Amplifiers

This topic has 23 replies, 9 voices, and was last updated 8 years, 9 months ago by Manoj Kumar.

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- March 15, 2016 at 1:58 pm #32892
  
  ZULKARNAIN
  Participant
  
  What is the difference between using Reflective Semiconductor Optical Amplifiers(RSOA) or MZM(Mach-Zehnder Modulator) in a design. Does both of these amplifiers give same results or not.Also explain the limited bandwidth of RSOA if i am not mistaken.
  with regards
- March 16, 2016 at 12:54 am #32916
  
  Aabid Baba
  Participant
  
  Hello zulkarnian,
  First of all i would like to mention that RSOA and MZ modulator are two different things. One is amplifier and the other is modulator that modulated the optical signal with the information signal. No doubt , both can be put into various applications and differently like MZ can be used to design a switch etc but it is primarily used as modulator. However, RSOA can be used as a modulator but i have not heard of MZ being used as an amplifier.
  
  Regards
- March 16, 2016 at 12:57 am #32917
  
  Aabid Baba
  Participant
  
  Here i am posting a link of the topic where Damian has uploaded two osd files suggesting Reflective semiconductor optical amplifier ( RSOA) being used for different applications ( being used as modulator). Please refer to the post and go through it and i hope you get a clear distinction between the two.
  
  Reflective Semiconductor Optical Amplifiers [Optical System]
  
  I hope it helps you to some extent.
  Regards
- March 16, 2016 at 1:10 am #32922
  
  FAYIQA NAQSHBANDI
  Spectator
  
  HI ALL
  I agree with aabid baba. Both the components are different if one is modulator the other is amplifier..
  Zulkarnain i will suggest you to go through Damian sirS’ post and it will be very convenient for you to differentiate between the two.. You may also go through the “component help” of both the components which is a basic thing you can do. It would give u an idea for sure.
  Thanks and regards
- March 16, 2016 at 1:20 am #32925
  
  Ranjeet Kumar
  Participant
  
  Hello zulkarnian,
  I agree to Aabid sir that RSOA and MZ modulator are two different things. One is amplifier and the other is modulator that modulated the optical signal with the information signal. However, RSOA can be used as a modulator but i have not heard of MZ being used as an amplifier.
  
  Reflective Semiconductor Optical Amplifiers [Optical System]
  
  http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5185149&abstractAccess=no&userType=inst
  
  Reflective Semiconductor Optical Amplifier (RSOA)
  
  https://books.google.co.in/books?id=gR9OUXpjQ90C&pg=PA58&lpg=PA58&dq=Reflective+semiconductor+optical+amplifier+(+RSOA)&source=bl&ots=7ZwCa_vgU6&sig=0OKGAGYbizxpY0IBL59OWFcpZYg&hl=en&sa=X&ved=0ahUKEwiZ0v2QusTLAhUCkpQKHQWIAwU4ChDoAQg-MAg#v=onepage&q=Reflective%20semiconductor%20optical%20amplifier%20(%20RSOA)&f=false
  https://www.researchgate.net/publication/235984030_Modeling_and_Simulation_of_a_Reflective_Semiconductor_Optical_Amplifier_Modulator_Using_X-Parameters
  these are reference which may be helpful for you
- March 16, 2016 at 1:41 am #32929
  
  Tanveer
  Participant
  
  Hello Zulkarnain…
  As clearly explained by aaabid baba the difference between the two, i would like suggest you to go through one of the previous post here i am attaching the link of that where Reflective Semiconductor Optical Amplifiers are already discussed…
  
  Reflective Semiconductor Optical Amplifiers [Optical System]
  
  More allistu had briefly explained Mach-Zehnder Modulator in the previous posts…..link of that is
  
  Mach-Zehnder Modulator
  
  Hope it helps
  best regards
- March 16, 2016 at 5:52 am #32941
  
  Naazira Badar
  Participant
  
  Hi Zulkarnain..
  
  As mentioned already, these are two different things, employed for two entirely different purposes.
  
