This paper presents a comparative study of the number of pieces of optical transport equipment, network cost and power consumption depending on the transmission reach of the 400-Gb/s-based signal between flexible-bitrate networks using 100-Gb/s and 400-Gb/s signals and 100-Gb/s-based single-line-rate networks. In this study, we use three types of network topologies: a North American network topology, a European network topology and a Japan photonic network topology. As for the transmission reach of the 400-Gb/s-based signal, considering performance margins, different transmission reaches of the 400-Gb/s signal are assumed varying from 300km to 600km with 100-km increments. We show that the 100-Gb/s and 400-Gb/s-based flexible-bitrate networks are effective for cutting the total number of pieces of equipment and could be effective for reducing network cost and power consumption depending on the transmission reach of the 400-Gb/s signal in the case of a relatively small-scale network.

Recently, the GMPLS controlled WSON has emerged as a promising optical transport network. In order to guarantee the optical signal transmission feature without deformation, the optoelectronic 3R regenerators still need to be sparsely placed in the network, termed as translucent networks. The growing size and complexity of the translucent network requires a transition of control plane to move from the traditional centralized model to a fully distributed architecture in the future. However, centrally designed routing, wavelength assignment, and 3R regenerator allocation approaches become unfeasible under the distributed paradigm due to the outdated and inconsistent network state information. A common solution is to accelerate the update frequency of network state, but the fundamental problem remains that the inaccurate state information is still inevitable. Furthermore, it adds a significant increase to the control traffic volume which adversely degrades the performance and scalability of the network control system. In order to mitigate the impact of having inaccurate state information on network performance in the distributed systems, a novel RWA approach is proposed in this paper, termed as routing and distributed wavelength assignment with top ranked probing wavelength set computation. In our proposal, the wavelength assignment is performed by signalling process with a set of carefully preselected probing wavelengths. This set is dynamically computed based on the resource utilization each time the network state is refreshed. The PCE module is adopted in WSON control plane to be responsible for the computation of RWA and 3R allocation. The performance of the proposed approach is studied by extensive simulations. The experiment results reveal that by employing the proposed scheme, without loss on the blocking performance the inaccuracy of the wavelength availability information can be well tolerated, and the set-up delay in lightpath provisioning can be kept at a low level.

This report describes a concrete method for realizing adiabatic charging reversible logic. First, we investigate the stabilization properties of a charge recycle regenerator using a switched capacitor circuit by SPICE simulation and an analytical method. In the N-step case, we proved that a step waveform is spontaneously generated. Next, for combinational logic, we propose an adiabatic charging binary decision diagram logic gate (AC-BDD) that uses this regenerator. The AC-BDD uses pass transistor logic based on a BDD, which is suitable for adiabatic logic. 8-bit AC-BDD multipliers were fabricated, and it is clarified that power consumption is reduced to 15% that of the same-rule-designed CMOS at 1 V and 1 MHz. Finally, we propose clocked energy reversible logic (CERL) that maintains the CMOS architecture for CMOS compatibility. CERL can reduce the clocked energy, which is used for charging the clock load capacitance, to 10% that of CMOS by using a power clock from the charge recycle regenerator.

We have proposed and demonstrated a novel optical regenerator architecture employing electroabsorption modulators as wavelength converters. The employment of EA modulators is advantageous for high-speed operation and flexibility in the bit-rate for the pulse regeneration. In addition, the EA modulator-wavelength-converter acts also as a photo diode for clock extraction. Compensation of the optical SNR and Q-factor has been demonstrated, even in cascaded noise load. Furthermore, against dispersion loading, we have confirmed that waveform recovery and Q-factor improvement is obtained by midway insertion of the optical regenerator. The proposed architecture will offer a wide-band-electronics-free optical regenerator in multi-tens of gigabit per second WDM networks.

We have proposed and demonstrated a novel optical regenerator architecture employing electroabsorption modulators as wavelength converters. The employment of EA modulators is advantageous for high-speed operation and flexibility in the bit-rate for the pulse regeneration. In addition, the EA modulator-wavelength-converter acts also as a photo diode for clock extraction. Compensation of the optical SNR and Q-factor has been demonstrated, even in cascaded noise load. Furthermore, against dispersion loading, we have confirmed that waveform recovery and Q-factor improvement is obtained by midway insertion of the optical regenerator. The proposed architecture will offer a wide-band-electronics-free optical regenerator in multi-tens of gigabit per second WDM networks.