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[vc_message icon_fontawesome=”fa fa-pencil”]Teacher: Nur Abdillah Siddiq
Summary: this article compares the technique of multiplexing OTDM vs. FWDM/OWDM. Explain the similarities and differences, advantages and disadvantages. [/vc_message]
"Today, optics is a niche technology. Tomorrow, it's the mainstream of every chip that we build. " Pat Gelsinger, Intel senior vice president.
Growing number of internet users and the greater needs of super fast internet cause optical communication field continues to evolve. One of the key in the process of sending data in optical multiplexing techniques. Multiplexing is a technique of sending more than one (a lot of) information through one channel, in the context of optical communication channel is fiber optic. The main purpose of the multiplexing is to conserve the number of fiber optic channels. Imagine if 1 the home internet subscription via optical fiber to wear 1 fiber-optic channels to the internet service provider (ISP, Internet Service Provider), then how great the buntelan that occur in the cable ISP to serve the needs of the internet community in the city of 1. With the multiplexing techniques, then there is enough cable only 1 that are in the ISP and are able to serve the needs of the internet community. Fiber optic cable from each home will be collected into a telephone pole, 1 on 1 pole normally can cover up to 1 village.
Optical multiplexing techniques are divided into two categories, namely time-based (OTDM Optical Time Domain = Multiplex) and frequency/wavelength (on = Optical Frequency Division Multiplex or OWDM Optical = Wavelenght Division Multiplex). Frequency (f) and the wavelength (λ) are inter-related to each other through the equation c = λ. f, c is the speed of light. Therefore the frequency and wavelength Multiplexing technique refers to the same. Before explaining the difference, equations, excellence, and the disadvantages of both techniques the multiplexing scheme of both can be seen in the following image,
Scheme of Multiplexing technique of OTDM 
On the technique of OTDM channel multiplexing different data happens in the domain of time. The data channel is put in a State of loopholes (slot) of the not overlapped (non-overlapping). But all the slot overlap in the frequency domain, is caused by wear only 1 wavelength only.
The scheme of the multiplexing techniques OWDM/on 
On the technique of multiplexing OWDM/on, different data channels occur in the domain of the wavelength/frequency. The data channels are placed on different frequency bands so don't get there the same frequency for different data channels.
For the advantages, disadvantages, differences, and the similarities of the multiplexing techniques and on/OTDM OWDM are summarized in the following table,
|Optical Time Division Multiplex||Optical Wavelength Division Multiplex|
|Key Processes||A very short pulse transmission (Ultra short pulse transmission)||The number of wavelengths to different carrier pulses in optical fiber 1 (large number of carrier wavelengths in the same fiber)|
|Advantage||The system is easy to made and applied||The components in the system are easily obtained|
|Losses||There are challenges in the process of switching||Quite a number of required components, takes up more space|
|Complexity in the process to retrieve data demultiplexing in order 1 femto seconds||Need a laser with high frequency stability|
|The large dispersion||Wavelength/frequency conversion is quite difficult|
|The most important optical components||-Laser mode-locked
-Optical DEMUX all of which influence or without electricity (All optical DEMUX)
-Dispersion Compensator (Dispersion compensator)
-Filter with narrow bands (Narrowband filters)
-Laser with a single and stable frequency (Single frequency sources)
|Equation||Need optical modulator and demodulator|
|Need fotodetektor the recipient|
|Need optical amplifier to boost the signal strength|
|Clock extraction process requires on a receiver that is used to extract information on receiver|
|Need filter wavelength to obtain the desired wavelength|
 Mosso, m. m., et al. "Quasi OTDM-all-optical demultiplexing techniques for comparative analysis." Microwave and Optoelectronics Conference, 1997. Linking to the Next Century. Proceedings., 1997 SBMO/IEEE MTT-S International. Vol. 2. IEEE, 1997.
 http://www.rfwireless-world.com/Terminology/OTDM-vs-OWDM.html accessed on 4 November 2017
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