SHF Communication Technologies AGWilhelm-von-Siemens-Str. 23D • 12277 Berlin • Germany
Phone ++49 30 / 772 05 10 • Fax ++49 30 / 753 10 78
E-Mail: sales@shf.de • Web: http://www.shf.deDatasheet
SHF 47215C28 Gbps Optical DPSK Receiverwith complementary limiting output

SHF reserves the right to change specifications and design without notice – SHF 47215C V001 - 2/Nov/09

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Description
Differential phase-shift keying (DPSK) is a well-known coding method which is of current interest in thetransmission of high bit rate signals through optical fibers. Compared to the more conventional amplitudeshift keying (ASK), DPSK offers higher sensitivity and enhanced robustness against the impact of nonlinear effects in DWDM transmission.
The SHF 47215C optical 28 Gbps 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 plugin module which needs to be installed in a mainframe type SHF 10001A or SHF 10000B. Together withother plug-in modules from this instrument series, a modular and scalable measurement system can be
implemented. In conjunction with the 28 GSymbol/s (56 Gbps) DQPSK transmitter (SHF 46213B), opticalD(Q)PSK transmission system studies can be performed very efficiently.
The module is controlled over a standard Ethernet connection by an external computer. An easy to use
software package provides not only a user friendly interface for changing the operating parameters but
also the capabilities of feature enhancement through future 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 in thismode, the instrument automatically monitors the output signal and compensates for any changes in thewavelength of the laser light. This feature is a powerful tool for long term measurements.
The output of the balanced detector drives a limiting amplifier which limits the signals amplitude at thecomplementary outputs to, or less than 1 Vpp.

Features
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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)
Decodes NRZ, RZ and CS-RZ DPSK signals
High sensitivity
Limiting complementary outputs

Functional block diagramµC controlled
phase adjust

Optical input

Data inverted out
Data out
DPSK MZInterferometer

SHF reserves the right to change specifications and design without notice – SHF 47215C V001 - 2/Nov/09

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Specifications – SHF 47215 C
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

FSR2Phase tuning response

second21026

mean power

2.2
30

One fixed data rate
per decoder. User
to specify.

fiber heater
operation only

Balanced detector
Electro-optic bandwidth

GHzDetector responsivity

A/W

Detector responsivity
matching%

Common-mode rejection

dBPDL

0.5

35

broad band
operation0.6at DC

101212Up to 20 GHz
20 to 50 GHz
0.40.8

SHF reserves the right to change specifications and design without notice – SHF 47215C V001 - 2/Nov/09

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Parameter

UnitMin.

Typ.

Max.

Conditions

Output signal
50 ΩConnector typeruggedized 1.85mm (V-compatible)
male connectors

Electrical output return loss

dB

-10

Positive and negative pulse
amplitude matching%

20

Positive and negative pulse
delay matching

ps4

Output pulse amplitude

mV

Output pulse zero crossingmV

0

Receiver sensitivity

dBm

600

800

worst case

1000

+6 dBm mean
optical input power-4-3

measured with
SHF 11110B @-9BER = 10

Typ.

Max.

Conditions

Absolute maximum ratings
Parameter
Optical input power into
receiver

Unit

Min.

dBm13CWGeneral
Parameter

Unit

Min.

Typ.

Max.

Weightkg

Operating temperature°C

1035

Storage temperature°C

-20

70

Conditions

2.5

SHF reserves the right to change specifications and design without notice – SHF 47215C V001 - 2/Nov/09

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