40 Gbit/s transmission over photonic crystal fibre using mid-span spectral inversion in highly nonlinear photonic crystal fibre

Transmission at 40 Gbit/s over large mode area photonic crystal fibre (PCF) together with dispersion compensation by optical phase conjugation in a highly nonlinear PCF are demonstrated for the first time.     

10 Gbit/s transmission over air-guiding photonic bandgap fibre at 1550 nm

The first data transmission over air-guiding photonic bandgap (PBG) fibre is demonstrated. A 10 Gbit/s signal was successfully transmitted at 1550 nm over 150 m of singlemode PBG fibre, thus demonstrating their applicability to optical communications. Furthermore, the impact of the polarisation properties of PBG fibres is highlighted experimentally.     

反常色散区抽运光子晶体光纤产生的超连续谱

为了研究反常色散区抽运光子晶体光纤产生的超连续谱,采用分步傅里叶方法数值模拟了飞秒激光脉冲在光子晶体光纤反常色散区中的非线性传输和超连续谱产生.结果表明,初始激光脉冲的峰值功率和脉冲初始啁啾对光子晶体光纤反常色散区产生超连续谱形状和带宽是有影响的.这些结论给光子晶体光纤中产生超连续谱提供了参考.     

160 Gbit/s OTDM signal transmission over 26 km photonic crystal fibre

A 160 Gbit/s (=10 Gbit/s X 16) optical time-division multiplexing (OTDM) signal is successfully transmitted over a 26 km-long photonic crystal fibre (PCF). The transmission induced signal pulse broadening is suppressed to only 0.2 ps (from 2.1 to 2.3 ps) because the fabricated PCF has low polarisation-mode dispersion (PMD) of 0.1 ps/km^1/2, and the total chromatic dispersion of the transmission line is suppressed to 0.015 ps/nm by using a dispersion-compensation fibre. The transmitted signal is demultiplexed using four-wave mixing in a 100 mlong dispersion shifted fibre, where a phase modulation-based 10 GHz pump pulse source is newly adopted.     

Simulation investigation on supercontinuum generation and noise characteristics in the normal dispersion photonic crystal fiber with a flattened dispersion profile

The propagation of picosecond pulses in the normal dispersion photonic crystal fiber(PCF) with a flattened dispersion profile is numerically investigated.The characteristics of the amplitude and phase noise in the supercontinuum generation(SCG) are also analyzed through the coherent sliced supercontinuum(SC).The effects of self-phase modulation(SPM) and four-wave mixing(FWM) on broadening of the pulse spectrum are presented,and the best amplitude and phase noise performance with a specific fiber length is o...     

Impact of polarisation mode dispersion on 10 Gbit/s terrestrialsystems over non-dispersion-shifted fibre

Depending on the launched state of polarisation 10 Gbit/s system impairments are investigated experimentally in the presence of chromatic dispersion and variable differential group delay caused by polarisation mode dispersion. In addition an actual fibre cable, not an optical simulator was used to bring polarisation mode dispersion     

Design of nonlinear photonic crystal fibers with ultra‐flattened zero dispersion for supercontinuum generation

The study reports on the design and performance of two air‐filled and two partial ethanol‐filled photonic crystal fiber (PCF) structures with a tetra core for supercontinuum generation. The PCFs are nonlinear with ultra‐flattened zero dispersion. Holes with smaller areas are used to create a tetra‐core PCF structure. Ethanol is filled in the holes of smaller area while the larger holes of cladding region are air‐filled. Optical properties including dispersion, effective mode area, confinement loss, normalized frequency, and nonlinear coefficient of the designed PCF structures are investigated via full vector finite difference time domain (FDTD) method. A PCF structure with lead silicate as wafer exhibits significantly better results than a PCF structure with silica as wafer. However, both structures report dispersion at a telecommunication wavelength corresponding to 1.55 μm. Furthermore, the PCF structure with lead silicate as wafer exhibits a very high nonlinear coefficient corresponding to 1375 W^?1 km^?1 at the same wavelength. This scheme can be used for optical communication systems and in optical devices by exploiting the principle of nonlinearity.     

