We proposed a novel 2x2 all optical packet switching router architecture supporting asynchronous variable-length packet. In order to deal with the contention problem we adopt for wavelength conversion strategy. A proof of concept through Optiwave simulation is validated. We have showing that the contending packet is detected and forwarded according FIFO (First In First Out) strategy at a different wavelength. Error-free functionality is achieved for high bit rates (up to 100 Gbps).
In this paper two all optical packet forwarding architectures based on non linear effect in semiconductor optical amplifier in Mach-Zehnder configuration SOA-MZI are studied. The first architecture consist in combing flip flop functionality with the AND logic functionality in the same unit. Error free operation at 40 Gbps for two cascaded nodes is achieved. In the second architecture two separated units namely the flip flop and the AND logic gate are used. 100 Gbps bit rate is reached. At 40 Gbps error free operation is achieved for three cascaded nodes.
We proposed a novel 2×2 all optical packet switching router architecture supporting asynchronous, labelled and variablelength packet. A proof of concept through Matlab Simulink simulation is validated. Then we discussed the three possible scenarios to demonstrate the contention resolution technique based on deflection routing. We have showing that the contending packet is detected and forwarded according FIFO (First In First Out) strategy to another output.
This paper presents the Direct Sequence Optical Code Division Multiple Access (DS-OCDMA) system using two
configurations of the optical source. To encode/decode transmitted data, we used Superstructured Fiber Bragg Grating
(S-FBG) as encoders/decoders. We consider three unipolar family codes which are the Prime Sequence (PS), Quadratic
Congruence (QC) and the Extended Quadratic Codes (EQC) codes. In order to evaluate the performances of our system
in term of Bit Error Rate (BER), we implement the Importance Sampling (IS) technique, which is a variant of the wellknown
Monte-Carlo (MC) method. Our simulation results depict that EQC codes outperform QC and PS codes for the
DS-OCDMA system using either coherent or incoherent source. We show also that using EQC codes with increasing the
optical bandwidth and maintaining the electrical filter leads to improve the performance of incoherent system.
In this paper, we compare the performances of a coherent versus incoherent Direct Sequence Optical Code Division
Multiple Access (DS-OCDMA) system. Superstructured Fiber Bragg Grating (S-FBG) encoders/decoders are used to
implement unipolar codes such as Prime Sequence (PS) and Extended Quadratic Codes (EQC) codes. We implement the
Importance Sampling (IS) technique, which is a variant of the well-known Monte-Carlo (MC) method, to evaluate the
Bit Error Rate (BER) performances of the system. Our simulation results depict that coherent system outperforms the
incoherent one. The last system can be used but a BER floor is demonstrated due to the beat noise of the incoherent
source. We show that increasing bit rate leads to a deterioration of the BER behavior and requiring an increase of the
optical bandwidth of the signal.