Jesse E. Simsarian

Fast-tuning 224-Gb/s intradyne receiver for optical packet networks

We demonstrate a digital coherent 224-Gb/s (56-Gbaud PDM-QPSK) packet receiver that selects packets using a fast wavelength-switching local oscillator. A novel three-stage CMA enables blind packet recovery in less than 200 ns.

Demonstration of an Integrated Buffer for an All-Optical Packet Router

An integrated silica 10-channel, AWG-based delay-line optical buffer with up to 100 ns delay is demonstrated. Error-free operation at 40 Gb/s is shown for all channels with penalties of ∼2–4 dB at BER = 10⁻⁹.

Architectures, Components, and Subsystems for Future Optical Packet Switches

Rapidly increasing network traffic is posing a challenge to the construction of future routers. While high-capacity transport has kept pace with rising traffic demands through the use of dense wavelength-division multiplexing, the scaling of core routers is slowed by power density limits and complexity and interconnectivity issues. Optical switching has the potential to overcome these scaling restrictions, and as a result, has generated great scientific and commercial interest. In this paper, we present an overview of some optical packet-switching architectures and describe components and subsystems that are required to enable this technology.

IPTV Bandwidth Demands in Metropolitan Area Networks

In this paper, we analyze the bandwidth requirements in Metropolitan Area Networks (MANs) for providing Internet Protocol Television (IPTV) services. We find that the application with the potential to generate high bandwidth in the MAN is Video on Demand (VoD). However, the amount of bandwidth in the MAN depends on the location of the video servers and cached video content. Therefore, we develop a model of the IPTV network to determine the optimum location of the cached video content. From this model, we find the dependence of the MAN traffic on the fraction of users simultaneously requesting VoD streams. The results show that a significant fraction of future MAN traffic, up to 90%, may be due to these on-demand video services.

High data rate coherent optical slot switched networks: a practical and technological perspective

We review several node architectures for optical slot switching ring networks, which can be used in metropolitan or datacenter applications, and compare them for their networking aspects. The dimensioning, quality of service, latency, and protection issues are discussed for the different approaches. The main devices, i.e. fast wavelength-tunable laser, burst-mode coherent receiver (which is required to enable high data rate transmission at 100 Gb/s and above), and a slot blocker for improved wavelength usage efficiency are described, and available technologies for each key building block are reviewed.

Fast-Tuning Coherent Burst-Mode Receiver for Metropolitan Networks

We demonstrate a fast wavelength-tunable burst-mode receiver for coherent 28 GBd dual-polarization quadrature phase shift keying signals using a commercially available DS-DBR laser as the local oscillator (LO). We find that the frequency drift and linewidth of the LO must be precisely controlled to prevent bit-error-ratio (BER) penalties when the signal undergoes transmission distances typical of metropolitan-area networks. We demonstrate reduction of the LO frequency drift and linewidth after wavelength switching by compensation using the phase section of the laser and achieve negligible BER penalty with burst-mode reception for single-mode fiber transmission up to 1280 km. We also measure the sensitivity of the receiver to LO detuning when multiple wavelength-division multiplexed channels are received simultaneously as in a broadcast-and-select network architecture.

Comb-Based 16-QAM Transmitter Spanning the C and L Bands

A multiwavelength source for optical transmitters delivers narrow-linewidth carrriers with 100-GHz spacing spanning the C and L bands. The phase-locked carriers are derived from a single, 3-kHz linewidth source, and a multistage parametric mixer. Bit-error rate measurements for a 20-GBd 16-QAM transmitter based on this source are reported.

Demonstration of an integrated buffer for an all-optical packet router

We demonstrate an integrated optical buffer, fabricated in silica, with data storage up to 100 ns. The buffer consists of an array of waveguide delays between matched arrayed waveguide grating (AWG) routers and is designed for an all-optical packet router where buffering is required to resolve packet contention. By changing the incoming signal wavelength, the output port of the first AWG router is selected, thereby selecting a storage time in the buffer. All buffer channels have been demonstrated at 40 Gb/s with error-free operation and penalties of ~ 2-4 dB for bit-error rate =1times10-9.

Cross-Layer Aware Software Defined Networking in an IP Over Optical Transport Network

We demonstrate possible applications for software-defined networking in a transport network using carrier-grade routers and optical transmission equipment. The cross-layer applications dynamically respond to traffic conditions and optical impairments

Network global expectation model of optimized routing and grooming in multi-layer service transport

We present a new, highly scalable analytical model of the electronic-and-optical routing and grooming process that accurately reproduces and explains recent results for the numerical optimization of transponder count in networks with quasi-static uniform and random traffic.