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    • #36777
      Ankita Sharma
      Participant

      Hello everyone,

      I just want to ask for the simulation of GPON based FTTH,how do we find BER ? Is it preferable to use 3R before BER analyzer or connect BER analyzer with PRBS and NRZ pulse generator? Which method will give the accurate results?

      Hope to hear from you soon

      Thanks

    • #36833
      shafeen al yasin
      Participant

      Hi dear,

      Both ways are correct. Either connecting a 3R regenerator or connecting BER analyzer with PRBS and NRZ pulse generator , both are correct. I will suggest you to use former because you will have improved signal quality. I hope it will help you..

      Regards
      Shafeen

    • #36836
      Manoj Kumar
      Participant

      Hi ankita,

      I agree with Shafeen here that both the ways are correct… Hope this helps…

      Regards

    • #36845
      SAHIL SINGH
      Participant

      Hi ANKITA,

      It is rightly mentioned by Shafeen and Manoj that both ways are correct. Either connecting a 3R regenerator or connecting BER analyzer with PRBS and NRZ pulse generator… Hope this helps

      Regards
      Sahil Singh

      • #36955
        shafeen al yasin
        Participant

        Hello Sahil,
        I find both ways correct. And i have tried it myself. Anyways thanks for supporting..

        Regards
        Shafeen

    • #36853
      Ankita Sharma
      Participant

      Hi shafeen,

      Thanks for the information…

      Regards
      Ankita

      • #37298
        shafeen al yasin
        Participant

        Hi Ankita
        You are welcome. It feels an immense pleasure to help people
        Regards
        Shafeen

    • #36854
      Ankita Sharma
      Participant

      Hi Sahil Sir,

      Thanks for the information… You have always provided your valuable response…

      Regards
      ANKITA

    • #36855
      SAHIL SINGH
      Participant

      Hi ankita,

      You are welcome…

      Regards
      Sahil Singh

    • #36868
      Rajguru M. Mohan
      Participant

      Hi Ankita Sharma,
      We have different samples of PON networks in Metro and access systems folder in optisystem samples files namely XGPON, GPON, BPON and others networks design. We could FTTH networks using XGPON, GPON, BPON OCDMA and others technologies.
      Fiber to the home (FTTH) is an optical access
      network architecture that uses optical fibers to replace all or part of
      the metallic cables to the end-user. Using OptiSystem we can
      explore the performance of different architectures for FTTH
      networks.
      Go through all these samples files by simulating them.
      Here i am uploading The osd file of GPON.
      You will also find information about FTTH in pdf file of FTTH networks.

      Hope this will help you.
      Regards
      Rajguru

    • #36901
      nagesh kuknoor
      Participant

      Hi All,
      Is it possible?
      Do both methods give same result?
      I have never used BER analyzer with PBRS and NRZ directly. Can someone provide some snapshot how to do it?

      Regards

    • #36930
      Domail Singh
      Participant

      Hi Ankita,
      I agree with Shafeen. She has correctly mentioned it. We can do it either way. I think it should help you.

      Regards
      Domail

    • #36938
      Manoj Kumar
      Participant

      Hi Rajguru,

      Thanks for the information..

      Regards

    • #36958
      gaurav rajput
      Participant

      HI everyone,

      It has been correctly mentioned by forum members that we can do it either way…

      Regards

      • #37300
        shafeen al yasin
        Participant

        Hi Gaurav,
        You are welcome anytime.

        Regards
        Shafeen

    • #37133
      jyoti raina
      Spectator

      hi all..
      as mentioned by shafeen mam we can do it either way..both are right..there has been a discussion already on this topic..
      with regards
      jyoti

      • #37301
        shafeen al yasin
        Participant

        Hello jyoti

        Thank you for appreciation.
        Regards
        Shafeen

    • #37162
      Ankita Sharma
      Participant

      Hi all,

      Thanks everyone… Truly appreciate your efforts…

      Regards
      Ankita

      • #37554
        Domail Singh
        Participant

        Hi Ankita
        You are welcome. Glad it helped.

