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 46215A
Optical DP-QPSK Transmitter

SHF reserves the right to change specifications and design without notice – SHF 46215A V001 – 8/Oct/2010

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Description
The SHF 46215A is an optical transmitter unit featuring Quadrature Phase Shift Keying modulation format
in two orthogonal Polarization planes, (DP-QPSK). It is a field replaceable plug-in module which needs tobe installed in a mainframe type SHF 10001B or SHF 10000A. Together with other plug-in modules fromthis instruments series, a modular and scalable measurement system can be put together.
In a single polarization DQPSK (Differential Quadrature Phase Shift Keying) transmission system, thedata is transmitted in the differential optical phase change between the symbols. The data is encoded infour different phase states. 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 highspectral efficiency. In a DP-QPSK transmission system the capacity is doubled by transmitting the data in
two orthogonal polarization planes.
The SHF 46215A uses two modulators (one modulator per polarization plane) integrated in parallel, andconverting four electrical data streams (I and Q in X- and Y-polarization) of up to 32 Gbps into 1 optical
data stream of up to 32 GSymbols/s, and hence a total capacity of up to 128 Gbps. The output optical
data in the two orthogonal polarization planes are bit-synchronized in time.
The 4 data channels can be switched On and Off independently, thus permitting to generate either DPSKor DQPSK signals in single- or dual polarisation mode. Therefore, the instrument has a dual-use featurefor either DP-BPSK or DP-QPSK for a variety of coherent transmission system investigations.
The DC biases of the MZ modulators are controlled automatically as other SHF optical transmitter
instruments, to ensure stability for long term measurements.
An optical pulse carver is available as an option.
To detect and to demodulate the phase information of either the I or the Q channel per polarisation into
intensity/amplitude, the 32 Gbps DPSK optical receiver SHF 47215 in combination with a PM-splitter isthe ideal instrument. It is possible to switch between the I and the Q channel for eye analysis or BER
measurement of both channels separately.
If BER measurements at 32 Gbps are desired, the SHF Bit Pattern Generators (SHF 12103) can provide
the pre-coded I and Q data stream pairs.

Features•4 x 32 Gbps optical data streams•

All modulators’ bias conditions controlled automatically•

Selectable automatic and manual bias control (ABC circuit)•Operation under DP-BPSK or DP-QPSK mode possible•

All features are computer controlled via BCC software•Optional pulse carver for RZ operation

SHF reserves the right to change specifications and design without notice – SHF 46215A V001 – 8/Oct/2010

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Functional block diagramuC Control

DP-QPSK Data modulator
ϕ

MZ
MZ

ϕ

MZ

90°
Pol.rot.

MZ
Data drivers

CW Light in

IX QX IY QY
Data inModulated
Light out

Specifications – SHF 46215A
Parameter

UnitMin.

Typ.

Max.

Comment

Optical parameters
Wavelength range

C- and L-band1416connector to connector,
maximum transmission
without modulation,option No RZ

Insertion loss
(for each polarization)dB

DC Extinction ratio

dB20

Return loss

dB30

without optical connector

23-3dB electricalElectrical and electro-optical parameters
Electro-optical bandwidth ofData modulator
Symbol rate
DP-QPSK
Drive amplifier electrical return loss
Data
Drive amplifier input level
Data input
Dynamic signal to noise ratio
DPSK-mode,
either Data IX, QX, IY or QY

GHzGsym/s

533

dB-10
Vpp
0.5
90.911

measured withSHF 47215
DPSK-receiver.
@ 28 Gbps

SHF reserves the right to change specifications and design without notice – SHF 46215A V001 – 8/Oct/2010

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Absolute maximum ratings
Parameter

Unit

Min.

Typ.

Max.

Optical input power

dBm

18

NRZ data amplifier input powerdBm

4Conditions
NRZ data

General specifications
Parameter

Min.

Typ.

Weightkg

3.3

Dimensions

mm

59x213x450

Power consumption

W

20.5

Operating temperature°C

Electrical data input connectors
Optical connectors

1Unit

10Max.

Conditions
w/o Front panel Connectors

35male K (2.92mm)
FC/PC

1

Other connectors available on request.

SHF reserves the right to change specifications and design without notice – SHF 46215A V001 – 8/Oct/2010

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Direct Detection Performance Results
The following equipment was used in obtaining these results:
31SHF12103 A Pattern Generator at 28 Gbps, PRBS 2 -1
SHF 1550DFB Laser source set to 15mW output power @ 1550 nm.
AMPAQ EDFA + band pass filter.
Agilent 86100A DCA with 70GHz plug-in and precision time base module.
D(Q)PSK signals detected with SHF 47215 28 GBit/s DPSK receiver.
Only IX channel On(DPSK in X-pol)

Only IY channel On(DPSK in Y-pol)

Only QX channel On(DPSK in X-pol)

Only QY channel On(DPSK in Y-pol)

S/N: 13

S/N: 10

S/N: 12

S/N: 10

Both IX and QX On(QPSK in X-pol)Both IY and QY On(QPSK in Y-pol)

S/N: 8

S/N: 9

SHF reserves the right to change specifications and design without notice – SHF 46215A V001 – 8/Oct/2010

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Coherent Detection Characteristics
Figure below shows the dual polarization feature of the transmitter output signal captured by using acommercial high speed coherent constellation analyzer, the EXFO PSO-200, and the corresponding time
domain characteristics of the signal. A narrow line width laser source was used at the input. The four 32Gbps input data channels were provided by using the SHF 12103A Quad-32 bit pattern generator.

Courtesy EXFO.com

SHF reserves the right to change specifications and design without notice – SHF 46215A V001 – 8/Oct/2010

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