SHF Communication Technologies AGWilhelm-von-Siemens-Str. 23 • Aufgang D • 12277 Berlin • Germany
Phone ++49 30 / 772 05 10 • Fax ++49 30 / 753 10 78
E-Mail: mail@shf.de • Web: http://www.shf.deDatasheet
SHF 47210A40 Gbps Optical DPSK ReceiverDescription
The SHF 47210A optical DPSK receiver offers a solution for demodulation of DPSK-encoded
optical signals and conversion back into electrical signals for further analysis. It is a field
replaceable plug-in module which needs to be installed in a mainframe type SHF 10001A or SHF
10000A. Together with other plug-in modules from this instruments series, a modular and scalable
measurement system can be put together. In conjunction with the multiformat optical DPSKtransmitter SHF 46210A optical transmitter, tests for optical DSPK transmission can be performed
very efficiently.
The mainframe with the installed modules is controlled over a standard Ethernet connection by an
external computer which is a standard part of the package. An easy to use software package
provides not only a user friendly interface for changing the operating parameters but also thecapabilities of feature enhancement through firmware & software upgrades
To assist the customer in performing efficient measurements and to make the instrument robust
against variations of the wavelength of the input signal, a tracking mode is implemented. When
operating the instrument in this mode, the instrument automatically monitors the output signal andcompensates for any changes in the wavelength of the laser light. This feature is a powerful tool
for long term measurements.
Differential phase-shift keying (DPSK) is a well-known coding method which is of current interestin the transmission of high bit rate signals through optical fibers. Compared to the moreconventional amplitude-shift keying (ASK), DPSK offers higher sensitivity and enhanced
robustness against the impact of non-linear effects in DWDM transmission.

Features
Scalable and modular system
Windows Style Bert Control Center software package
Computer controlled operation over the Ethernet which also enables remote access.
Feature enhancement through firmware & software upgrades
User-specified bit rate (narrowband operation)
Ruggedized 1.85 mm male connector for electrical data output
Decodes NRZ, RZ and CS-RZ DPSK signals
High sensitivityFunctional Block Diagram

SHF reserves the right to change specifications and design without notice - SHF 47210A, V002, 5/Apr/06

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Specifications
Parameter

UnitMin.

Typ.

Max.

Conditions

Decoder
Optical Connector Type

FC/PC, other types
on request

Operating wavelength

nm

1520

1620

Optical input power intoreceiverdBm

Optical return loss

dB25

Decoder Excess opticalloss

dB

1.6

Data rate

Gb/s

Decoder phase tuningrange

FSR

2

Phase tuning response

second2

1039.8

mean power

2.2
43

One fixed data rate
per decoder. Userto specify.

fiber heater
operation only

Balanced detector
Electro-optic bandwidthGHzDetector responsivity

0.5

Detector responsivity
matching%

Common-mode rejection

dBPDL

45

broad bandoperation0.6

at DC101212Up to 20 GHz
20 to 50 GHz
0.40.8Output signal
Connector type50 Ωruggedized 1.85mm (V-compatible)
male connector

Electrical output return loss

dB-10

Positive and negative pulse
amplitude matching%

20

Positive and negative pulse
delay matching

ps3

worst case

SHF reserves the right to change specifications and design without notice - SHF 47210A, V002, 5/Apr/06

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ParameterUnitMin.

Typ.

Output pulse amplitude

mV

Output pulse width(FWHM)
RZ
CS-RZ

psOutput pulse zero crossing

mV

0Receiver sensitivity

dBm-34Max.

200Conditions+10 dBm mean
optical input power1015

SHF 5003 DPSK
as transmitter.
See reference
measurement setup

Absolute maximum ratings
Optical input power into
receiver

dBm

13CW

GeneralWeightkg

2.5

Operating temperature°C

1035

Storage temperature°C

-20

70

SHF reserves the right to change specifications and design without notice - SHF 47210A, V002, 5/Apr/06

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Test Measurements
DFB Laser

optical attenuator

RZ-DPSKtap coupler

Tx

Opt.out

15mW

optical amplifiers

OBPF

Clock in Data in

Clock

Opt. inPowermeter

Data

DPSK Receiver
Elec. out

40Gbps BPG
Clock

Measurement
setup
Measurement
setup

Data

40Gbps EA

1e-02

1e-03

Bit error rate

1e-04

Biterror
rate

1e-05
1e-06
1e-07
1e-08
1e-09
1e-11
1e-13
1e-15
-46

-44

-42

-40

-38

-36

-34

-32

Optical power (dBm)

Two measurements made under different conditions. Magenta (left): 40 Gbps with a 70 GHz opticalbandpass filter and a preamp with 4dB noise figure. ~45 photons/bit Blue (right): 42.4 Gbps with a
1.2nm optical bandpass filter and a preamp with 5.5dB noise figure. ~71 photons/bit. Sensitivity limit:
20 photons/bit

SHF reserves the right to change specifications and design without notice - SHF 47210A, V002, 5/Apr/06

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Eye diagrams

42.6 Gbps NRZ optical output signal. S/N: 11.3; RMS Jitter: 1.13 ps

42.6 Gbps RZ optical output signal. S/N: 13.2; RMS Jitter: 924 fs

42.6 Gbps CS-RZ optical output signal. S/N: 12.2; RMS Jitter: 1.19 ps

SHF reserves the right to change specifications and design without notice - SHF 47210A, V002, 5/Apr/06

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