        Regards
        Domail

    • #37175
      Remo De Suza
      Participant

      Hello Ankita.
      This topic has been already discussed. Please refer to the links for further information regarding this.

      3R Regenerator

      I hope this will be of some help.
      Regards
      Remo

      • #37227
        nagesh kuknoor
        Participant

        Hi Remo,
        thank you for sharing the links. Indeed very very helpful. I had no idea of connecting BER directly with NRZ and PBRS. Thank you.

        Regards

    • #37211
      Rajguru M. Mohan
      Participant

      You are welcome Manoj kumar
      Thank for your appreciation.
      I will keep sharing such valuable information.

    • #37226
      nagesh kuknoor
      Participant

      Hi All,
      Thank you so much everyone for sharing it. It was very helpful indeed.
      Regards

    • #37316
      Manoj Kumar
      Participant

      Hi Rajguru,

      Your efforts are truely worth appreciating…

      Regards

    • #37395
      Rajguru M. Mohan
      Participant

      Hi Ankita,
      Here are some links which help you.

      GPON BER Measurement




      Protocol implementation using Optiwave

      In addition to this i would suggest you to simulate sample files related to PON.

      • #37556
        Domail Singh
        Participant

        Hello Rajguru
        Thank you for sharing the videos.

        Regards
        Domail

    • #37526
      Manoj Kumar
      Participant

      Hi Rajguru,

      Really valuable information provided by you…
      A nice video as well…

      Regards

    • #37545
      Ankita Sharma
      Participant

      Hi Rajguru,

      Thanks for the information.. Will surely try to look into it…

      Regards
      Ankita

    • #37576
      deepak jha
      Participant

      Hi all,

      Avery discussion on the topic..Highly appreciate the efforts of Rajguru…

      Regards

    • #37698
      Rahul Tiwari
      Participant

      Hi Ankita,

      I agree with Remo that topic has already been discussed on the forum..

      Regards
      Rahul Tiwari

    • #38413
      Rajguru M. Mohan
      Participant

      You are most welcome Manoj Kumar.
      Thank you for your agreement and consent.

    • #38414
      Rajguru M. Mohan
      Participant

      Hi Nagesh,
      First you connect PBRS to NRZ,
      As BER analyzer has three input ports , so you should connect
      the output port of PBRS to most upper input port of BER analyzer.
      After that The output port of NRZ will be connected to middle port of BER analyzer.
      and finally the final output will be connected to 3rd or bottom port of BER analyzer.

      Hope you will understand

      Thanks and regards,
      Rajguru

    • #38610
      Rajguru M. Mohan
      Participant

      Hi Ankita,

      A PON system utilizes a passive splitter that takes one input and splits it to “broadcast” signals downstream to many users. This reduces the cost of the system substantially by sharing one set of electronics and an expensive laser with up to 32 homes. Upstream, the passive splitter acts as a combiner to connect all users to the same shared PON port. An inexpensive laser is used for the home to send signals back to the FTTH system in the central office.
      Different technologies of GPON are:
      BPON, or broadband PON, was the most popular PON application in the beginning. BPON uses ATM as the protocol. ATM is widely used for telephone networks and the methods of transporting all data types (voice, Internet, video, etc.) are well known. BPON digital signals operate at ATM rates of 155, 622 and 1244 Mb/s.
      Downstream digital signals from the CO through the splitter to the home are sent at 1490 nm. This signal carries both voice and data to the home. Video on the first systems used the same technology as CATV, an analog modulated signal, broadcast separately using a 1550 nm laser which may require a fiber amplifier to provide enough signal strength to overcome the loss of the optical splitter. Video could be upgraded to digital using IPTV, negating the need for the separate wavelength for video. Upstream digital signals for voice and data are sent back to the CO from the home using an inexpensive 1310 nm laser. WDM couplers separate the signals at both the home and the CO.