Dispersion compensation over 270 km at 10 Gbit/s using anoffset-core chirped fibre Bragg grating

A 120 mm long fibre Bragg grating, adjustably chirped by an offset-core technique, compensates for dispersion in a 10 Gbit/s optical communication system operating at 1054 μm over 270 km of non-dispersion-shifted fibre. Simultaneous compensation of fibre dispersion and source chirp in a directly modulated system is also described     

1 Tbit/s km transmission experiment at 16 Gbit/s using conventional fibre

Describes a single-channel optical transmission experiment that achieved a bit rate-distance product of 1 Tbit/s km over conventional (non-dispersion-shifted) fibre. The transmitter was a directly modulated, 1.3 mu m-wavelength, distributed feedback laser. The receiver employed a semiconductor optical preamplifier and a high-impedance pinHEMT front-end.<>     

PMD compensation using birefringence photonic crystal fiber in 40Gbit/s optical communication system

A birefringence photonic crystal fiber is used for PMD compensation in a single-channel 40Gbil/s-speed optical communication system with CSRZ format. The experimental results of transmission show that the PMD compensation system works effectively.     

80 Gbit/s simultaneous photonic demultiplexing based on OTDM-to-WDMconversion by four-wave mixing with supercontinuum light source

A novel method for all-optical all-channel simultaneous demultiplexing based on OTDM-to-WDM conversion by four-wave mixing with a highly chirped rectangular shaped supercontinuum source is proposed. Error-free 80 to 10 Gbit/s demultiplexing operation in eight channels is experimentally demonstrated     

All-optical wavelength conversion at 160 Gbit/s using SOA and silicon-on-insulator photonic circuit

Error-free operation of an all-optical wavelength converter at 160 Gbit/s based on a semiconductor optical amplifier and a silicon-on-insulator photonic circuit, consisting of two cascaded Mach-Zehnder delay interferometers, is demonstrated.     

10 Gbit/s, 1200 km error-free soliton data transmission using erbium-doped fibre amplifiers

Soliton data signals at 10 Gbit/s have been successfully transmitted for the first time through a 1200 km dispersion-shifted fibre by using 24 erbium-doped fibre amplifiers. A bit error rate below 10/sup -13/ was obtained with 2/sup 20/-1 pseudorandom patterns.<>     

10 Gbit/s dispersion supported transmission field trial over 123 kmstandard singlemode fibre for HDTV studio interconnection

A bidirectional studio interconnection system operating at 10 Gbit/s over 123 km installed standard singlemode fibre is presented. Uncompressed HDTV programme channels are transmitted in STM-format without an in-line repeater, using the dispersion supported transmission (DST) method     

8 Gbit/s 202 km optical CPFSK transmission experiment using 1.3 mu m zero dispersion fibre

A wideband microstrip line delay equaliser and a wideband optical balanced receiver for multi-Gbit/s transmission were proposed. Using these devices, an 8 Gbit/s 202 km optical CPFSK transmission experiment with a 1.3 mu m zero dispersion fibre was conducted at the wavelength of 1.55 mu m. Fibre chromatic dispersion was successfully compensated by the equaliser.<>     

Vestigial sideband filtering at 10 Gbit/s using 12.5 GHzchannel-spacing demux

A 32-channel 12.5 GHz-spaced free-space demux with low crosstalk and low polarisation dependent loss has been constructed. Using this demux, vestigial sideband filtering at 10 Gbit/s has been studied. It is shown that this demux can achieve very high spectral efficiency without polarisation division multiplexing     

Penalty-free 2.5 Gbit/s photonic switching using a semiconductorfour-gate-array module

A penalty-free photonic switching experiment at 2.5 Gbit/s using a gate-array module of four semiconductor optical amplifiers, flip-chip-mounted on a silicon motherboard and provided with highspeed electronic drivers, is reported for the first time. Switching times shorter than 400 ps are obtained, allowing for guardbands as short as two bits between consecutive cells     

16 Gbit/s fibre transmission experiment using optical time-division multiplexing

An experimental four-channel optical time-division multiplexed transmission system is described, and the first demonstration of fibre transmission at a bit rate of 16Gbit/s is reported. In this experiment, data at 16Gbit/s have been transmitted over 8 km of fibre with a bit error rate below 10-9.     

High-performance 40 Gbit/s fibre Bragg grating tunable dispersion compensator fabricated using group delay ripple correction technique

A recently proposed UV correction method is used to reduce group delay ripple in a chirped fibre grating tunable dispersion compensator. In 43 Gbit/s CSRZ system tests, the corrected grating had less than 0.5 dB OSNR penalty over the tunable dispersion range of 270 to 750 ps/nm.     

10 Gbit/s D flipflop using AlInAs/InGaAs

It is demonstrated that high speed circuits can be achieved in InGaAs HBT technology with relaxed transistor design rules. A 10 Gbit/s D flipflop has been realised using HBTs with a base thickness of 1500 AA and collector thickness of 5000 AA and with 4 mu m emitter stripe width.<>