  Regards.
- March 16, 2016 at 9:12 am #32953
  
  Tanveer
  Participant
  
  Hello Zulkarnain…..
  For the bandwidth of Reflective Semiconductor Optical Amplifiers you should go through these posts
  
  Testing RSOA modulation bandwidth?
  
  performance & Bandwidh limitation in RSOA
  
  hope it helps
  with regards
  tanveer
- March 16, 2016 at 2:52 pm #32965
  
  SAHIL SINGH
  Participant
  
  Hi Zulkarnain..
  
  As mentioned already,Reflective Semiconductor Optical Amplifiers(RSOA) or MZM(Mach-Zehnder Modulator) are two completely different things,Also Ranjeet has mentioned it correctly that One is amplifier and the other is modulator that modulated the optical signal with the information signal.
  
  Regards
  
  Sahil Singh
- March 22, 2016 at 7:55 am #33541
  
  ZULKARNAIN
  Participant
  
  THANK YOU ALL FOR YOUR RESPONSES.
  I UNDERSTOOD THAT BOTH Reflective Semiconductor Optical Amplifiers(RSOA) or MZM(Mach-Zehnder Modulator) CAN BE USED AS MODULATORS AND ONLY RSOA AS AMPLIFIER.
- March 22, 2016 at 7:59 am #33542
  
  ZULKARNAIN
  Participant
  
  I read somewhere about the limited bandwidth of Reflective Semiconductor Optical Amplifiers(RSOA). Will someone please explain this?
- March 22, 2016 at 8:05 am #33543
  
  ZULKARNAIN
  Participant
  
  Also as i am able to understand that rsoa is acting as both modulator as well as amplifier but MZM acts as modulator alone,so by using rsoa in a design should give better results as compared to MZM.
  But using MZM in my design it is giving good results as compared to rsoa. Can anyone explain why is this happening in my design?
  with regards…
- March 22, 2016 at 2:46 pm #33560
  
  Naazira Badar
  Participant
  
  Hi Zulkarnain..
  
  Well, it is because of your post I got to know that RSOA could be used as a modulator as well. So thankyou for that.
  
  And as far as your confusion is concerned, here is the link to a relevant post :
  
  performance & Bandwidh limitation in RSOA
  
  You can check reply #18246 and see if that paper he has mentioned helps.
  
  Regards
  Naazira.
  - March 25, 2016 at 1:08 pm #33856
    
    ZULKARNAIN
    Participant
    
    hi naziraa ….
    you are always welcum…
    with regards
- March 23, 2016 at 9:41 am #33608
  
  jyoti raina
  Spectator
  
  hi all.. i hv a question plz can u people tel me what is the difference between different amplifiers present in the optical library of the optical amplifiers..they all are optical then why do we have separate optical amplifiers there..wht is the difference between those and the other amplifiers like EDFA raman etc ect..
  i wil be thankful to u people.
  - March 25, 2016 at 12:57 pm #33851
    
    ZULKARNAIN
    Participant
    
    hi jyoti raina…
    i think this topic has already been discussed on the forum,so you should refer to the same for your query.
    For your reference i am attaching a link which might be of some help to you.In this topic one of the forum master has suggested to use raman amplifier as it gives better results than other amplifiers and the reason maybe the gain flattering phenomena in raman amplifier and usage of external pump.
    
    Optical Amplifiers
    
    with regards…
- March 23, 2016 at 1:27 pm #33624
  
  Ranjeet Kumar
  Participant
  
  hi,
  The component simulates a reflective semiconductor optical amplifier (RSOA) model with bulk material as the active element. This SOA model is based on the numerical solution of a set of coupled differential equations that describe the interaction between the carrier density and photon rates along the active layer length. The rate and propagation equations solved in this model are similar to the ones described in the Wideband Traveling Wave SOA technical background, however the value of the injection current here is considered as an input signal allowing the modulation of the optical signal by the SOA.
  This component also considers the possibility of sensing the differences in voltage produced at the bias electrode of the single-section SOA.
  - March 24, 2016 at 8:10 am #33693
    
    jyoti raina
    Spectator
    
    hi ranjeet sir. i am not using RSOA..
    i want to know the difference between the amplifiers different amplifiers present in the optical library of the optical amplifiers.. i hv seen many papers and examples using either edfa or raman amplifier or optical amplifier..nw my confusion is which optical amplifier to use bcz thr r many amplifiers in that folder..so plz help in that.
    thanx in advance
  - March 25, 2016 at 1:06 pm #33855
    