      Thanks,

    • #38611
      Rajguru M. Mohan
      Participant

      Hi Ankita,
      We have different technologies of PON having different data rate and other parameters, which i like to share :
      GPON, or gigabit-capable PON, uses an IP-based protocol and either ATM or GEM (GPON encapsulation method) encoding. Data rates of up to 2.5 Gb/s are specified and it is very flexible in what types of traffic it carries. GPON enables “triple play” (voice-data-video) and is the basis of most planned FTTP applications in the near future. In the diagram above, one merely drops the AM Video at the CO and carries digital video over the downstream digital link.

      EPON or Ethernet PON is based on the IEEE standard for Ethernet in the First Mile. It uses packet-based transmission at 1 Gb/s with 10 Gb/s under discussion. EPON is widely deployed in Asia. The system architecture is the same as GPON but data protocols are differenet.

      Gpon and EPON are different.

      PON System Specification Summary

      BPON GPON EPON
      Standard ITU-T G.983 ITU-T G.984 IEEE 802.3ah (1 Gb/s),IEEE 802.3av (10Gb/s)
      Downstream Bitrate 155, 622 Mb/s,1.2 Gb/s 155, 622 Mb/s, 1.2, 2.5 Gb/s 1.25 Gb/s, 10.3 Gb/s
      Upstream Bitrate 155, 622 Mb/s 155, 622 Mb/s, 1.2, 2.5 Gb/s 1.25 Gb/s, 1.25 or 10.3 Gb/s
      Downstream Wavelength 1490, 1550 1490 1490, 1550
      Upstream Wavelength 1310 1310 1310
      Protocol ATM Ethernet over ATM/IP or TDM Ethernet
      Video RF at 1550 or IP at 1490 RF at 1550 or IP at 1490 IP Video
      Max PON Splits 32 64 16
      Power Budget
      ~13dB (min) to 28dB (max) w/32 split ~13dB (min) to 28dB (max) w/32 split

      Coverage <20 km <60 km <20 km

      Thanks,

    • #38612
      Rajguru M. Mohan
      Participant

      Hi Ankita,
      I also would like to share FTTH Access Topologies:
      ƒ —Tree architectures
      Passive Optical Network (PON) technology
      ƒ —-Star architectures
      Point-to-point connection of customers to
      switches in a star topology

      As we have discussed about BPON, GPON, EPON.
      Main Issues with PONs
      ƒ Data sent to all users on the tree: inefficient Video multicast & VoD
      IGMP Proxy and snooping with limited support. IGMP process distributed between OLT(Proxy) and ONT(Snooper)
      instable. Zapping degrades with large number of channels selected. No state of IGMP on ONT kept. Troubleshooting
      by “mirroring” PONT tree, no focus on one sub (trace per user) possible Asymmetrical
      ƒ All FTTH deployments that we are aware of universally assume a take rate of 25…35%. Only 25-35% of
      interfaces need to be accommodated on switches in a Eth. P2P scenario rather than 100% in PON.
      ƒ Strong encryption required to prevent eavesdropping.

      So, we have shifted towards other technologies too.

      Thanks,

    • #38627

      Hi All,
      I would like to add that We have different samples of PON networks in Metro and access systems folder in optisystem samples files namely XGPON, GPON, BPON and others networks design. We could FTTH networks using XGPON, GPON, BPON OCDMA and others technologies.Fiber to the home (FTTH) is an optical accessnetwork architecture that uses optical fibers to replace all or part of the metallic cables to the end-user. Using OptiSystem we can explore the performance of different architectures for FTTH networks.
      Thanks

    • #49177
      MEET KUMARI
      Participant

      Sir Why in GPON upstream transmitter power (e.g. -3dBm) is less than downstream transmitter power (e.g. 5dBm)?

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