Efficient 1*16 optical power splitter based on InP

An InP-based 1*16 optical power splitter is demonstrated. The device has 250 mu m spaced output channels and a total length of 5.1 mm. This small size was realised by using a free-space radiative input-output coupling and specially designed 1.85 mm curvature S-bends. The worst case excess loss for TM and TE polarised light is 3 dB.<>     

Design and fabrication of silica-based integrated-optic 1*128 power splitter

A 1*128 optical power splitter is fabricated by integrating 127 Y-branch waveguide elements on a 3 inch silicon wafer using silica waveguide technology. The average measured excess loss of this splitter is 3.2 dB including fibre-waveguide coupling loss.<>     

A novel 1*8 optical power splitter using tapered waveguide coupling

The performance of a novel 1*8 optical power splitter is demonstrated. Consisting of seven three-guide power couplers connected in a cascade manner, the splitter has a relatively short length of 11 mm. The use of a tapered waveguide in the constituent couplers should make it possible for this power splitter to provide a wide bandwidth and little polarization dependence. Also it has the advantage of strong tolerance to the waveguide parameter deviation.<>     

Silicon bipolar 1:16-demultiplexer for 10 Gbit/s fibre opticcommunication system

A 1:16-demultiplexer based on silicon bipolar 1:4-demultiplexer ICs, which include all requirements for system applications, has been designed and tested. The authors report the design of the 1:4-demultiplexer, which operates up to 14 Gbit/s, and experimental results for the 1:16-demultiplexer at 10 Gbit/s     

Y branching silica waveguide 1*8 splitter module

Silica waveguide Y branching 1*8 splitters were fabricated and found to be highly reliable after housing. The silica waveguide has a splitting excess loss of 0.57 dB. The packaged device has a housing excess loss of 0.89 dB. The measured return loss was over 50 dB above room temperature. The loss deviation under heat cycle testing was 0.46 dB in the temperature range -20-+70 degrees C.<>     

Selfaligned fibre pigtailed surface emitting lasers on Si submounts

A selfaligned packaging technique using Si submounts for potentially low cost fabrication of discrete and array fibre pigtailed surface emitting lasers is reported. Essentially 100% coupling efficiency and more than 0.5 mW output power multimode fibre pigtailed laser packages were demonstrated.<>     

Integrated-optic 1×128 power splitter with multifunnelwaveguide

An integrated-optic 1×128 power splitter is demonstrated. It is composed of a slab waveguide, funnel-shaped waveguides, and output waveguides. Input light from a fiber is diffracted in the slab waveguide and received by funnel waveguides. To achieve uniform power splitting, the width of the funnel waveguides is designed based on the Gaussian diffraction pattern; that is the funnel widths increase progressively away from the center. The splitter is fabricated with GeO₂-doped silica waveguides on silicon. The 1×128 splitting is achieved with a low excess loss of 2.3 dB and a small standard deviation of 0.63 dB     

可调光功率分配器的应用

介绍了光迅科技有限责任公司研发的宽范围可调光功率分配器,描述了该产品在光纤到户(FTTH)、光线路保护和各种光网络中的可能应用。     

Multimode interference-based photonic crystal waveguide power splitter

A compact power splitter based on the multimode interference (MMI) effect in photonic crystal waveguides is designed and analyzed. The device size reduction compared with the conventional MMI power splitter can be attributed to the large dispersion of the photonic crystal waveguides. The Massachusetts Institute of Technology Photonic-Bands code is used to calculate the band structures of photonic crystal waveguides. The finite-difference time-domain method is adopted to simulate the relevant structures.     

Broadband folded Wilkinson power combiner/splitter

A new folded Wilkinson power combiner/splitter has been realized at millimeter-wave frequency with an area that is one half that of the standard two-stage Wilkinson power combiner. The new splitter has an insertion loss of 5dB, an isolation of 15dB and a return loss 15dB from 15 to 45GHz.     

