67% RZ dpsk

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

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…

I am sorry, i did not read carefully that yoy meant 66 dpsk and 67 RZ dpsk…I apoligize for my answer.

Regards,

Alessandro

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

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.