Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

How to compare RF-LO dBc/Hz values with my optical LO

Status
Not open for further replies.
S

sunshineshuvo

Newbie level 4
Joined
Nov 5, 2010
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,326
i have a RF-LO specification
-50dBc/Hz @ 1KHz
-70dBc/Hz @ 10KHz
-90dBc/Hz @ 100KHz
-110dBc/Hz @1MHz

now i like to compare this with an optically generated LO whose PSD is

S(f)=(2*A/pi)*(w/(4*(f-f0)^2+w^2))
where, A=is the amplitude;
f0=carrier frequency;
w=LO linewidth;
i have calculated the LO power (carrier) and plot this PSD of the phase noise S(f) as dBc/Hz.
Then varies the w to know on which linewidth (FWHM) of the beat signal it fits to the RF-LO and it comes as 30Hz. This means the laser linewidth (FWHM) is 15 Hz.

what i am doing wrong? can anyone plz help?

thanks a lot
Reza
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top