An AWG-based 10 Gbit/s colorless WDM-PON system using a chirp-managed directly modulated laser

We propose an arrayed waveguide grating(AWG)-based 10 Gbit/s per channel full duplex wavelength division multiplexing passive optical network(WDM-PON).A chirp managed directly modulated laser with return-to-zero(RZ) differential phase shift keying(DPSK) modulation technique is utilized for downlink(DL) direction,and then the downlink signal is re-modulated for the uplink(UL) direction using intensity modulation technique with the data rate of 10 Gbit/s per channel.A successful WDM-PON transmission operation with the data rate of 10 Gbit/s per channel over a distance of 25 km without any optical amplification or dispersion compensation is demonstrated with low power penalty.     

A WDM-PON with DPSK modulated downstream and OOK modulated upstream signals based on symmetric 10 Gbit/s wavelength reused bidirectional reflective SOA

We investigate a wavelength-division-multiplexing passive optical network (WDM-PON) with centralized lightwave and direct detection. The system is demonstrated for symmetric 10 Gbit/s differential phase-shift keying (DPSK) downstream signals and on-off keying (OOK) upstream signals, respectively. A wavelength reused scheme is employed to carry the upstream data by using a reflective semiconductor optical amplifier (RSOA) as an intensity modulator at the optical network unit (ONU). The constant-intensity property of the DPSK modulation format can keep high extinction ratio (ER) of downstream signal and reduce the crosstalk to the upstream signal. The bit error rate (BER) performance of our scheme shows that the proposed 10 Gbit/s symmetric WDM-PON can achieve error free transmission over 25-km-long fiber transmission with low power penalty.     

30 Gbit/s downstream capacity of cost-effective colourless WDM-PON based on injection-locked Fabry-Perot lasers

A 100 GHz spaced comb, generated by a quantum dash passively modelocked laser, is used as a low-noise coherent seeding source for the colourless wavelength-division-multiplexed passive optical network based on injection-locked Fabry-Pe rot laser diodes. Error-free downstream transmission over 25 km singlemode fibre of 12 WDM channels at 2.5 Gbit/s with 100 GHz channel spacing is experimentally demonstrated.     

A novel AWG-based WDM-PON architecture with full protection capability

The higher bandwidth utilization of wavelength-division-multiplexing passive optical networks (WDM-PONs) can be problematic if the link failure is not repaired in a timely manner since major data losses may occur in the event of link failure. Therefore, developing robust WDM-PON architectures with an effective protection capability is an essential task when designing optical access networks. Although the literature contains many proposals for WDM-PON protection schemes, the majority of these schemes protect either the feeder fibers or the distribution fibers, but not both. By exploiting the cyclic properties of the AWG and establishing appropriate interconnections between matched pairs of ONUs such that one ONU in the pair can use the distribution fiber assigned to its partner for backup purposes, the proposed scheme can protect both the feeder fibers and the distribution fibers through the designated protection streams in feeder fiber 3. Additionally, five operational modes of the proposed scheme are detailed with the proposed wavelength assignment scheme, the operational sequence, and the operation flow chart of decision circuit in the ONU/OLT. The analytical results have shown that the proposed scheme not only provides a full protection capability for WDM-PON networks, but also has a lower unavailability, a lower construction cost, and a reduced wavelength requirement than existing representative protection schemes. Finally, an analysis of the power budget and the recovery time has confirmed the practical feasibility of the proposed scheme.     

10 Gbit/s singlemode operation of two-dimensional-latticedistributed reflector laser

A single longitudinal mode laser has been produced using a two-dimensional-lattice distributed reflector grating. The device exhibits singlemode suppression ratios of >27 dB with a small signal bandwidth of 11 GHz and stable spectra under modulation at 10 Gbit/s     

一种10 Gbit/s光接收机前置放大器

基于0.18 μm BiCMOS工艺,设计了一种适用于光纤通信的10 Gbit/s光接收机前置放大器。电路由跨阻放大器、两级可变增益放大器、缓冲器、直流偏移消除电路、峰值探测器和自动增益控制环路组成。跨阻放大器采用并联-并联负反馈结构,在满足增益、带宽要求前提下实现低噪声特性。后级放大器引入了增益可变控制,获得宽输入动态范围,同时采用电容简并技术提升带宽。版图后仿真结果表明,在小信号光电流输入下,放大器的差分跨阻增益为10.7 kΩ,-3 dB带宽为7.4 GHz,平均等效输入噪声电流密度为16.9 pA/Hz。可调增益范围在25.2~80.6 dBΩ内,输入动态范围超过40 dB。在3.3 V电压下,静态功耗为166 mW,版图尺寸为764 μm540 μm。     