    ZULKARNAIN
    Participant
    
    hi ranjeet kumar…
    thank you for explaining the difference between the two devices.
    with regards..
- March 24, 2016 at 8:16 am #33697
  
  Naazira Badar
  Participant
  
  Yeah. Jyoti . A lot of people have a confusing in that regard. A number of discussions ate already available on optisystem forum for the same.
  I suggest you to go through those.
  
  Regards.
  Naazira.
  - March 24, 2016 at 10:39 am #33720
    
    jyoti raina
    Spectator
    
    thanx fr the help. i wil try to search and look at those to understand the main difference. thnx agn
- March 24, 2016 at 2:10 pm #33748
  
  Ranjeet Kumar
  Participant
  
  Hi Jyoti,
  For simple Wdm system we could use EDFA amplifiers in addition to this we should use symmetric compensation technique to get better results as it compensate the losses in fiber caused by dispersion.
  In long haul DWDM sytsem we should use hybrid (EDFA+ Raman) amplifier for better results.
  We should use different amplifiers according to requirement as both amplifiers have advantage and disadvantages as
  
  Advantages of EDFA
  EDFA has high pump power utilization (>50%)
  Directly and simultaneously amplify a wide wavelength band (>80nm) in the 1550nm region, with a relatively flat gain
  Gain in excess of 50 dB
  Low noise figure suitable for long haul applications
  
  Disadvantages of EDFA
  Size of EDFA is not small
  It can not be integrated with other semiconductor deviecs
  
  Advantages of Raman amplifier
  Variable wavelength amplification possible
  Compatible with installed SM fiber
  Can result in a lower average power over a span, good for lower crosstalk and Very broadband operation may be possible
  
  Disadvantages of Raman amplifiers
  High pump power requirements, high pump power lasers have only recently arrived
  Sophisticated gain control needed
  Noise is also an issue
- March 24, 2016 at 3:16 pm #33752
  
  SAHIL SINGH
  Participant
  
  Hi Ranjeet Kumar,
  
  Thanks for summarising the various important advantages and disadvantages of the raman amplifiers… Indeed the information provided by you is very helpful… Appreciate your efforts…
  
  Regards
  
  Sahil Singh
- April 11, 2016 at 7:10 am #36243
  
  Manoj Kumar
  Participant
  
  Hello zulkarnian,
  I agree to Aabid sir that RSOA and MZ modulator are two different things. One is amplifier and the other is modulator that modulated the optical signal with the information signal. However, RSOA can be used as a modulator but i have not heard of MZ being used as an amplifier.
  
  Reflective Semiconductor Optical Amplifiers [Optical System]
  
  http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5185149&abstractAccess=no&userType=inst
  
  Reflective Semiconductor Optical Amplifier (RSOA)
  
  https://books.google.co.in/books?id=gR9OUXpjQ90C&pg=PA58&lpg=PA58&dq=Reflective+semiconductor+optical+amplifier+(+RSOA)&source=bl&ots=7ZwCa_vgU6&sig=0OKGAGYbizxpY0IBL59OWFcpZYg&hl=en&sa=X&ved=0ahUKEwiZ0v2QusTLAhUCkpQKHQWIAwU4ChDoAQg-MAg#v=onepage&q=Reflective%20semiconductor%20optical%20amplifier%20(%20RSOA)&f=false
  https://www.researchgate.net/publication/235984030_Modeling_and_Simulation_of_a_Reflective_Semiconductor_Optical_Amplifier_Modulator_Using_X-Parameters
  these are reference which may be helpful for you
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