Mint 300 Manual do Utilizador descarregar pdf (Página 10)

MINT and WT

MINT: Delay Line Interferometers

www.kylia.com

MINT & WTMINT

8 – Phase tuning options

For DPSK demodulation, the phase tuning is essential in order to control the contrast between both outputs

of the interferometer/demodulator.

The FSR variation is not significant (and can be considered as invariant) when the user adjust the phase of

the demodulator/interferometer.

KYLIA proposes for all its DPSK demodulators (MINT and WT-MINT) two different phase tuning options:

U option: Ultra-fast response based on a piezo actuator.

This option is helpful for fast shifting systems (instability of the laser for instance). The DLI

can adapt itself instantaneously to the environment, if a closed loop between BER and phase

shifting is set up. This solution is mainly used in labs.

IL (dB)

Frequency (GHz)

FSR

input signal

frequency (=c/λ)

Using the pha

se tuning, the

user can adjust the

demodulator phase in

order to match with the

input signal frequency

DPSK demodulator

output 1

DPSK demodulator

output 2

low contrast between outputs

high contrast between outputs thanks to phase tunin

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Mint 300 Manual do Utilizador Página 10