Splitter

About: Splitter is a research topic. Over the lifetime, 5123 publications have been published within this topic receiving 39163 citations.

Optical time domain reflectometry (OTDR) trace analysis in PON systems

Abstract: A client unit and a method are provided performing fault analysis in a Passive Optical Network, PON, by using Optical Time Domain Reflectometry, OTDR. The method comprises triggering a new OTDR measurement, wherein a previous reference measurement has been made indicating an original state of the PON. The method further comprises inserting an OTDR measurement signal into a multistage splitter before a last splitter stage of the multistage splitter, and wherein the last splitter stage is of ratio 2:N; and obtaining at least one new event location based on the OTDR measurement signal. Further, the method comprises calculating a fault magnitude at a given location by subtracting an event magnitude obtained from the new OTDR measurement from the reference OTDR measurement and taking into account the number of drop links connected to the last splitter stage in the reference measurement and the new measurement. Thereby, determination of position and severity of the fault locations is enabled.

ADSL integrated line card with digital splitter and POTS CODEC without bulky analog splitter

Abstract: An integrated line-card terminates an asymmetric digital-subscriber line (ADSL) copper-pair at a single point in a central office. The line card contains analog line circuitry such as a ring generator, off-hook detector, D.C. current feed, and a single analog-digital (A/D) converter. The phone line carries a composite signal of both the high-frequency ADSL data and the low-frequency voice or plain-old-telephone-service (POTS) signal. Instead of using an analog frequency-splitter with bulky, expensive inductor coils, a digital splitter is used. A digital-signal processor (DSP) can be used to perform the digital splitting of ADSL and POTS. The waveforms from the analog phone line are first converted to digital values by the A/D converter, and then a digital splitter separates the low-frequency POTS from the high-frequency ADSL. The ADSL data is formatted by the DSP for a data pathway to the Internet, while the POTS data is converted by the DSP to A-Law or C-Law for transmission over the telephone network's PCM highway. The DSP can perform all decoding, encoding, compression, and formatting needed by both ADSL and POTS. The quality of the phone line is improved by having a single termination point at the central office, rather than separate termination points for POTS and ADSL data from the phone line.

Auxiliary transmission section

Abstract: An auxiliary transmission section (102) for a compound transmission (100) is provided having three gear layers, combined range and splitter gearing and four distinct selectable auxiliary section ratios. The auxiliary transmission section includes an auxiliary section input shaft (28A), an output shaft (122), an auxiliary countershaft assembly (104), splitter (118), splitter/range (120) and range (124) gears, a two-position splitter clutch (126) rotationally fixed to the auxiliary section input shaft for coupling either the splitter gear or splitter/range gear to the auxiliary section input shaft and a two-position synchronized range clutch (128) rotationally fixed to the output shaft for coupling either the range/splitter gear or the range gear to the output shaft.

Three-dimensional integrated optics using polymers

Abstract: Some of the key components are demonstrated to make three-dimensional (3-D) optical integrated circuits possible using polymers. Fabrication techniques of shadow reactive ion etching, shadow photolithography, and gray-level photolithography to produce complex 3-D integrated optic structures are demonstrated. Vertical waveguide bends exhibit excess losses of <0.3 dB, and vertical power splitters possess predictable output splitting ratios between multiple core levels with excess losses of <0.5 dB. Vertical polarization splitters exhibit power extinction ratios of 15 dB between the output core layers. A 1/spl times/4 vertical-horizontal power splitter is also demonstrated. Additionally, these techniques are used to integrate different polymer materials into the same optical circuit while easily solving the mode mismatch problem. To show the technique, a polymer electrooptic modulator is vertically integrated with a low-loss waveguide.

Airy beam induced optical routing

Abstract: We present an all-optical routing scheme based simultaneously on optically induced photonic structures and the Airy beam family. The presented work utilizes these accelerating beams for the demonstration of an all-optical router with individually addressable output channels. In addition, we are able to activate multiple channels at the same time providing us with an optically induced splitter with configurable outputs. The experimental results are corroborated by corresponding numerical simulations.