Xiaobing Hong

A study of adaptive burst assembly mechanism in optical burst switch networks

As a promising switching paradigm, Optical Burst Switch (OBS) was proposed for optical networks showing more efficient and shorter delay than traditional circuit switching, and it is more feasible than optical packet switching. In OBS, burst assembly is one of the critical technologies, and will significantly affect the performance of networks. In this paper, we focus on the study of burst assembly mechanism, and propose a new burst assembly algorithm, which reduces the self-similarity of IP traffic, enhances the data burst utilization and avoids the bandwidth contention due to sending burst data synchronously at different ingress nodes.

Passive harmonically mode-locked fiber ring laser with long single-mode fiber and its application for high-resolution measurement of fiber length

Passive harmonically mode-locked fiber ring laser with long single-mode fiber SMF has been demonstrated. With the increase of nonlinearity due to the incorporation of a long SMF, it is found that the laser can operate in harmonic mode-locking states with various repeti- tion rates. Furthermore, based on the passively mode-locked fiber ring laser, a novel and simple technique for fiber length measurement with resolution on the order of centimeters has been proposed. The fiber length can be easily obtained from the fundamental cavity frequency of the mode-locked fiber laser because the transit time in a laser cavity is exactly proportional to the cavity length.

Impact of OBS and TCP parameters on instantaneous behavior of TCP congestion window on LOBS network testbed

Impact of OBS and TCP parameters on instantaneous behavior (fluctuations) of TCP cwnd is evaluated on LOBS Testbed. Experimental and simulation results show that cwnd fluctuations can be reduced by tuning OBS and TCP parameters.

Arbitrary repetition-rate multiplication of high speed optical pulses using a programmable optical processor

We demonstrate a method to realize arbitrary repetition-rate multiplication of 40 GHz optical pulses based on optical spectrum manipulation. The generated 80–320 GHz pulses can well maintain the original pulse shape with uniform amplitude and improved SNR.

Simultaneous realization of a multifunctional photonic logic gate based on bidirectional FWM

We demonstrate a photonic logic gate for RZ-PolSK signals based on bidirectional FWM in HNLF. Multi-function, such as XOR, ̅AB, ̅AB, XNOR, AND, NOR, half-subtracter, half-adder, comparator and decoder, are simultaneously implemented.

Unstable nonlinear spectral filtering balance in ANDi passive modelocking fiber lasers

Wave breaking of similariton in all-normal-dispersion (ANDi) fiber lasers is studied theoretically and experimentally. The nonlinear intra-cavity spectral filtering balance becomes unstable with greatly-decreased ASE noise tolerance under excessive nonlinearity, and then wave breaking occurs.

Radio-over-fiber techniques and demonstration for in-building optical-wireless access networks

This paper presents our recent progress on advanced radio-over-fiber (ROF) technologies for in-building optical-wireless access networks, including multi-service, full duplex and polarization diversity ROF systems design, and experimental delivery of uncompressed HDTV signals. The novel polarization diversity technique is proposed to improve receiving sensitivity and increase anti-interference capacity of the wireless transmission at the in-building environment.

Experimental demonstration of dynamic end-to-end lightpath provisioning mechanism in OBS/GMPLS interworking network

Multi-layer Provisioning (MLP) of End-to-End light-path in OBS/GMPLS interworking network is successfully demonstrated by introducing extensions to MPLS signaling protocol in LOBS network. The feasibility of this mechanism was experimentally verified in an OBS/GMPLS testbed. In contrast to pervious single-layer resource provision mechanism, MLP ensures stable and high throughput of Reno TCP transportation.

Polarization-dependent output states of a fiber laser with nonlinear polarization rotation

A fiber laser with two different polarization-dependent output states is demonstrated. On the one hand, intensity-dependent loss in a nonlinear optical loop mirror, induced by nonlinear polarization rotation, can balance mode competition of a homogeneous broadening gain medium, and thus allows for stable room-temperature multiwavelength generation. On the other hand, intensity-dependent transmission can act as an equivalent saturable absorber, which results in passive mode locking of the fiber laser. It may thus serve two functions: passive mode locking and multiwavelength emission.

A novel integratable optical analog-to-digital converter based on cascaded step-size MMI

A novel phase-shifted optical analog-to-digital converter using cascaded step-size MMI as quantization module is demonstrated. The cascaded MMI on SOI has a compact footprint of 7.5×100 μm2 and ultra-low insertion loss of 0.2dB.