How to measure chirp

[muhammad jawad]

Dear friends
hope you all are fine and enjoying the life

i simulated a system for generation of UWB pulses(attached as screen shot) where 2 probe signals and one pump signal interacts in SOA and due to XPM,the output of the SOA is a chirped signal.
I want to know
1)what is chirp in optical signal)
2)how i can quantify the chirp?
3)how can i plot the chirp??(plot between optical signal frequency or wavelength on y axis and time on x-axis)

i will be very grateful and obliged all of you for your kind help
regards
jawad mirza

Attachments:

1. 

   system-layout.png
   

[muhammad jawad]

Dear friends

i am getting such a signal at output of the SOA…is it chirped signal????Rest of the question is as it is at above
regards
jawad

Attachments:

1. 

   chirped-signal.png
   

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