M. F. L. Abdullah

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A new code structure for spectral-amplitude-coding optical code-division multiple-access system based on double-weight (DW) code families is proposed. The DW code has a fixed weight of two. By using a mapping technique, codes that have a larger number of weights can be developed. Modified double-weight (MDW) code is a DW code family variation that has(More)
This paper presents a new code structure and its ability in supporting multiple transmission rates in point to point spectral amplitude coding-optical code division multiple access (SAC-OCDMA) links. The double-weight (DW) code family that has a basic fixed weight of 2 was proposed. Modified double weight (MDW) code is a DW code family variation that has(More)
A new detection scheme, namely AND subtraction technique is proposed and presented in this paper. The theory is being elaborated and the calculated and simulation results have been done by comparing AND subtraction technique against complementary subtraction technique by using DW code. In this paper we have proved that AND subtraction technique gives better(More)
Stacked-chip scale package (S-CSP) is a technology which has high density packaging options. It enables to stack the die in a single package. The S-CSP widely adopt ed in portable multi-media products. However, resin flow through a thin space and wide filling area has become concern. Therefore, this paper presents a study of flow visualization during(More)
A new multiplexing technique based on duty cycle division is proposed, thus the name duty cycle division multiplexing (DCDM). DCDM can be applied in both electrical and optical domains, for wired and wireless systems. The new technique allows for more efficient use of time slots as well as the spectrum, taking advantage of both the conventional TDM and FDM.(More)
This paper presents the effect of atmospheric attenuation during hazy days for free space optical (FSO) communication in point-to-point connection. The analysis focuses on scattering coefficient and atmospheric attenuation effects on low visibility, which falls in the range of 1.8 km to 4.5 km. The performance comparison is also done for the wavelength of(More)
Large scale projects replacing copper network with optical fiber such as photonic-access-to-the-home (PATH) in Korea signify the age of fiber based network, making protection to fiber based network a crucial need. It is found that FTTH technology and Ethernet passive optical networks (EPONs), which represent the convergence of low-cost fiber infrastructure(More)
A dynamic optical code division multiple access (DOCDMA) communication system is proposed for high-bandwidth communication systems. An implementation of the system is proposed based on a fast tunable optical filter (TOF) in each encoder and decoder. This technique actively modulates the central wavelength of a TOF according to a functional code at the(More)
A new detection scheme, namely AND subtraction technique is proposed and presented in this paper. The theory is being elaborated and experimental results have been done by comparing double-weight (DW) code against the existing code, Hadamard. In this paper we have proved that AND subtraction technique gives better bit error rates (BER) performance than(More)
Optical transmission technologies are known to provide very high speed data rate. This includes the popular multi-channel dense wavelength division multiplexing (DWDM) technology which allows a straight forward transmission bandwidth enhancement by increasing the number of channels.This, however, will no longer be enough in the near future when the user(More)