Abstract:
PURPOSE: A multi-stage bidirectional optical amplifier is provided, which is more economical than an optical amplifier using an additional mid-stage device per optical signal propagating bidirectionally, and can reduce a degradation of the signal due to a nonlinearity of the mid-stage device even though the number of optical signals inputted to the mid-stage device increases. CONSTITUTION: Single-stage bidirectional optical amplifiers(30a,30b) comprise two input/output ports(p1,p2) to amplify a downward/upward optical signal propagating bidirectionally and amplify the optical signal at the same time by being connected to the input/output port. Multi-reflection suppression units(28a,28b) are connected to input/output ports of the single-stage bidirectional optical amplifiers respectively, and transfer an optical signal of a specific wavelength toward one direction. And a mid-stage device(42) is connected between the multi-reflection suppression units, and comprises a unit for dispersive compensation, a unit for an optical amplifier gain flattering and a unit for noise accumulation removal of the optical amplifier.
Abstract:
PURPOSE: A method and a system for embodying a non-reciprocal optical wavelength filter are provided to have different periodical characteristics in accordance with propagation direction of a beam by damping reflection beams of respective directions using an optical wavelength filter having different transfer characteristics in both directions. CONSTITUTION: A faraday rotator has a non-reciprocal characteristics. The polarization status of a WDPC(Wavelength Dependent Polarization Converter) is varied in accordance with wavelength. Two birefringent crystals(BC1,BC2) split the polarization of an optical wave into two beams of orthogonal polarization using an anisotropic crystal. An RR(reciprocal rotator) rotates an incident optical wave in accordance with the propagation direction of the incident optical wave.
Abstract:
상보적 램프신호를 이용하여 A/D 변환을 수행하는 ADC 및 이를 적용한 이미지 센싱 장치가 제공된다. 본 발명의 실시예에 따른 이미지 센싱 장치는, 아날로그 픽셀값을 출력하는 픽셀, 픽셀에서 출력되는 아날로그 픽셀값을 샘플신호 앤드 홀드하여 샘플신호를 생성하는 S/H 및 S/H에서 생성된 샘플신호를 다수의 램프신호들과 비교하여 디지털화하는 ADC를 포함한다. 이에 의해, A/D 변환 속도를 증가시킬 수 있게 되어, 단위시간당 처리할 수 있는 픽셀값들의 개수 증가를 통해 고화질 영상을 지연 없이 제공하는 기틀을 마련할 수 있게 된다.
Abstract:
PURPOSE: An SHA (Sample and Hold Amplifier) for suppressing charge outflow at an internal device is provided to prevent the operation distortion of the SHA by suppressing the charge outflow at a switch which delivers an input signal to a charging device. CONSTITUTION: A switching unit (110) includes a plurality of switches (MN1-7, MP1-3), an inverter (I) and a capacitor (C1). The switching unit delivers an input signal to a charging unit. The charging unit charges the input signal delivered through the switching unit. A charge outflow suppressing unit (130) includes a micro-inductor (ML). The charge outflow suppressing unit suppresses the charge outflow at the switching unit.
Abstract:
The present invention discloses a wide band optical amplifier with a common mid-stage device. In the wide band optical amplifier according to the present invention, the signals that enter the amplifier are first split into a couple of sub-band signals. The sub-band signals are amplified independently at different optical amplification sections, but they share a common mid-stage device, which reduces the complexity and the cost of the amplifier. The sub-band signals propagate count-directionally in the common mid-stages device to reduce the nonlinear interactions between the signals in different sub-bands. A wide band optical amplifier incorporating a common mid-stage device with directionality is also disclosed.
Abstract:
PURPOSE: A 4 port wavelength selective router is provided, which can suppress multi reflective light limiting a performance of a bidirectional optical transmission apparatus, and can separate or combine a bidirectional optical signal effectively. CONSTITUTION: The 4 port wavelength selective router(4pr) has four input/output ports(1,2,3,4). There is an optical light connection path between three port pairs((1,2),(2,3),(3,4)), and there is no optical light connection path between another three port pairs((1,3),(2,4),(1,4)). Optical waves comprising two groups(A group,B group) comprising one or two optical waves of different wavelength are inputted/output to/from the port(2), and optical waves of the same wavelength as the above optical waves inputted/output to/from the port(2) are output/inputted from/to the port(3). The method to separate the optical wave groups being inputted/output to/from the port(2) and the port(3) is a band division method or a wavelength interleaving method.
Abstract:
본발명은파장분할다중방식광통신용광원에관한것으로, 특히외부에서주입되는비간섭성광에파장잠김된페브리-페롯레이저다이오드를이용한파장분할다중방식광통신용광원에관한것이다. 본발명에따른광원은단향관이없는페브리-페롯레이저다이오드에좁은대역의비간섭성광을주입하여구현된다. 문턱전류이상의전류가인가된페브리-페롯레이저다이오드에좁은대역의비간섭성광을외부에서주입하면여러발진모드들중 주입되는비간섭성광의파장과일치하지않는모드들은억제되고, 페브리-페롯레이저다이오드의출력은주입된비간섭성광과동일한파장에고정된다. 또, 비간섭성광의주입을통해출력파장이고정된페브리-페롯레이저의인가전류를직접변조함으로써정보를실은광신호를생성한다. 하나의비간섭성광원의출력을도파로격자라우터를통해스펙트럼분할한후, 스펙트럼분할된비간섭성광을다수의페브리-페롯레이저다이오드들에동시에주입하므로써파장분할다중화된다수의광신호를경제적으로생성할수 있다. 이때, 각페브리-페롯레이저다이오드의출력파장은라우터의통과대역을조절하여손쉽게제어할수 있다. 이러한특성으로인해본 발명의광원은출력파워가비교적크고, 경제성이우수하며, 파장제어가용이한장점이있다.
Abstract:
PURPOSE: An optical cross connector is provided to achieve easy maintenance/management and efficiently cope with development of a transmission network owing to hierarchical modulation. CONSTITUTION: An optical cross connector comprises a plurality of splitters, coupled to input optical fibers one by one, for distributing input signals; a drop link module having a plurality of input terminals coupled to a divider one by one and a plurality of output terminals coupled to the output optical fiber one by one; and a plurality of transmission link modules having a plurality of input terminals coupled to a connector one by one and a plurality of output terminals coupled to one output optical fiber for transporting signals to a node.
Abstract:
Disclosed is a personal electronic dosimeter using multiple single channel analyzers. The personal electronic dosimeter, according to embodiments of the present invention, uses more than two single channel analyzers in order to form an energy window based on the radiation energy level of the radiation source, or form a reference level value greater than two. Through the reference level value, a radiation signal can be recognized, so as for a user to measure radiation of various sources, and calculate a reliable dose. [Reference numerals] (AA) Radiation energy; (BB) Time