Subject Parameter Definition of DPSK Demodulator
Date 08/07/2009

Parameter Definition


Wavelength Range is defined as spectral range over which the DPSK demodulator can operate.

1528.77 ~ 1563.86 nm

DPSK is acronym for Differential Phase-Shift Keying


DLI is acronym for Delay Line Interferometer.


DQPSK is acronym for Differential Quaternary Phase-Shift Keying


DPSK Demodulator is a component that converts phase modulation into amplitude modulation.


Insertion Loss (dB) is the relative peak power level transmitted to the output ports referenced to the 0-dB reference level when the DPSK demodulator is inserted. "On" and "Off" ports are reported separately.

1.7 dB

Insertion Loss Uniformity (dB) is defined as maximum insertion loss difference between the adjacent channels of the two output ports across the whole operating wavelength range.

0.5 dB

Isolation/Extinction Ratio (dB) is defined as the power difference between peak and valley of the spectrum. "On" and "Off" ports are reported separately.

18 dB

Polarization Dependent Loss (PDL) (dB) is the power difference between the two extreme polarization states. "On" and "Off" ports are reported separately.

0.2 dB

Polarization Dependent Frequency Shift (PDFS) (deg) is the maximum frequency difference measured at the valley of power spectrum among all polarization states.

3 deg

Optical Return Loss (dB) is the ratio between the input power and the reflected power over all polarization states at each port , RL = -10×log10(Pr/Pin).

40 dB

Tuning Range (TR) (GHz) is the maximum shift variation of a center frequency of the spectrum driven by applying control voltage to DPSK demodulator.


Tuning Speed (TS) (second) is the time needed by the device to tune the frequency to its half of target position.

1 s

Operating Temperature (°C) is the ambient temperature range over which the device's performance spec can be met.

-5 to 65 °C

Storage Temperature (°C) is the ambient temperature range over which the device can be stored without affecting its intended application afterwards.

-40 to 85 °C

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