Multibeam FSO

[Marvi grover]

Hello Everyone

Can anybody guide on what is a multibeam FSO system and how does it work. I am not able to understand its working.
i shall be thankful for any help provided.
i am also attaching a .osd file of the multibeam FSO. please check if it is a correct system.
Regards

[prakash jat]

modfiy your file first by setting power ratio as 1 1 1 1

[prakash jat]

hi marvi

i think you should change couple of think in your osd file
1. you have split your signal after power combiner and the merge back into one, it does’t mean anything else
2. you are combining your three beam direct through power combiner at receiver, you should use detect your signal first after that combine
3.this osd is valid only when we have uncorrelated fso medium not for correlated(i mean spacing between two receiver)

[Marvi grover]

Hello Sir
thank you so much for taking a look at the system.
do you mean to say that i should detect each beam using a seperate receiver??

[prakash jat]

sure

[umer ashraf wani]

go throgh these links
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwiN0JS6xcTMAhWIGo4KHSsOBsgQFgg-MAU&url=http%3A%2F%2Foptiwave.com%2Fforums%2Ftopic%2Fmultibeam-fso%2F&usg=AFQjCNFpL72tOKj0-X4h6lm1oSUX3mQlHQ&sig2=xgpqyuUAv_2bgWYP9XP0Fw
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwiN0JS6xcTMAhWIGo4KHSsOBsgQFggcMAA&url=http%3A%2F%2Fwww.sciencedirect.com%2Fscience%2Farticle%2Fpii%2FS0030402611003408&usg=AFQjCNFwX6q6T_zfS_UIc_Q5JVyFxv6d0A&sig2=yNCUTQ0ue67xQ7ic9zkhzQ
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwiN0JS6xcTMAhWIGo4KHSsOBsgQFggkMAE&url=http%3A%2F%2Flink.springer.com%2Farticle%2F10.1007%252Fs11107-014-0482-y&usg=AFQjCNE6Bef72zGKSrFXiaPPNaEWhdZzTQ&sig2=Ghx0N3D4XIUR6KI39pDobA
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwiN0JS6xcTMAhWIGo4KHSsOBsgQFggtMAI&url=http%3A%2F%2Fdl.acm.org%2Fcitation.cfm%3Fid%3D2747262&usg=AFQjCNHCiBjK5fZhNKqG_Ob6KsEgq9hd1w&sig2=ascXp_yt7FYRftLrsSciDg
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0ahUKEwiN0JS6xcTMAhWIGo4KHSsOBsgQFgg8MAQ&url=https%3A%2F%2Fwww.researchgate.net%2Fpublication%2F273917945_Hybrid_WDMmultibeam_free-space_optics_for_multigigabit_access_network&usg=AFQjCNGiU_y8Pw4CkWywa2H3qsOXrwysEA&sig2=XsAa9rwVf0oJuCNQrxzZAA
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=11&cad=rja&uact=8&ved=0ahUKEwibq5jdxcTMAhXVBo4KHbuTDkI4ChAWCBowAA&url=http%3A%2F%2Fwww.academia.edu%2F15636180%2FHybrid_WDM_multibeam_free-space_optics_for_multigigabit_access_network&usg=AFQjCNGsqU0DmjCIcEbPnsroyrjWnLnT6Q&sig2=r9SddiXGB7IEYEhOxG4UWQ&bvm=bv.121421273,d.c2E
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=14&cad=rja&uact=8&ved=0ahUKEwibq5jdxcTMAhXVBo4KHbuTDkI4ChAWCCcwAw&url=http%3A%2F%2Flink.springer.com%2Fcontent%2Fpdf%2F10.1007%2Fs11107-014-0482-y.pdf&usg=AFQjCNEDsR2HgZjUZe1eeAxVM8N_1kO6Rg&sig2=03ccNn01f4LQYE4T6AJ3EA&bvm=bv.121421273,d.c2E
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=16&cad=rja&uact=8&ved=0ahUKEwibq5jdxcTMAhXVBo4KHbuTDkI4ChAWCDUwBQ&url=http%3A%2F%2Fijarece.org%2Fwp-content%2Fuploads%2F2015%2F05%2FIJARECE-VOL-4-ISSUE-5-1125-1131.pdf&usg=AFQjCNFksFkPC-0RQY92-yeFexM0RzT5uA&sig2=iEmxNm2y3LxLWOFMdnn1MA&bvm=bv.121421273,d.c2E
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=18&cad=rja&uact=8&ved=0ahUKEwibq5jdxcTMAhXVBo4KHbuTDkI4ChAWCD4wBw&url=http%3A%2F%2Fcsmaster.sxu.edu%2Falzoubi%2FFSO%2520Presentation%2520Phillipps.ppt&usg=AFQjCNGb7BcMpAww-Pfrqs4gqr5EcfXaQQ&sig2=FqLqMGIVK4rvX9zav6PSvw&bvm=bv.121421273,d.c2E

