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40Gb/s DPSK Receiver
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Home > Products > Integrated High-Speed Receivers > 40Gb/s Integrated DQPSK Receivers
40Gb/s DQPSK Receiver  
Optoplex 40Gbps DQPSK Reveiver
Optoplex 40Gbps DQPSK Reveiver
40Gb/s DQPSK Receiver PDF Datasheet
  • Description
  • Features
  • Applications
  • Specification
Product Description - 40Gb/s DQPSK Receiver

The integrated DQPSK receiver incorporates an optical phase demodulator (delay-line interferometer or DLI) with 2 pairs of balanced photo-diodes and 2 linear TIAs into a single butterfly package. Compared with the currently available discrete solution in which a separate DLI and a separate receiver are used, the integrated DQPSK receiver eliminates labor intensive fiber routing and coupling (between the DLI and the balanced receiver) as well as the skew control. Moreover, the integrated DQPSK receiver offers a smaller footprint suitable for today’s demanding high speed transponder applications.

The optical phase demodulator is based on Optoplex’s proprietary technology with high tuning speed (up to ms range) to achieve superior optical and thermal performance. Free space optical alignment is employed to couple the optical outputs from the DLI directly into the waveguide-based balanced photodiodes.

Differential TIAs with bandwidth control, AGC, MGC and PLD are used in the integrated receiver. The high speed interface (RF output) is CPW-SMT with pin dimensions compatible with OIF2009.033.05 IA for 100-Gb/s coherent receiver.

The FSR of the DQPSK receivers can be customer specific, such as 21.5, 21.9, 25, or 28GHz, etc. A colorless version with the spectrum peaks aligned to 25-GHz ITU grid is also available upon request.


Features and Benefits of 40Gb/s DQPSK Receiver
  • Fast tuning speed
  • Low PDPS and TDFS
  • High extinction ratio
  • Small skew
  • High bandwidth
  • Built-in AGC/MGC and PLD
  • Small footprint
  • CPW-SMT output interface
  • Low power consumption
  • 40G DQPSK Transponder
  • 100G DP-DQPSK transponder
  • DQPSK demodulation
40Gb/s DQPSK Receiver Product Datasheet


Standard Specifications of DQPSK Receiver




Wavelength Range (C-band) nm
Free Spectral Range (typical)2 GHz 21.5, 25, 33.3, 43, 50, 57, 65, 66.7
Temperature Dependent Frequency Shift GHz < 10
Extinction Ratio dB > 16
Skew ps < 1.0
Phase Tuning Range FSR > 1.5
Polarization Dependent Phase Shift deg < 5
Differential Conversion Gain V/W > 1500
Differential Output Eye Amplitude mVpp 550
DC Responsivity  @ Optimum DLI Phase A/W > 0.2
Optical Input Power dBm -6 to +8
Polarization Dependent Loss dB < 0.6
Optical Return Loss dB > 27
Bit Rate (NRZ-DPSK) Gbps 43
O-E Bandwidth (S21 3dB Cut-off Frequency) GHz > 28
Photodiode Dark Current (per PD) nA  < 100
Electrical Return Loss (S22) dB -10 (DC-20GHz)
-4 (20-45GHz)
Amplifier Supply Voltage V -5.2
Power Consumption W < 1.5
Phase Tuning Speed s < 1
OSNR Performance dB 20
Package Dimensions (excluding collimator sleeves and electrical pins) mm 50 x 30 x 7.5


  1. Over the stated spectral and operating temperature ranges and all polarization states.
  2. Other FSR available upon request.
Typical Performance of DPSK Demodulator

Parameter Definition of DPSK Demodulator

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

Product Request and Ordering Information
Please speak to Optoplex Sales persons. If you request custom-designed DPSK Rx product, please provide the following parameters:
  • Wavelength range
  • Fiber length
  • Optical connector type