The model discussed in this paper is of multiple optical logic gates in a single photonic circuit. NAND, AND, NOR, OR, XOR, XNOR, NOT gates are incorporated in the design. The outputs of these gates are on different wavelengths of conventional band, from 1550 to 1560 nm. The gates are achieved by using 2 × 2 coupler with different coupling coefficient, multiplexer and the nonlinearities of SOA, which are otherwise regarded as demerit if SOA is used as an amplifier. The performance of the suggested model is analyzed through extinction ratio and quality factor, recorded for different values of length and confinement factor of SOA. Results of each individual gate are analyzed. The growth of all optical multiple logic functions onto a single chip is leading towards complex photonic computing and gradually eliminating the need for opto-electric conversions.

Design and performance analysis of multiple all optical logic gates in a single photonic circuit

A Study of various Trends and Enabling Technologies in Radio over Fiber (RoF) Systems

On the basis of Sagnac interferometric structure, a simple novel ultrafast scheme of all-optical half-adder is proposed. The structure comprises two of the same balanced terahertz optical asymmetric demultiplexers (TOADs). One TOAD is utilized to achieve an all-optical XOR gate, which is logic SUM. The other is utilized to obtain an all-optical AND gate, which is logic CARRY. Logical SUM and CARRY are simultaneously realized at 80 Gbit/s. Through numerical analysis, the operating characteristics of the scheme are illustrated at 80 Gbit/s. Furthermore, the carrier recovery time of the semiconductor optical amplifier is no longer a crucial parameter to restrict the operation speed of this scheme.

Simple novel all-optical half-adder

In this paper, we have discussed in detail the four wave mixing (FWM) effect of dense wavelength division multiplexing (DWDM) in Radio-over-Fiber (RoF) system. A 32-channel 40-Gbps system is considered. FWM effect for various channel spacing, input power level, effective fiber area and modulation formats are analyzed. Different schemes for minimizing these effects are discussed for the first time. Considering all these effects, an optimized DWDM setup is designed using single parameter optimization (SPO) technique.

Optimization of Four Wave Mixing Effect in Radio-over-Fiber for a 32-Channel 40-GBPS DWDM System

Novel all-optical implementations for logic AND and XOR gates are experimentally demonstrated at 2.5 Gbit/s based on cavity-enhanced four-wave-mixing (CE-FWM) combined with optical injection locking phenomena in monolithically integrated semiconductor ring lasers (SRLs). An all-optical AND gate with simultaneous wavelength conversion has been achieved using CE-FWM. An XOR function is demonstrated using two parallel SRLs, each performing one part of the XOR Boolean equation A ⊕ B=AB+AB. Error-free operation with extinction ratio higher than 10 dB confirms the suitability of SRLs for all-optical logic applications.

All-optical digital logic AND and XOR gates using four-wave-mixing in monolithically integrated semiconductor ring lasers

Optical injection locking and cavity enhanced four-wave mixing in semiconductor ring lasers have been used to generate data modulated millimeter (mm)-wave optical signals. The scheme is shown to have multigigahertz (multi-GHz) modulation bandwidth. The 4-Gb/s data is transferred directly from an intensity modulated optical signal onto an mm-wave optical signal with the mm-wave frequency tunable in steps of 62.5 GHz and with flexible radio-frequency modulation formats over the optical carrier. Bit-error-rate and eye-diagram measurements confirm excellent signal quality.

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Generation and Modulation of Tunable mm-Wave Optical Signals Using Semiconductor Ring Laser

A novel all-optical multicast scheme based on cavity-enhanced four wave mixing in a monolithically integrated semiconductor ring laser (SRL) is proposed. By employing an injecting optical signal resonant with a cavity mode of the SRL, one-to-seven all-optical multicast by means of highly efficient simultaneous multi-wavelength conversion has been experimentally demonstrated up to multi-gigabit data rates. The scheme offers several advantages including low power penalty, reconfigurability, monolithic integration and low cost.

Configurable all-optical multicast using cavity-enhanced four wave mixing in semiconductor ring laser

Reconfigurable all-optical multicast at multi-gigabit data rates has been realised using simultaneous multi-wavelength conversion based on cavity-enhanced four-wave-mixing in a monolithically integrated semiconductor ring laser. The scheme provides high efficiency, low power penalty, and cost-effectiveness.

All-optical multicast based on cavity-enhanced four-wave-mixing in semiconductor ring laser

All-optical digital logic AND and XOR gates based-on cavity-enhanced four-wave-mixing in an integrated semiconductor ring laser are demonstrated at 2.5Gb/s. Error free operation with ER >10dB is achieved.

Dan Lu

Papers

Generation and Modulation of Tunable mm-Wave Optical Signals Using Semiconductor Ring Laser

All-optical digital logic AND and XOR gates using four-wave-mixing in monolithically integrated semiconductor ring lasers

Configurable all-optical multicast using cavity-enhanced four wave mixing in semiconductor ring laser

All-optical multicast based on cavity-enhanced four-wave-mixing in semiconductor ring laser

Cavity-enhanced four-wave-mixing in an integrated semiconductor ring laser for all-optical digital logic operations