- This topic has 11 replies, 5 voices, and was last updated 8 years, 9 months ago by Ranjeet Kumar.
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February 5, 2016 at 4:27 am #29472Debanjan SarkarParticipant
Hi
Is 67% RZ-DPSK signal same as CSRZ-DPSK Signal ??
Thank you -
February 5, 2016 at 5:28 am #29478alistuParticipant
Hi Debanjan,
They are not the same. I found the following explanation on difference between RZ and CSRZ quite useful:
Carrier suppressed return to zero (CSRZ) is the advanced modulation format used in optical communication.The difference between CSRZ and conventional RZ is that the CSRZ signal has the ‘π’ phase shift between adjacent bits. This phase alternation, in the optical domain, produces no DC component; thus, there is no carrier component for CSRZ.
Regards
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February 5, 2016 at 5:33 am #29479Alessandro FestaParticipant
Hi,
I found an interesting article at this link (http://ee.stanford.edu/~jmk/pubs/RZ.PSD.JLT.pdf) saying that 67% RZ and CSRZ are the same…
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February 5, 2016 at 5:43 am #29480alistuParticipant
Hi Alessandro,
Thank you for correcting my mistake. My answer was in a general sense and I hadn’t noticed “67%” in Debanjan’s statement. But thanks for pointing it out.
Regards
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February 5, 2016 at 7:22 am #29483Alessandro FestaParticipant
You are welcome Alitsu. I actually was not aware of this before reading the article I linked!
Best Regards,
Alessandro
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February 6, 2016 at 9:18 am #29492Debanjan SarkarParticipant
Thank you both of you.
I have one more confusion..i have one example in .osd of 66% RZ dpsk. Is it same as 67% RZ dpsk??-
February 7, 2016 at 5:22 am #29494Alessandro FestaParticipant
Hi Denanjan,
you are welcome! I suppose the example with 66% is the same as 67%…this modulation is actually 2/3 which can be approximated with 66% or 67%!
Best Regards,
Alessandro
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February 8, 2016 at 4:01 am #29509Debanjan SarkarParticipant
thank you. and what about 66% dpsk and 67% rz dpsk .are they same? can any one suggest me any paper or book so that i clear my doubt regarding these things?
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February 8, 2016 at 6:03 am #29510alistuParticipant
Hi Debanjan,
They are not necessarily the same. 66% DPSK can be using any return-to-zero modulation format such as RZ and CSRZ as far as I am concerned. I suggest you study the basic concept and the definition of these signal formats to better understand their differences. For example, you can go with the paper “Advanced modulation formats for fiber optic communication systems” by Mauro and go through the references if necessary, or you can simply google each format.
Regards
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February 8, 2016 at 6:33 am #29511Alessandro FestaParticipant
I am sorry, i did not read carefully that yoy meant 66 dpsk and 67 RZ dpsk…I apoligize for my answer.
Regards,
Alessandro
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February 18, 2016 at 1:02 am #29844aasif bashir darParticipant
let me differentiate 66%rz-dpsk and 67%CSRZ-dpsk for u.
66%rz-dpsk: means that the duty cycle of return to zero (RZ) modulation format is 66%.hence we can have N%rz-dpsk depending on duty cycle of RZ data format.
CSRZ-dpsk:means the amount of the carrier that is suppressed in the process of modulation.67%CSRZ-dpsk thus means that carrir is suppressed by 67% of its original strength.
thus these are completely opposite of one another.
with regards
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March 8, 2016 at 2:17 am #31844Ranjeet KumarParticipant
Hi,
I think both are different 67% rz DPSK means duty cycle of RZ is 67% but In CSRZ carrier is suppressed and rz having 50% duty cycle.
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