Abstract
Utilization of an adaptable transceiver with quality of service (QoS) features is a promising notion to build next generation optical network. This paper proposes an adaptive transceiver design by adopting logic gates in the optical domain. The proposed design offers multiple scenarios to support QoS diversity with a slight modification of conventional optical code division multiple access (OCDMA) transceiver architecture through Sigma Shift Matrix (SSM) signature code. In particular, the proposed transceiver design categorizes the users into two classes of service, one having a higher quality level and the other having a lower quality level. Users of high class transmit at low interference versus high interference power for low classes’ users. To switch between the multiple scenarios, an optical Mux performs digital operation is developed and integrated to the transceiver design. This type of MUX is built by using a semiconductor optical amplifier (SOA). In addition, a comprehensive algorithm is developed to control the function of the adaptable transceiver. Five scenarios were formed and investigated to offer a platform for a different type of applications. A proof concept using Optisystem software demonstrates ability of the proposed architecture to efficiently switch between different levels of QoS as per user requirement and provide desired transmission capacity
Highlights
The optical code division multiple access (OCDMA) technique has gained much attention in the field of optical networking and many OCDMA schemes have been proposed and developed to support service differentiation
OCDMA is utilized in multiple optical access communication and computer network applications such as passive optical networks (PONs) [5], metropolitan area networks (MANs) [6], optical fiber sensors [7] and radio-offiber (RoF) [8]
An acceptable bit error rate (BER) of 10−9 was achieved by the SSMch code with higher number of supported users (30 active users) when compared to MFH and DPS codes (18 active users and 15 active users)
Summary
The optical code division multiple access (OCDMA) technique has gained much attention in the field of optical networking and many OCDMA schemes have been proposed and developed to support service differentiation. OCDMA provides dynamic bandwidth assignment capabilities along with asynchronous access It is most preferred solution for bursty traffic, with multiple bit-rate services features and differentiated QoS, while maintaining confidentiality of information [14, 15]. Durand et al presented energy efficient adaptive random access protocol based on particle swarm optimization (PSO) method for optical CDMA networks [21] This protocol design is S-ALOHA based on power and rate allocation based on PSO. Diversity in OCDMA technique can be utilized to provide different levels of QoS differentiated by bit error rate (BER) performance without varying the code parameters [27]. Numerical results validated that aggregate throughput is maximized for predetermined QoS restrictions and with energy efficiency constraint in terms of the signal-to-noise plus interference ratio of each user class
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