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Cascaded amplifiers would enhance the network functionality in the transmission of multi-wavelength signals for longer reach. In this paper, the proposed system is amplified with cascaded SOAs which individually operate in the S band and C band to support the transmission of eight CWDM channels ranging from 1471 nm to 1611 nm. The proposed amplified system produced maximum gain peak of 26 dB for the...
A real-time, centralized and cost efficient monitoring and fault localization system is presented. In this system, a superluminescent diode (SLED) is used as the monitoring signal and the signal is reflected by using different types of fiber Bragg gratings (FBGs); uniform and phase-shifted FBGs as branch identifiers. We demonstrate the enhancement of monitoring wavelength whereas for a distinct center...
This paper presents a monitoring system for tree-structured passive optical access networks. The emitted light of a superluminescent LED is utilized as the monitoring source. The light signal that propagates along the fiber to the customer site is then reflected by a uniform or phase-shifted fiber Bragg grating (FBG), which is employed near the end of the customer site. The wavelength optimization...
In this article, our aim is to investigate passive optical networking (PON) based fiber access systems. An overview of optical OCDMA and optical coding through their features such as increasing the capacity, security and improving the system performance were presented. Modified prime code, which represents a user address and signs each transmitted data bit has been chosen as a signature sequence code...
Semiconductor Optical Amplifier (SOA) is used for a 2.5Gbps Coarse Wavelength Division Multiplexing (CWDM) transmission in O to L-band (1271–1611 nm). Analysis of the proposed topology is conducted using Optisystem software. In this paper, discussions on the gain spectrum and the quality of signal of an optically amplified 18 channel system are provided. A wideband travelling wave SOA which operates...
In this article, a network structure of passive optical network (PON) in conjunction with optical code division multiple access (OCDMA) technique is theoretically investigated using Modified Quadratic Congruence (MQC) codes as a signature sequence, and taking into account the effects of various noises such as shot noise, phase-induced intensity noise (PIIN), thermal noises and multiple access interference...
In this paper, tradeoffs between security and performance in optical CDMA is presented. Confidentiality against eavesdropper interception strategies for optical CDMA is considered. Coherent detection and combining signals shows better confidentiality than the incoherent one. Spectral amplitude optical CDMA based on Modified Double Weight (MDW) systems, with different code dimension, is investigated...
In this paper, 1.25 Gb/s GPON downstream link is presented. All the optical distribution network (ODN) classes are implemented, using Optisystem, to investigate the transmission capability and performance of the proposed downstream physical media (PM) GPON model. Some of the design constraints involved in an optical network design such as fiber span analysis, power budget and margin calculations are...
This paper presents the eavesdropper performance to tap and detect encoded spectral chips from optical CDMA networks. The probability of correctly detecting encoded spectral chip pulses is investigated based on Modified Double Weight (MDW) Spectral Amplitude Optical CDMA. For probability of correct detection of 0.5, an eavesdropper receiver would need to detect SNR of 8 dB. The eavesdropper performance...
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