[varinder singhParticipant]

hello syed
you are talking about the optical communication in sea water…optical communication through sea water is possible ….but not without optical fibres may be in future…
with regards

[varinder singhParticipant]

helo sahil,
thanks for helping the syed ..
regards
varinder singh

[varinder singhParticipant]

hello..
i think qpsk can be used as dpsk …so that you can convert into dqpsk..qpsk only transfer two bits and dpsk transfer only one bit…so you can convert simply into dqpsk..
with regards

[varinder singhParticipant]

hiii atul…
the problem which you are facing may be due to broken if the fiber ..please check the fiber or replace it with new one..may be something happen..
with regards varinder singh rajput

[varinder singhParticipant]

helo ..sahil..
i mean if she want information about bessel filter and lpf …then for that she must use that book..
i read that book during my btech days..
nothing more.
with regards

[varinder singhParticipant]

hii.. sahil.
itz my pleasure
with regards

[varinder singhParticipant]

helo naazira..
first of all thanks for sharing your problem on optiwave forums..from my point of view i think lpf filters mostly commnly used for demodulation purpose in communication sytem..but laser light or optical light frequency can be used as carrier frequency for modulation..so mostly we are using lpf at the receiver end..and bessel filter are mostly commnly used for frequency modulation…or in wideband fm.
if you require more information about this topic ..then use sanjay sharma.. it will help you..
with regards

[varinder singhParticipant]

helo sir..
if you are working on fttx.. then these papers will help you..
i hope you were able to do it.
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6645106
http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5357385
with regards

[varinder singhParticipant]

hiiii…everybody…
thanks for sharing info with me…
i really appreciate .
with regards

[varinder singhParticipant]

thanks ranjeet ,,,,,,,,,,,,,,,,,,,

[varinder singhParticipant]

helo dhiman…..
you may change the data rate e.g. 20 gbps, 40 gbps and minimize channel spacing to 50ghz and 25 ghz .
And you will find the difference in results.i hope you will do it.
with regards

[varinder singhParticipant]

thanks aabid for providing this information to the jyoti raina …….i appreciate your effort

thanks with regards

[varinder singhParticipant]

hiiii .jyoti,
i got ur problem………..A perfect eye diagram contains an immense amount of parametric information about a signal, like the effects deriving from physics, irrespective of how infrequently these effects occur. If a logic 1 is so distorted that the receiver at the far end can misjudge it for logic 0, you will easily discern this from an eye diagram. What you will not be able to detect, however, are logic or protocol problems, such as when a system is supposed to transmit a logic 0 but sends a logic 1, or when the logic is in conflict with a protocol.
with regards

[varinder singhParticipant]

hiiiiiiiii..jyoti,
i got ur problem……..A perfect eye diagram contains an immense amount of parametric information about a signal, like the effects deriving from physics, irrespective of how infrequently these effects occur. If a logic 1 is so distorted that the receiver at the far end can misjudge it for logic 0, you will easily discern this from an eye diagram. What you will not be able to detect, however, are logic or protocol problems, such as when a system is supposed to transmit a logic 0 but sends a logic 1, or when the logic is in conflict with a protocol.
with regards

[varinder singhParticipant]

i hope you are able to find the solution of your problem…
thanks with regards