2 Gbit/s small form factor fiber-optic transceiver for single modeoptical fiber

Small form factor (SFF) optical transceivers are expected to be commonly used in the near future for high-end (high bit-rate, single mode) applications as well as for low-cost applications. SFF optical transceivers require new packaging techniques for the optical portion, because the distance between input and output optical axes is much smaller than those of conventional transceivers, e.g., the “1by9” type. Two types of optical packaging are introduced, both of which are suitable for transceivers which have an MT-based receptacle for single mode applications. One of the packaging types, a fiber-bulk structure, takes full advantage in cost and reliability of standard, hermetically sealed TO-canned optical devices. A conventional TO-can packaged laser diode (LD) and photodiode (PD) are held with short optical fibers by low-cost, injection-molded polymer retainers. The short fibers are connected to an MT ferrule inside the transceiver. An alternative packaging type, a surface mount structure, is intended for drastic cost reduction in large volume production by using advanced highly integrated assembly. An LD chip with an integrated spot-size converter and a waveguide-structured PD chip are mounted on a Si-substrate. Optical coupling between the optical devices and fibers on V-groove is accomplished by passive alignment, which reduces assembling time. A prototype transceiver with an MPO receptacle has been developed using the former packaging structure. Evaluated results show performance which complies with the 2.125 Gbit/s Fiber Channel standard. SFF transceivers with these new packaging technologies are expected to increase the optical port density and also to reduce the cost of high-end systems with bit rate of 2 Gbit/s or higher per port     

基于10Gbit/s传输的光纤旁路系统平台研究与设计

本文基于MPC8308ERDB设计了一款基于10Gbit/s传输的光纤旁路保护器,用于保护接入骨干网的节点设备,重点分析了针对MPC8308ERDB开发板的u-boot移植过程中的关键问题。凭借U-boot对PowerPC系列处理器最为丰富的支持,结合飞思卡尔提供的BSP源代码包,详细地分析了u-boot源代码的编译及配置过程,重点分析了u-boot的移植过程。     

Single fiber colorless symmetric WDM-PON architecture using time interleaved remodulation technique for mitigating Rayleigh backscattering resilience

A time interleaved differential phase shift keying (DPSK) remodulation technique is proposed to mitigate the effect of Rayleigh backscattering (RBS)-induced noise in a single fiber colorless wavelength-division-multiplexing passive optical network (WDM-PON). In order to achieve a cost effective optical network unit (ONU) solution without dedicated laser sources for upstream signals to provide optimum symmetric capacity in a colorless WDM-PON, remodulation becomes the core attraction. Also as the performance of colorless WDM-PON systems suffers from the transmission impairments due to RBS, it is mitigated by using this remodulation scheme. Simulation results show that downstream and upstream signals achieve the error-free performance at 10 Gbit/s with negligible penalty, and enhance the tolerance to RBS-induced noise over a 25 km single-mode fiber.     

10 Gbit/s optical BPSK homodyne detection experiment with solitaryDFB laser diodes

Solitary DFB laser diodes with 174 kHz beat linewidth are applied to a 10 Gbit/s optical BPSK homodyne detection system for the first time: a sensitivity of -38.9 dBm was achieved. A three-electrode laser forms the local oscillator and is modulated with a partial push-pull scheme to improve its frequency response     

10 Gbit/s GaAs 跨阻前置放大器

GaAs基pHEMT工艺适合于制作10Gbit／s速率的高速前置放大器电路。完成了工作于10Gbit／s速率的跨阻前置放大器电路的器件设计、电路设计,电路采用了串联电感L技术,有效地提高了工作带宽。模拟工作带宽达到9．0GHz,跨阻增益达到58dBt2。电路采用0．2pmGaAs基pHEMT电子束直写T型栅工艺制作。对制作的电路进行了电测试,可工作于10Gbit／s的速率。     

