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 47214A
50 Gbps Optical DPSK ReceiverDescription
The SHF 47214A 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 10001B 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 sensitivity

Functional Block Diagram

SHF reserves the right to change specifications and design without notice - SHF 47214A, V001, 21/June/2010

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Specifications
ParameterUnitMin.

Typ.

Max.

Conditions

Decoder
Optical Connector Type

FC/PC, other types
on request

Operating wavelength

nm

1520

1620

Optical input power into
receiverdBm

Optical return lossdB

25

Decoder Excess opticalloss

dB

1.6

Data rate

Gb/s

Decoder phase tuningrange

FSR

2

Phase tuning response

second21048

mean power

2.255

One fixed data rate
per decoder. Userto specify.

fiber heater
operation only

Balanced detector
Electro-optic bandwidth

GHzDetector responsivity

0.5

Detector responsivity
matching%

Common-mode rejectiondBPDL45

broad band
operation0.6

at DC

101212Up to 20 GHz
20 to 50 GHz
0.4

0.8

Output signal
50 ΩConnector typeruggedized 1.85
mm (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 47214A, V001, 21/June/2010

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ParameterUnit

Output pulse amplitude

mVOutput pulse width(FWHM)
RZ
CS-RZ

psOutput pulse zero crossing

mVMin.

Typ.

Max.

180

Conditions+10 dBm mean
optical input power

10150

Absolute maximum ratings
Optical input power intoreceiverdBm

13CWGeneral
Weightkg

2.5

Operating temperature°C

1035

Storage temperature°C-2070

Eye diagram

50 Gbps output signal. S/N: 17.9; RMS Jitter: 988 fs

SHF reserves the right to change specifications and design without notice - SHF 47214A, V001, 21/June/2010

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