mm wave generation in RoF

[faiz iqbal]

hello everyone,
i need help in mm wave generation in radio over fiber. If any one have .osd file.
thanx.

[alistu]

Hi Faiz,

Could you please elaborate more on what you are trying to implement? In case you are trying to mplement a design introduced in a certain paper, I suggest you address the paper in here. Otherwise, some background information on the work would be absolutely helpful. There are OptiSystem examples regarding RoF.

Regards

[faiz iqbal]

hello sir,
i am trying to impliment mm wave genetration technique with four wave mixing..

[alistu]

Hi Faiz,

I suggest you start with the example available in OptiSystem sample files regarding Radio over Fiber. Eventhough you are going to have to make serious changes to the file, the overall implementation will help you understand the RoF architecture and how to go about your own system implementation.

Regards

[faiz iqbal]

Sir,
I have query related to the example in RoF scm/ask. As in radio over fiber there will transmission through fibers as well as wireless transmission. But there is no such transmission in it. I am basically working over whole transmission and need help in that.

[alistu]

It is true that Radio over fiber is used to convey radio signal using optical fiber to make it available later for wireless broadcast, but if you are referring to electrical wireless signal, OptiSystem is only used for optical channels (regarding free space optics cahnnel or visible light communication).

[Dr. Dhiman Kakati]

Hi Faiz, Radio over Fiber (RoF) is not necessarily to have a wireless portion, In radio over fiber technology a radio signal/ is used to modulate the light from the laser source in more practical cases the input data or bit stream is multiplexed with the sine or cosine wave of frequency in the GHz range, and I would suggest you to use nearby 60 GHz as in most of the countries this frequency band is non-lincensed band (try googling for better details).
wireless portion is a specific application which is helpful in case we use a mm wave as there is no need of frequency up conversion or down conversion is required. So the transmitting and receiving station become simpler in term of complexity also.

Regards,
Dhiman

[alistu]

In order to have a general idea about the whole system deign, I suggest you go through the images attached by Dhiman in some other forum page along with the corresponding explanations, which I find quite useful and instructive:

Fiber wireless system

Regards

[faiz iqbal]

Hello dhiman sir,
I am using mm wave thats why i am concerned with wireless portion.

[Dr. Dhiman Kakati]

Hi Faiz, my suggestion would be to design the fiber portion using OptiSystem and then go for the Wireless mm wave communication part in MATLAB and the call inside optisystem. That would be a systematic step by step procedure. You can refer to the block diagrams as Alistu have referred in the above comment #31133. Thanking you..

Regards,
Dhiman

[faiz iqbal]

Thanks a lot, Dhiman sir.

[Dr. Dhiman Kakati]

you are most welcome Faiz.

Regards.

[faiz iqbal]

hello
Can anyone share the .osd file of Radio over fiber communication rather than the the example given in optisystem.
thanx.

[alistu]

Hi Faiz,

I believe Dhiman can definitely help you with this. I would just like to suggest you take a look at a forum page started by Dhiman, in which you can find his attached .osd regarding the transmitter:

frequency separation in dual tone optical signal

Regards

[faiz iqbal]

Thanx Alistu sir,
The above link is related to frequency separation. i need help in basic transmission in RoF. Dhiman sir, if you can help me out here.
Thanx

[Rajguru M. Mohan]

Hi,
As Millimeterwave photonic systems represent a well-suited approach to such broadband
wireless communications because of the large bandwidths that can be supported,
the favorable propagation characteristics of millimeter-wave radiation, and the ability
to remote broadband signals over long distances in optical fiber.
The millimeter-wave (MMW) region of the electromagnetic
spectrum refers to wavelengths on the order
of 1–10 mm, or the frequency range of 30–300 GHz.
MMW technologies have long been used for military
applications, such as radar and missile guidance,1 as
well as scientific purposes, such as radio astronomy
and spectroscopy.
As We have several techniques to generate optical MMW signals based on LDs at over 100 GHz. The simplest way is the optical heterodyne mixing using two distributed feed-back (DFB) lasers with narrow linewidth (<100 kHz). Uni-traveling-carrier photodiode,UTC-PD which utilizes only electrons as active carriers, provides both a large bandwidth and a high-saturation output current at 1.55-mm wavelength.

Thanks,

[Hamza Ali Abbas Khan]

Hello,
Here i would like to add that we are using FSO because of high data rate , secure , fast link design in case of any disaster, cheap compared to all communication , ease of implementation , long distance etc.
long distance can be increased by laser beam (1550nm) with beam control ( which is not much tedious work ) ,turbulence mitigation technique like MIMO . OFDM . OAM , non- linear equalization technique etc.(need more).
AT 1550 nm , there is no much bad effect of weather condition as well as divergence no one can intercept it because we can apply encryption at quantum level. It is so much fast operation (with much wider bandwidth so that you can carry more user at time). If you want to deploy it anywhere else it doesn’t require licence of spectrum
Also it can cover thousand of million of KM like ( please visit inter-satellite communication at mars( upcoming).

