on the bottom mirror. The current limit layer is formed on the active region in order to limit efficiently the current and enhance the efficiency of the heat transfer. The superlattice control layer is formed on the current limit layer in order to control an interval of laser oscillation wavelength. The top mirror is formed on the superlattice control layer.
Abstract:
PURPOSE: A method for fabricating an intracavity-contacted VCSEL including selective upper mirror layer growth is provided to simplify a heat emission path and a current injection path by using a selective region growth method. CONSTITUTION: A lower mirror layer(200), a laser resonance layer(300), a current injection hole forming layer, and an intracavity-contacted layer are sequentially grown on a substrate(100). An intracavity-contacted layer pattern(500) is formed by wet-etching the current injection hole forming layer. A mask pattern(600) is formed on the intracavity-contacted layer pattern(500). An upper mirror layer(250) is formed on an upper surface of the intracavity-contacted layer pattern(500). The first electrode(700) is formed on the intracavity-contacted layer pattern(500). The second electrode(750) is formed on a back surface of the substrate(100).
Abstract:
PURPOSE: A VCSEL(Vertical-Cavity Surface Emitting Laser) for long wavelength having a current caliber of an oxide layer is provided to minimize the loss of the current and the charges by using the InAlAs oxide layer for restraining the InAlAs current path layer. CONSTITUTION: An n-type lower mirror layer(120) and an active layer(130) are sequentially formed on an n-type InP substrate(110). The n-type lower mirror layer(120) satisfies a Bragg reflection condition. A current path layer(142) and a current limit layer(144) are formed on a part of the active layer(130). The current path layer(142) is surrounded by the current limit layer(144). A p-type internal resonance contact layer(150) is formed on the current path layer(142) and the current limit layer(144). An upper mirror layer(160) is formed on a part of the p-type internal resonance contact layer(150). A p-type electrode(170) is formed on the p-type internal resonance contact layer(150) and the upper mirror layer(160). An n-type electrode(180) is formed on a part of a back side of the n-type InP substrate(110).
Abstract:
PURPOSE: A vertical cavity surface emitting laser and a method of manufacturing the same are provided to minimize a generation of heat and to maximize a discharge of heat, which has a long wavelength and a thick inner resonance contact layer capable of realizing a current injection structure. CONSTITUTION: A lower mirror layer(5) is grown on a semiconductor substrate(6). An ion injection layer(8) is formed on a top of the lower mirror layer(5). An activated layer(3) is coated over the ion injection layer(8) of the mirror layer(5). An inner resonance contact layer(10) is covered on the activated layer(3). An undoped upper mirror layer(9) is formed on the inner resonance contact layer(10). The inner resonance contact layer(10) has a thermal conductivity of at least five times than that of the upper mirror layer(9) and a thickness of 0.7 times than that of the activated layer(3). An electrode(1) is coated on the upper mirror layer(9).
Abstract:
PURPOSE: A surface emitting laser for polarization control is provided to select oscillation light of polarized direction by controlling polarization without changing characteristic. CONSTITUTION: A surface emitting laser has a lower part mirror layer(32), resonance activity layer, upper part mirror layer(36). An insulation layer(37) gets inserted impurities-ion or fills up resonance activity layer after etching. The first upper part metal layer(38) gets supplied with current for lasering and is formed on the upper part mirror layer(36). The second upper part metal layer controls polarization to each vertical direction about the semiconductor board(31) with isolating the first upper part metal layer(38) from the insulating layer(37). The first lower part metal layer(41a) gets supplied with lasering current with the first upper part metal layer(38) at the same time and is formed on bottom of the semiconductor board(31). The second lower part metal layer(41b) gets supplied with polarization control current at the same time with the second upper part metal layer, keeping the fixed intervals with the first lower part metal layer(41a) on bottom of the semiconductor board(31).
