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250 Gb/s ultrafast all-optical memory using quantum-dot semiconductor optical amplifiers

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Optical packet switching (OPS) is a widespread technology in telecommunication systems because it processes the signal in the all-optical domain in respect of its characteristics of higher operation rate, power efficiency, and transparency. Memory is used in applications of long-term data storage/buffer. To develop OPS networks in order to avoid packet collisions during packet routing, a high-speed memory is necessary.

 

In a study published in IEEE Journal of Selected Topics in Quantum Electronics, Prof. GUO Chunlei and Dr. KOTB Amer from Changchun Institute of Optics, Fine Mechanics, and Physics (CIOMP) of the Chinese Academy of Sciences has theoretically demonstrated a novel ultrafast all-optical memory at 250 Gb/s using quantum-dot semiconductor optical amplifiers (QDSOAs) for 500 loop circulations with a return-to-zero modulated pulse format.

 

In this study, the memory loop includes two parallel Mach-Zehnder interferometers with four symmetrical QDSOAs, acting as all-optical AND logic gate and regenerator in a loop configuration, in order to increase the number of memory circulations up to 500 at 250 Gb/s.

 

The data in the proposed memory loop is regenerated after 0-500 circulations. Therefore, the data transmission will not suffer any serious degradation such as dispersion or nonlinearities. Moreover, the output shape of the output data is preserved due to the use of a clock signal as a probe signal through the AND operation.

 

Since the data is improved during each recirculating and 3 nm width optical bandpass filters (OBPFs) are used to reject it out, the impact of amplified spontaneous emission noise can also be avoided.

 

The memory operation is examined and evaluated by the quality factor (QF), which is a more sensitive method of measuring memory quality. The numerical results showed that the proposed memory can be operated up to 250 Gbs with 8.65 QF for 500 loop circulations due to faster dynamics exhibited by the QDSOAs.

 

 

Schematic of all-optical memory using MZIs with QDSOAs. OC: 3 dB optical coupler. WSC: wavelength selective coupler. OBPF: 3 nm optical bandpass filter(Photo by CIOMP)

 

 

Auther: KOTB Amer

E-mail: amer@ciomp.ac.cn

Article links: https://ieeexplore.ieee.org/abstract/document/8877760

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