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40Gb/s DPSK Receivers  
 
     
40Gb/s DPSK Reviever PDF Datasheet
 
  • Description
  • Features
  • Applications
  • Specification
Product Description - 40Gb/s Integrated DPSK Receivers

Targeting for the next-generation 40Gb/s system based on advanced optical differential phase shift keying (DPSK) demodulation, Optoplex’s 40Gb/s Integrated DPSK Receiver (DPSK Rx) demodulates an incoming DPSK optical signal into a pair of differentially (amplitude) modulated RF outputs at data rate up to 43Gb/s in a compact package.
Phase modulated optical signals offer much better dispersion performance compared with traditional amplitude modulated counterparts because the carrier light stays on all the time so that the intensity-dependent nonlinear effects in the transmission link are avoided, resulting in longer transmission distances.

The integrated DPSK receiver combines a delay-line interferometer (DLI) with a balanced receiver to achieve compact size in a butterfly package. Compared with discrete components, the integrated receiver couples optical outputs from the DLI directly into the balanced photodetectors, resulting in smaller insertion loss and low channel skew, in addition to the elimination of fiber routing and matching.
The DLI demodulator is based on Optoplex’s proprietary, patent-pending free-space micro-optics, through which the incoming phase modulated optical signal is converted into a pair of differential, amplitude-modulated optical signal for detection by the balanced photodetectors. Due to its unique materials and design, the DLI exhibits highly athermal behavior in terms of insertion loss and phase error. The RF outputs from the balanced photodetectors are further amplified by a limiting TIA. As optional features, monitoring input tap with PD and/or 3dB attenuation (on one arm) can also be incorporated into the package.
Optoplex’s 40Gb/s Integrated DPSK Receivers can be configured at different FSR such as 43GHz, 50GHz, 57GHz or other customer specified values. A colorless version with the spectrum peaks aligned to the ITU grid is also available.

Features and Benefits of 40Gb/s Integrated DPSK Receivers
  • Compact size
  • Low insertion loss
  • Low phase error
  • <1 ps skew
  • Customizable FSR
Applications
  • 40G DPSK Transponder
40Gb/s Integrated DPSK Receiver Product Datasheet

 
Standard Specifications of DPSK Demodulator
Parameter
Unit
Specification1

Wavelength Range (C-band)

nm

1520 -1570

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

Notes:

  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

Example

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.

1.5×FSR

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