Abstract:
본 발명은 광집적회로망 및 광통신 시스템을 구현하는데 요구되는 광결합기에 관한 것으로 더욱 구체적으로는 입사 신호광의 세기를 분배하여 출력단 광도파로 내부로 전달하는 집적형 광결합기 구조인 위상-격자 구조를 이용한 집적형 광결합기에 관한 것이다. 종래의 집적형 광결합기로는 스타-광결합기와 다중-모드 간섭 결합기가 알려져 있는데 상기 스타-광결합기는 신호광이 입사되어 출력단으로 전달되는 파워의 결합손실과 반사손실이 증가하는 단점이 있으며, 다중-모드 간섭 결합기는 출사광 사이의 위상이 동일하지 않고, 출력단 채널수 변화에 따라 소자의 크기가 변하고 출력단 채널 수가 제한되는 문제점이 있었다. 본 발명 집적형 광결합기는 입력단 광도파로(input optical waveguide) 구조와; 이 구조와 연결되는 자유 전파 평면 광도파로(free-propagation planar optical waveguide); 그리고 신호광이 공간적으로 충분히 회절되는 영역에 위상-격자 구조(phase-grating structure)를 제작하고, 위상-격자의 근접장 초점(near-field focal point) 배열에 출력단 광도파로(output optical waveguide) 채널을 두는 구조이며, 여기서 위상-격자 구조는 신호광의 위상을 정도로 변화시킬 수 있는 영역을 일정한 간격으로 배열하는 형태로서 입력단 광도파로를 통하여 자유-전파 평면 광도파로 영역으로 입사된 신호광은 회절 현상으로 인하여 충분한 거리를 진행한 이후에 광세기 분포가 거의 균일하게 되며, 회절 현상에 의하여 균일 광세기 분포를 가지도록 충분히 확산된 신호광은 위상-격자 구조에 의하여 집속되어 N 개의 초점 배열로 형성된다. N 개의 배열 형태로 집속된 신호광은 N 개의 채널 수를 갖는 출력단 광도파로 내부로 입사된다. 여기서 출력단 광도파로는 위상-격자의 초점 거리에 위치하므로 N 채널 출력단 내부로 신호광이 집속되므로서 결합 손실과 반사 손실이 거의 발생되지 않는다. 그리고 위상-격자의 주기를 조정하여 출력단 광도파로의 채널 수를 결정할 수 있으므로 소자의 크기는 출력단 채널 수와 무관하게 고정된다. 더욱이 광결합기의 크기가 200 - 300㎛ 정도로 매우 소형이므로 집적도를 크게 증대시킬 수 있다.
Abstract:
PURPOSE: An integrated typed optical coupler using phase-grating structure is to make a possible to effectively realize the connections among integrated typed optical wave guides and concentrate a signal light within the output optical wave guide. CONSTITUTION: An integrated typed optical coupler comprises: an input optical wave guide(10) having M channels; an output optical wave guide(40) having N channels; a free-propagation planar optical wave guide(20) connected to the input optical wave guide and the output optical wave guide; and a phase-grating structure(30) placed at a position where a signal light of the free-propagation planar optical wave guide is specially sufficiently diffracted. The phase-grating structure has the output optical wave guide at a near-field focal point thereof. The output terminal portion of the free-propagation planar optical wave guide is fabricated to have a semicircular structure having a point where the input optical wave guide and the free-propagation planar optical wave guide are connected, as the origin.
Abstract:
PURPOSE: A manufacturing method of surface emitting laser with shallow junction is provided to reduce serial resistance and to increase oscillation efficiency of the laser. CONSTITUTION: A lower mirror layer(2), an active layer(3), a current injecting layer, and an upper mirror layer are grown on a semiconductor substrate(1). A nonreflective layer(6) is deposited on the backside of substrate(1), and etched selectively to make a lower n-type electrode(7). After forming a photoresist pattern on the substrate(1), the selected part of upper mirror layer is etched to expose the current injecting layer, and a laser pole(9) is built. Boron ions are injected into an injection region(10), and the photoresist pattern is removed. A p-type electrode pattern(11) is formed by E-beam deposition of Pd/Mg or MN/Sb/Pd on the current injecting layer. Au is doped on the upper mirror layer, and an upper n-type electrode(12) is produced using a lift-off method. To isolate some part of the lower mirror layer(2), the current injecting layer and the active layer is dry etched.
Abstract:
본 발명은 반도체 광전 소자에 관한 것으로, 이중장벽 구조를 갖는 공명투과 다이오드의 양자 상태간의 에너지 차이를 최대로 하기 위하여 에미터쪽의 간격층에 인듐비소를 단원자층의 두께로 형성함으로써 약한 세기의 빛에서도 삼각 우물의 두 양자 상태에 의한 공명투과 전류가 분리되어 나타나므로 빛으로 삼각 우물의 여기 상태에 의한 공명투과를 제어하여 광원으로 전기적 신호를 제어하는 스위칭 소자의 제작이 가능할 수 있는 광 제어 공명투과 다이오드가 제시된다.