[Karan Ahuja]

Hello
I want to mention that multibeam free-space optics (FSO) is a promising technique to overcome atmospheric attenuation due to tropical rain and to fulfill the growing demand for increased communication bandwidth and scalability. In this study, a hybrid four channel 1.25-Gb/s WDM/multibeam FSO network having four wavelengths with standard downlink channel spacing of 0.8 nm (100 GHz) is proposed. The hybrid WDM/multibeam FSO technique improved the performance of an FSO link in terms of the received power, link distance, data rate, and scalability. The proposed technique provided access data to four end users, each at a data rate of 1.25 Gb/s along an FSO link distance of 1,100 m.
I am attaching a link of paper. This may help you
http://link.springer.com/article/10.1007%2Fs11107-014-0482-y
Regards

[Karan Ahuja]

I also want to mention that in the WDM-based access, the bandwidth demand has increased rapidly; thus, it is a potential solution for future data transport with regard to all optical wide area networks . In fiber optics communication, WDM is well known and used extensively. Several single-beam FSO WDM transmission systems have been successfully demonstrated where the different wavelengths are carried by one beam. Even though more than one wavelength is used to increase the data rate, after all, this system lies under a single-beam attenuation affect. In the current study, the performance and applicability of the four-beam FSO system in rainy weather are proposed and investigated using WDM. The study is conducted based on simulation using on-site attenuation and rain intensity measurements. It considers the received power, geometrical losses, and atmospheric losses due to heavy rain.
I hope this is helpful to you
Regards

[Hamza Ali Abbas Khan]

Hello Marvi
I agree with most of the replies. I want to add that the hybrid WDM/multibeam FSO network has provided a significant improvement in the link distance, received optical power, geometrical loss, and scalability. The network performance has been analyzed, and the study concludes that a maximum channel spacing beyond 0.4 nm is applicable for this network. The power receiver sensitivity difference of the receiver for different wavelengths at a BER of 10^(−9) was noted to be a small value, which is approximately less than 1 dB. Meanwhile, in terms of scalability, four users can access data each at 1.25 Gb/ss, which is considered sufficient compared to conventional multibeam technique accessing data to only one EU. The hybrid WDM/multibeam FSO network can be a good candidate to solve the last mile problem and the rapid increase in capacity demand without requiring new FSO transceivers. At the moment, the evaluation is going on for a real-time system operating in heavy rain as compared to simulation presented here. In the future, increasing the capacity of the hybrid WDM/multibeam FSO network can be studied and implemented to reach up to 32 channels.
The link provided by Mr. Karan should help you.
Thanks

[Marvi grover]

thankyou so much everyone for your valuable suggestions. I will have a look into them.

Regards
marvi

[Karan Ahuja]

You are welcome marvi 🙂

[Karan Ahuja]

I hope this will be beneficial to you.
try to go through the links too that may also help
Regards

[burhan num mina llah]

Hello Marvi,

I would like to mention that multibeam FSO network has provided a significant improvement in the link distance, received optical power, geometrical loss, and scalability. The network performance has been analyzed, and the study concludes that a maximum channel spacing beyond 0.4 nm is applicable for this network. The power receiver sensitivity difference of the receiver for different wavelengths at a BER of 10−9 was noted to be a small value, which is approximately less than 1 dB. Meanwhile, in terms of scalability, four users can access data each at 1.25 Gb/ss, which is considered suffi- cient compared to conventional multibeam technique accessing data to only one EU. The hybrid WDM/multibeam FSO network can be a good candidate to solve the last mile problem and the rapid increase in capacity demand without requiring
new FSO transceivers. At the moment, the evaluation is going on for a real-time system operating in heavy rain as compared to simulation presented here. In the future, increasing the capacity of the hybridWDM/multibeam FSO network can be studied and implemented to reach up to 32 channels.

Refer to this paper http://download.springer.com/static/pdf/356/art%253A10.1007%252Fs11107-014-0482-y.pdf
Hope this will help

Regards

Burhan

[Author]

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