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 46214 D
Optical DQPSK Transmitter
100 GBit/s

SHF reserves the right to change specifications and design without notice – SHF 46214D V001 – 26/Sept/2013

Page 1/5

Description
The SHF 46214 D is an optical DQPSK transmitter unit. It is a field replaceable plug-in module whichneeds to be installed in a mainframe type SHF 10001 B or SHF 10000 C. 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 amplified and shaped by a set of 60 GHz drivers. These signals
are fed to thermally stable Lithium Niobate Mach-Zehnder modulator which includes a nested MZIstructure. Before superposition of the two light streams inside the nested MZI, the Q part gets /2 shiftedin order to have four different phase states in the transmitted signal.
The SHF 46214 D does not require a clock 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 A is the ideal instrument. It is possible to switch between the I and the Q channel for eye analysis
or BER measurement of both channels separately.
For a BER measurement the SHF 12103 A or 12104 A Bit Pattern Generator provides the Data and Datainverted 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Up to 108 Gbps (54 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 46214D V001 – 26/Sept/2013

Page 2/5

Functional block diagramuC Control

Data modulator
MZ
MZ

60 GHz shaping drivers

CW Light inAB

Modulated
Light out

Data inSpecifications – SHF 46214 DParameter

Unit

Min.

Typ.

Max.

Comment

Optical parametersWavelength range

C- and L-band

Insertion lossdB

8DC Extinction ratiodB

20

Return loss

dB30

10connector to connector,
maximum transmission
without modulation

without optical connector

Electrical and electro-optical parameters-3dB electricalElectro-optical bandwidth ofData modulator

GHz

25

Symbol rate
Electrical input return loss

Gsym/sdB554-10

Vpp

0.3

0.8

Electrical input level
Dynamic signal to noise ratio
DPSK-mode, either Data A or B

1012

measured withSHF 47214A
DPSK-receiver@ 50 Gbps.

SHF reserves the right to change specifications and design without notice – SHF 46214D V001 – 26/Sept/2013

Page 3/5

Absolute maximum ratings
Parameter

Unit

Min.

Typ.

Max.

Optical input power

dBm

16

Electrical data input powerdBm

4Conditions
NRZ data

General specifications
Parameter

Unit

Min.

Typ.

Weightkg

3.3

Dimensions

mm

59x213x450

Power consumption

W

20.5

Operating temperature°C

101Conditions
w/o Frontpanel Connectors

35

Electrical data input connectors
Optical connectors

Max.

male K (2.92mm)
FC/PC

FC/PC

1

Other connectors available on request

SHF reserves the right to change specifications and design without notice – SHF 46214D V001 – 26/Sept/2013

Page 4/5

Test Measurements
The following equipment was used in obtaining these results:
31SHF12100 B 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: 11S/N: 12Both Data A and Data B channel switched ON(DQPSK), 50 GSymbols/s

S/N: 10
Constellation:

EVM: 9.8

SHF reserves the right to change specifications and design without notice – SHF 46214D V001 – 26/Sept/2013

Page 5/5