I want to use a highly coherent and tunable laser source for gyro application. Out of fiber laser and diode laser which one will be better?
So, other than being highly coherent you don't have any other requirements to specs of the source (i.e., thermal stability, tunability range, maintaining stability against mechanical impacts, polarization properties, modal structure, ease of coupling& efficiency, power requirements, foot-print, cost...)?
tunability range should be 1525 to 1575 nm, output should be single mode, linearly polarized and thermally stabilized, power can be in the range of 10 mW, efficiency about 70%
as for the ease of coupling, I was thinking that fiber laser will be better than diode laser since I have to couple the output directly to fiber.
Cost factor I am unaware of.
I would recommend dbr laser diode for this, "fiber" lasers are actually loops of fiber excited by pump laser diodes. most laser diodes at 1550 nm are fiber coupled and ready to connect to transmission fiber etc. I dont recall tunability being that important for gyro applications, phase noise is the critical factor. you will need a phase modulator also if you are building a fiber gyro.
What about efficiency? As far as I know fiber lasers are more efficient than DBR or DFB lasers and their driver circuitry is also very cheap.
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