Multigigabits per second millimeterwaves (MMW) have found wide application in a variety of areas. There is always a demand for not only discovering costly effective ways of generating MMW, but also carrying high bit rate signals, up to 2.5 Gb/s, as long as possible. In this paper, a development for dispersion compensation technique for the transmission system of optically generated MMW signals is presented. Optical MMW that modulated with 2.5 Gb/s, could not travel safely through a fiber span for more than 70 Km. Applying analytical design for dispersion compensation to the same MMW signal that generated with the same way, it is possible to transmit it with very low bit error rate (BER) through a fiber length more than 118.8 Km. The proposed technique for dispersion compensation is based on modifying the parameters of the fiber link and the transmitted signal as well. A comparison between the results with and without the abovementioned technique is also presented in this paper. Dispersion map, compensation, Millimeter Waves, Dispersionmanaged, Soliton. I. INTRODUCTION ECAUSE of growing the demand of transceiving too much data at the same time, systems applying millimeterwaves have found wide application in the fields of communications, radar, radiometry, spectroscopy, and radio astronomy, etc. Electronics based generation of millimeterwaves using oscillator and frequency multiplexers has been achieved; however, such millimeter wave sources are usually huge, heavy and usually unstable. In addition, due to the serious air propagation loss, the free space transmission distance of extremely high frequency signals is generally limited. These issues of generation and propagation loss encouraged researchers to optically generate and transmit those signals through fiber spans to the last mile before they are converted to wireless signals and then propagated to the end users. Fixed wireless access (FWA) links are very attractive for the lastonemile networks and wide networks because they are saving time and cost of installation in addition to being more flexible and physically uncomplicated. Recently, the speed of FWA is still in the range of 1 Gb/s, that is why FWA links still need more effort of research for more improvement [1]. Also, distributing optically generated MMW signals via fibers has some problems such as dispersion caused by fiber links. In this paper, a simple and inexpensive generation technique of MMW is presented. The generated signal will be transmitted through long fiber span because of the applied analytical technique of dispersion compensation to the system [2]. II. GENERATION OF MMW SIGNALS Generation and transmission of MMW signals based on photonic techniques are capable of effectively declining the mentioned above limitations of electronic devices. Also, the generation of millimeter waves based on photonics, provides lowphase noise, require simple equipment, and wide bandwidth of such generated signals [3]. Several techniques for MMW generation have been approached. MMW generation based on external modulation technique is the proposed technique to be improved by applying the analytical design to give high quality results when these signals are transmitted through a long haul fiber span. This method of modulation is to operate laser source in continuous wave (CW) mode and by using an external modulator such as the MachZehnder Modulator (MZM), to externally modulate the output current of the light source with RF signal as shown in Fig.(1). [4]. A Signal with 60GHz as illustrated in Fig.(2) was generated when a 30GHz RF signal was applied to the Analytical Dispersion Compensation Technique To Transmit Optical MillimeterWaves Over Long Fiber Links Abdosllam M. Abobaker, Daw A. Asderah, Elghanai M. Rhoma B O/E Laser M M 10 Gb/s DC 30 GHz 90 o Figure 1. MMW generation system based on dual drive MZ Modulator. M: modulator, O/E: optical to electrical converter. Figure 2. The generated MMW signal. Advances in Communications, Computers, Systems, Circuits and Devices ISBN: 978-960-474-250-9 75