10Gbit/s EPON对称OLT光模块的设计

介绍了10Gbit/s EPON(以太网无源光网络)系统中对称OLT(光线路终端)光模块的设计方案和关键技术,重点描述在接收端如何实现双速率突发接收,以及10Gbit/s突发接收部分硬件电路的构成。测试结果表明:该模块在突发接收条件下接收端的接收建立时间和灵敏度均满足10Gbit/s EPON标准IEEE Std.802.3av的要求。     

A silicon-bipolar amplifier for 10 Gbit/s with 45 dB gain

A 10 Gbit/s limiting main amplifier for use in optical transmission systems was implemented in an advanced 0.4 μm silicon-bipolar technology. The device has one differential input and two differential outputs. It is mounted and bonded on a softboard carrier for all of the following measurements. The small signal differential gain is 45 dB and the bandwidth is 9 GHz. The output voltage is limited to 400 mV_pp differential at each output. The minimum input voltage for 1.10^-9 bit error ratio at a pseudo random word of length 2²³-1 was measured to be 2.25 mV _pp. The chip area is 1.8 mm×3.1 mm. The power dissipation is 400 mW at a single supply voltage of -4 V     

10 Gbit/s data switched semiconductor laser amplifier nonlinearloop mirror

Error-free optical modulation of a regular stream of data pulses at 10 GHz by optical data at 10 Gbit/s is demonstrated using a semiconductor laser amplifier within a loop minor. This is achieved without patterning despite an amplifier recovery time of several bit periods by positioning the amplifier near to the centre of the loop. This approach removes sensitivity to the optical polarisation of incoming data     

10 Gbit/s based NRZ DWDM systems using polarisation switching in single wavelength channel

It is experimentally demonstrated that the nonlinear tolerance of 10 Gbit/s/ch NRZ based DWDM systems over 1500 km standard singlemode fibre can be significantly improved through the use of orthogonal polarisation switching between adjacent bits in a single wavelength channel.     

一种用于背板互连的10 Gbit/s接口电路

基于SMIC 40 nm CMOS工艺,提出了一种用于背板互连的10 Gbit/s I/O接口电路。该接口电路由前馈均衡器(FFE)、接收机前端放大器和判决反馈均衡器(DFE)组成。FFE对发射端信号进行预加重,DFE消除较大的残余码间干扰。重点分析了FFE和DFE在消除码间干扰时存在的问题。使用改进的FFE减少对发射端信号的衰减,保证信号到达接收端时具有较大幅度,实现接收机对信号的正确判决,降低系统的误码率。测试结果表明,系统数据率为10 Gbit/s,传输信道在Nyquist频率(即5 GHz)处的衰减为22.4 dB。在1.1 V电源电压下,判决器Slicer输入端信号眼图的眼高为198 mV,眼宽为83 ps。FFE的功耗为31 mW,接收机前端放大器的功耗为1.8 mW,DFE的功耗为5.4 mW。     

基于MZM的再调制单纤双向高速WDM-PON

研究了采用MZM实现再调制的高速WDM-PON方案,通过在Optisystem8.0仿真软件中搭建网络,对基于RSOA和MZM的两种单纤双向再调制WDM-PON进行了比较研究,仿真分析1.25Gb/s、2.5Gb/s和10Gb/s双向对称速率的上行传输性能,证明了基于RSOA的WDM-PON可实现低速远距离传输,而MZM再调制方式则更适合于高速短距离传输应用.     

A 10 Gbit/s OCDMA system based on electric encoding and optical transmission

An electric encoded/optical transmission system of code division multiple access （CDMA） is proposed. It encodes the user signal in electric domain, and transfers the different code slice signals via the different wavelengths of light. This electric domain encoder/decoder is compared with current traditional encoder/decoder. Four-user modula- tion/demodulation optical CDMA （OCDMA） system with rate of 2.5 Gbit/s is simulated, which is based on the optical orthogonal code （OCC） designed in our laboratory. The results show that the structure of electric encoding/optical transmission can encode/decode signal correctly, and can achieve the chip rate equal to the user data rate. It can over- come the rate limitation of electronic bottleneck, and bring some potential applications in the electro-optical OCDMA system.     

10 Gbit/s all-optical clock recovery using three-section DFB laser with optical feedback

All-optical clock recovery using a three-section self-pulsating DFB laser with optical feedback is demonstrated. The feedback of a wavelength-converted clock signal reduces the dependence on the input data signal power, decreases the jitter by up to 2.7 ps, and increases the extinction ratio by 6.5 dB.