A gigabit multidrop serial backplane for high-speed digital systems based on asymmetrical power splitter

The maximum data rate in today's available multidrop backplanes is significantly limited due to signal integrity concerns. In this brief, a novel gigabit multidrop serial link configuration for high-speed digital systems based on newly developed asymmetrical broadband power splitters with matching trace impedance, is presented. The proposed power splitter features good impedance match at all ports without the insertion losses being inherent to common resistive power splitters. Experimental results obtained from implemented prototypes demonstrate a satisfactory operation of the proposed multidrop serial backplane for a data rate above 3.5 Gbps.     

Performance tuning of 1*7 wavelength-flattened fused fibre couplers

In order to successfully fabricate monolithic 1*7 wavelength-flattened couplers, careful control over the degree of fusion of the structure is required. The variation of coupling characteristics with the degree of fusion is discussed. Two degrees of fusion are identified where an equal power split wavelength-flattened response may be obtained.<>     

A multimode interference-based variable power splitter in GaAs-AlGaAs

Bent multimode interference-based variable power splitters are experimentally demonstrated in GaAs-AlGaAs using the principles of general imaging. Simulations are used to investigate sensitivities to device geometry. Results indicate that the device's splitting ratio performance is largely fabrication tolerant.     

多平行光子晶体波导耦合分束器

将多光子晶体单模波导平行、邻近放置构成定向耦合器.基于自成像效应的波导多模偶合,提出了一种二维光子晶体波导四端口分束器.采用时域有限差分法和平面波法作为研究工具,在偶合长度L=7a的长度下,研究了调节介质柱半径R,使耦合区电磁场的相位分布发生变化,从而实现四个输出端口的光强度自由分配.     

Active N coupled waveguide switch and power splitter

A voltage controlled N coupled waveguide array is studied. N voltages are applied, each one to an individual wave-guide and a diversity of power routing and switching functions are investigated. The approach is based on numerical optimization of the output power distribution for each of the required switching or power splitting functions. The search is performed in the N-dimensional space of the voltage induced index changes. Extinction ratios better than -16 dB are demonstrated for all configurations studied. Two methods for further improving the performance of the device are also discussed. It is shown that the device can accomplish some parallel non-blocking switching functions. The mathematical formalism, based on coupled-mode theory is detailed     

Silicon 1*2 digital optical switch using plasma dispersion

The first silicon 1*2 digital optical waveguide switch which relies on free-carrier plasma dispersion and the waveguide-vanishing effect is demonstrated. Operation is demonstrated at a wavelength of 1.3 mu m.<>     

基于硅微机械加工波导W波段功率合成放大器

基于硅微机械加工工艺,设计并制作一款W波段4路硅基波导功分/合成器.通过在8英寸的硅晶圆上采用干法刻蚀和晶圆级键合等工艺途径实现了硅基波导结构.根据硅微机械加工工艺的特点,设计了一种基于H面T型结和3dB耦合桥结构的波导功分/合成器.该功分/合成器表现出的损耗为0.25 dB.最后,采用该硅基功分/合成器对4只2W的G...     

Ytterbium-doped large-core fibre laser with 1 kW of continuous-wave output power

A ytterbium-doped fibre laser with up to 1 kW of continuous-wave output power at 1.09 /spl mu/m with a slope efficiency of 80% and a good beam quality (M/sup 2/=3.4) is reported. The fibre was pumped by two diode-stack sources launched through opposite ends. No undesirable roll-over was observed in output power with increasing pump power.     

Polarization splitter based on antiresonant reflecting opticalwaveguides

We propose the first polarization splitter based on antiresonant optical waveguides (ARROW's). The three air core structure is built up of two moveable outer cladding layers and two fixed inner cladding layers. The moveability of both outer cladding layers makes micromechanical switching of the polarized light between two output channels possible. The polarization discrimination is realized through thin metal films deposited on the outermost surfaces of the outer cladding layers. The extinction ratios of channels 1 and 3 as a function of the thickness of all cladding layers are calculated. We found that for extinction ratios below -20 dB thickness fluctuations smaller than ±15 mm are allowed