I hope it will help.
Thanks

[umer ashraf wani]

got through it
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwixoqCXlcDMAhVYkI4KHftkCcAQFgg-MAI&url=https%3A%2F%2Fwww.osapublishing.org%2Foe%2Fabstract.cfm%3Furi%3Doe-20-2-1769&usg=AFQjCNF8c0E1ZW2_aURY7XWpBe7DcLDAvQ&sig2=eZ6mloczyKQEcyv5QQWFjw
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0ahUKEwixoqCXlcDMAhVYkI4KHftkCcAQFghOMAQ&url=http%3A%2F%2Fpeople.eng.unimelb.edu.au%2Faislam%2FFinal_optexp.pdf&usg=AFQjCNG_WVch9EL6hLUecMcnrtg5wbo5XQ&sig2=HZSViFzVuA8JcJIyBK_i0Q
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=8&cad=rja&uact=8&ved=0ahUKEwixoqCXlcDMAhVYkI4KHftkCcAQFghhMAc&url=http%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpubmed%2F22418378&usg=AFQjCNHYF606nKR4Y3wdWa33WkCbr7r0Qw&sig2=RlQHE6jdiXTeuXAWSfjXJA
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=10&cad=rja&uact=8&ved=0ahUKEwixoqCXlcDMAhVYkI4KHftkCcAQFghyMAk&url=http%3A%2F%2Fspie.org%2FPublications%2FJournal%2F10.1117%2F1.OE.55.3.031116&usg=AFQjCNGS8ZxDd6T6TVD0CGussXROzekviA&sig2=ycNbZKijxcnvp_0CN4FE9w
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=13&cad=rja&uact=8&ved=0ahUKEwjqx5C_lcDMAhWPco4KHXBUDWo4ChAWCC4wAg&url=http%3A%2F%2Fwww.inatel.br%2Fbiblioteca%2Findex.php%2Fmodelos-de-trabalhos%2Fdoc_download%2F6690-techniques-for-mitigating-power-fading-in-mm-wave-radio-over-fiber-systems&usg=AFQjCNHNV2kKQOdOC7zn01brDLk8JGAz9A&sig2=5sUdnLCvKuPLA3LkPOSTuA&bvm=bv.121099550,d.c2E
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=17&cad=rja&uact=8&ved=0ahUKEwjqx5C_lcDMAhWPco4KHXBUDWo4ChAWCEQwBg&url=http%3A%2F%2Farrow.dit.ie%2Fcgi%2Fviewcontent.cgi%3Farticle%3D1011%26context%3Dengdoc&usg=AFQjCNGAEKSmu65fbs0xq5FbYynQNF4Hdg&sig2=G3hKF-IhH-BuNiisK2RoXQ&bvm=bv.121099550,d.c2E

[Rajguru M. Mohan]

Hi Faiz,
I am unable to upload the osd file due to internet connectivity.
Here i am sharing some links which help you understand MM wave generation for Radio over fiber.
https://smartech.gatech.edu/bitstream/handle/1853/24640/iia_zhensheng_200808_phd.pdf
http://www.nature.com/articles/srep19891
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4810219&abstractAccess=no&userType=inst

Thanks,

[Karan Ahuja]

Hi
I would like to mention that the experimental implementation of a wireless transmission system with a 146-GHz carrier frequency which is generated by optical heterodyning the two modes from a monolithically integrated quantum dash dual-DFB source. The monolithic structure of the device and the inherent low noise characteristics of quantum dash gain material allow us to demonstrate the transmission of a 1 Gbps ON-OFF keyed data signal with the two wavelengths in a free-running state at 146-GHz carrier wave frequency. The tuning range of the device fully covers the W-band (75 – 110 GHz) and the F-band (90 – 140 GHz).
I am attaching a link of paper you can refer to it. It will be surely of some help.
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-20-2-1769
Regards

[Karan Ahuja]

Also i want to add that Based on the device described in the previous section,it has implemented an optical– wireless transmission system. The dual wavelength laser was placed on a thermal controlled stage, and two DC input currents are provided. The two optical modes at the output of the Y-coupler were coupled into a lensed fiber followed by an optical isolator. An erbium-doped fiber amplifier (EDFA) amplified the
output signal, which was then modulated with a 1-Gb/s non-return-to-zero (NRZ) on-off keying (OOK) pseudorandom bit sequence (PRBS) data signal of N = 27-1 bits using a MachZehnder modulator (MZM). The modulated optical signal was amplified by a second EDFA, and then opto-electronically (O/E) converted by means of a packaged high-speed antennaintegrated traveling-wave uni-traveling carrier photodiode (TW-UTC-PD). The TW-UTC-PD was integrated with a broadband log-periodic antenna [13] and packaged with a 6 mm diameter Si-lens to provide a gain of approximately 10 dBi at 146 GHz. The receiver was a commercially available Schottky diode based subharmonicallypumped mixer (SHM), that down-converts wireless carrier waves within the 140 – 220 GHz band. Given this range, we have worked with a carrier wave frequency at 146-GHz. In conjunction with a 6x frequency multiplier, a low frequency signal generator was used to provide the mixer local oscillator (LO) signal required to achieve a 2.5 GHz intermediate frequency.
Try going through the paper it will be of very good help
Regards

[Hamza Ali Abbas Khan]

Hello Faiz,
I would like to mention that Due to the huge demand for the mm-wave band in future communication system applications, many researchers are investigating and continue working on the generation of millimeter-wave (mm-wave) signal for radio over fiber (RoF). RoF is an expanding technology that applicable in high channel capacity, wider service coverage and broadband mm-wave access system. However, the limited availability of the RF bands require utilization of the mm-wave frequency bands to meet the obligation for higher signal bandwidth and overcome the frequency congestion in the future RoF-based optical-wireless access networks. Broadband wireless communication has introduced great interest in mm-wave bands due to its wide transmission bandwidth and also the opportunity of frequency reuse. This paper mainly focuses on the mm-wave carrier generation techniques for radio over fiber including: optical heterodyning, external modulation, optical transceiver, and up- and down-conversion.
Refer to the link of one paper. It will be helpful
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=4810219&abstractAccess=no&userType=inst
Thanks

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