WDM optical interconnect enabled by optical frequency comb based on dual-drive modulator

\u3cp\u3eWe report an optical frequency comb (OFC) generation by using a single dual-drive Mach-Zehnder modulator (DD-MZM). Over 21 comb modes with optical power above -5dBm and power flatness of 0.81 were generated within the -6 dB bandwidth of the OFC optical spectrum. 10 Gb/s OOK data modulation were applied to the optical combs, and error free transmission were achieved after 10-km SSMF. The results indicated that a total capacity of 210-Gb/s WDM optical interconnection link can be enabled by the OFC based on a single DD-MZM with potentially 44% reduction of power consumption compared the case of using multiple laser diodes.\u3c/p\u3

Scalable and low latency label processor for large port optical packet switch

We propose a novel labeling technique based on N in-band wavelengths, each carrying M radio frequency (RF) multi-tones. The wavelength and the tone have a binary value. Thus, with N wavelength carrying M tones, up to 2N*M possible labels can be generated. We also develop an optical label processor (OLP) technique that allows parallel and on-the-fly operation of the 2N*M labels by using N photo-detectors and digital signal processor (DSP). We investigate the maximum number of RF tones that can be carried by one in-band wavelength. Analysis results show that, given packets of 100 ns duration (10 MSymbol/s) and an in-band wavelength with a narrow optical bandwidth of 1.5 GHz, up to 15 tones spaced by 100 MHz can be successfully delivered by only one wavelength and processed by the OLP with little guard time and latency introduced. We experimentally validate the generation and processing of 256 labels by using one wavelength (N=1) carrying 8 RF tones (M=8)

Data format agnostic optical label processing techniques for intelligent forwarding of packets in all-optical packet switched networks

\u3cp\u3eThe exponential growth of the Internet data traffic will demand high capacity optical networks. High capacity optical links will carry optical packets at data rates above 100 Gb/s using a variety of data-formats such as OTDM data packets, multi-wavelength optical packets that might have highly spectral efficient modulation formats, such as D(Q)PSK, OFDM, M-QAM. On the other hand, routing of packets by today electronic circuit switching may have fundamental limits due to the speed and the scalability of multi-rack electronic switching fabrics, and the associated power consumption by opto-electronic conversions. Switching of the optical packets transparently in the optical domain eliminates power hungry opto-electronic conversions. One of the main sub-systems needed for switching transparently the optical packets is the implementation of a label processor that determines the packet destination and controls the switching fabric. In this talk, we discuss different asynchronous and low latency label processing techniques that can extract information on the packet forwarding of optical packets with multiple data formats and data bit-rates, to allow the implementation of intelligent systems for optimal routing of the packets in the optical domain.\u3c/p\u3

Low latency and efficient optical flow control for intra data center networks

We demonstrate a highly spectral efficient optical bidirectional system based on reusing the label wavelength to implement an optical flow control for intra-data center networks. Experimental results show error free operation and an effective reduction of the system complexity

Novel flat datacenter network architecture based on scalable and flow-controlled optical switch system

We propose and demonstrate an optical flat datacenter network based on scalable optical switch system with optical flow control. 4×4 dynamic switch operation at 40 Gb/s reported 300ns minimum end-to-end latency (including 25m transmission link) an

Experimental assessment of a scalable and flow-controlled optical switch system for flat datacenter networks

We propose and demonstrate an optical flat data center network based on scalable optical switch system with optical flow control. Experimental evaluation of the system at data rate of 40 Gb/s includes a 4×4 optical switch with highly distributed control for port-count independent nanosecond reconfiguration time for low latency operation. The hardware flow control at the optical level allows fast retransmission control of the electrical buffered packets at the edge nodes preventing the need of optical buffers. Moreover, this makes a dedicated flow control network redundant, which effectively reduces system complexity and power consumption. Dynamic switch operation reported 300 ns minimum end-to-end latency (including 25 m transmission link) an

Novel flat datacenter network architecture based on scalable and flow-controlled optical switch system

We propose and demonstrate an optical flat datacenter network based on scalable optical switch system with optical flow control. Modular structure with distributed control results in port-count independent optical switch reconfiguration time. RF tone in-band labeling technique allowing parallel processing of the label bits ensures the low latency operation regardless of the switch port-count. Hardware flow control is conducted at optical level by re-using the label wavelength without occupying extra bandwidth, space, and network resources which further improves the performance of latency within a simple structure. Dynamic switching including multicasting operation is validated for a 4x4 system. Error free operation of 40 Gb/s data packets has been achieved with only 1 dB penalty. The system could handle an input load up to 0.5 providing a packet loss lower that 10-5 and an average latency less that 500ns when a buffer size of 16 packets is employed. Investigation on scalability also indicates that the proposed system could potentially scale up to large port count with limited power penalty

Optical packet switch node with packet flow control for flat inter-cluster data center network

\u3cp\u3eWe experimentally investigate a flow-controlled optical packet switch node operation. The distributed control and the nanosecond packet switching/retransmission allow a limited input buffer capacity to ensure packet loss <10\u3csup\u3e-5\u3c/sup\u3e for loads up to 0.5.\u3c/p\u3

320 Gb/s all-optical clock recovery and time de-multiplexing after transmission enabled by single quantum dash mode-locked laser

We report, to the best of our knowledge, the first demonstration of 320 Gb/s all-optical clock recovery and all-optical time de-multiplexing after 51 km transmission by exploiting single-quantum dash mode-locked laser diode (QD-MLLD). Based on injection locking of the QD-MLLD, the 40 GHz synchronized optical clock pulses were recovered from the 320 Gb/s with a pulse width of 1.9 ps and timing jitter of 135 fs, which allowed directly time de-multiplexing of 320–40 Gb/s without additional complex optoelectronic circuitry. The 320–40 Gb/s all-optical de-multiplexing was achieved with averaging a power penalty of 4.5 dB at BER of 1E-6

Low-latency photonic packet switches with a large number of ports

Optical packet switches that introduce little latency, scale to large port-count and handles high-bit rate data might find their use in future computing systems. We discus technology that lead to such optical switching system