SHF Communication Technologies AG
Wilhelm-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 46214C
Optical DQPSK Transmitter
100 GBit/s

SHF reserves the right to change specifications and design without notice – SHF 46214C V002 – 25/May/2011

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Description
The SHF 46214C is an optical DQPSK transmitter unit. It is a field replaceable plug-in module whichneeds to be installed in a mainframe type SHF 10001A or SHF 10000A. Together with other plug-inmodules from this instruments series, a modular and scalable measurement system can be put together.
In a DQPSK (Differential Quadrature Phase Shift Keying) transmission system, the data is transmitted in
the differential optical phase change between the symbols. The data is encoded in four different phasestates. Since one transmitted symbol includes the information of two bits the symbol rate is reduced by
the factor ½. Therefore one advantage of a DQPSK transmission system is a high spectral efficiency.
The 2 electrical input data streams are retimed and reshaped by 2 DFFs. The complementary outputs ofthe 2 DFFs drive a set of 4 data amplifiers. These signals are fed to thermally stable Lithium Niobate
Mach-Zehnder modulator which includes a nested MZI-structure. Before superposition of the two lightstreams inside the nested MZI, the Q part gets π/2 shifted in order to have four different phase states inthe transmitted signal.

The 2 data channels can be switched On and Off independently, thus permitting to generate either DPSKor DQPSK signals.
To detect and to demodulate either the I or the Q channel, our 50 Gbps DPSK optical receiver SHF
47214 is the ideal instrument. It is possible to switch between the I and the Q channel for eye analysis orBER measurement of both channels separately.
For a 50 GSymbols/s BER measurement the SHF 12100B Bit Pattern Generator provides the Data andData-inverted outputs for the I and Q data streams.

The temperature stable modulator and an automatic bias circuit for the data channels ensure high stabilityof the output signal.

Features•100 Gbps (50 GSymbol/s) optical data streams•Separate analysis of I and Q channel possible•

Quick optimization of optical eye diagram performance by user adjustable modulator bias control•

All features computer controlled•

All modulators’ bias conditions controlled automatically•

Selectable automatic and manual bias control (ABC circuit)

SHF reserves the right to change specifications and design without notice – SHF 46214C V002 – 25/May/2011

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Functional block diagramuC Control

Data modulatorϕ

MZ
MZ
Data drivers

CW Light in

DFF

DFF

AB

DFF
Clock driver

Modulated
Light out

Clock in

Data inSpecifications – SHF 46214C
ParameterUnitMin.

Typ.

Max.

Comment

Optical parameters
Wavelength range

C- and L-bandInsertion lossdB

8

DC Extinction ratio

dB20

Return loss

dB30

10connector to connector,
maximum transmission
without modulation

without optical connector

Electrical and electro-optical parameters
Electro-optical bandwidth ofData modulator

GHz25

Symbol rate
Electrical input return loss
Data
Clock
Electrical input level
Data input
Clock input
Dynamic signal to noise ratio
DPSK-mode, either Data A or B

Gsym/sdB

5-3dB electrical

52-10-10Vpp
0.30.3100.8
0.812measured withSHF 47214A
DPSK-receiver@ 50 Gbps.

SHF reserves the right to change specifications and design without notice – SHF 46214C V002 – 25/May/2011

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Absolute maximum ratings
Parameter

Unit

Min.

Typ.

Max.

Conditions

Optical input power

dBm

16

Electrical data input powerdBm

4

NRZ data

Electrical clock input power

dBm

4CW

General specifications
Parameter

Min.

Typ.

Weightkg

3.3

Dimensions

mm

59x213x450

Power consumption

W

20.5

Operating temperature°C

10Max.

Conditions
w/o Frontpanel Connectors

35

Electrical data input connectors

male K (2.92mm)

Clock input connector

male V (1.85mm)

Optical connectors

1Unit

FC/PC

FC/PC

1

Other connectors available on request

SHF reserves the right to change specifications and design without notice – SHF 46214C V002 – 25/May/2011

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Test Measurements
The following equipment was used in obtaining these results:
31
SHF12100 A Pattern Generator at 50 Gbps, PRBS 2 -1
SHF 1550DFB Laser source set to 15mW output power @ 1550 nm.
AMPAQ EDFA + bandpass filter
Agilent 86100A DCA with 70GHz plugin and precision timebase module
D(Q)PSK signals detected with SHF 47214A 50 GBit/s DPSK receiver
only Data A switched ON

only Data B switched ON

S/N: 13

S/N: 14

Both Data A and Data B channel switched ON(DQPSK), 50 GSymbols/s

S/N: 8

SHF reserves the right to change specifications and design without notice – SHF 46214C V002 – 25/May/2011

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