SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23 • Aufgang D • 12277 Berlin – Marienfelde • Germany
Phone ++49 30 / 772 05 10 • Fax ++49 30 / 753 10 78
E-Mail: sales@shf.biz • Web: http://www.shf.biz

Datasheet
SHF 5003 DPSK
Optical TransmitterDescription
The SHF 5003 DPSK Optical Transmitter converts electrical signals into optical signals at a data
rate of up to 50 Gbps. It is able to encode the data in ASK (amplitude shift keying) and DPSK(differential phase shift keying) formats. With NRZ, Conventional RZ and Carrier Suppressed RZ,a total of six formats are supported. When used in DPSK mode, the SHF 5008 DPSK Optical
Receiver is an ideal instrument for decoding the signal.
ASK is the more familiar method used in optical communications. The light intensity is varied sothat light on corresponds to "1" and light off corresponds to "0", or vice versa. DPSK is a wellknown coding method which has recently received interest in the transmission of high bit rate
signals through optical fibers. Data is encoded by changing the phase of the light. Compared tothe more conventional ASK, DPSK offers higher sensitivity and enhanced robustness against theimpact of non-linear effects in DWDM transmission.
The main elements of the SHF 5003 DPSK are two thermally stable Avanex OTI X-cut Lithium
Niobate Mach-Zehnder modulators which are each driven by an individually optimized amplifier.
For the RZ modes, an amplifier amplifies a clock signal which is used to drive the first modulator.
The output from this modulator is a train of pulses of constant width. These pulses are fed into thesecond modulator. The pulsed light is then modulated by the data signal. In this way, RZ signals
are produced from an incoming NRZ signal. For the NRZ modes, the first modulator is biased toallow light through continuously.
The temperature stable modulators and an automatic bias circuit ensure high stability of the outputsignal. All features on the instrument can be controlled remotely via a GPIB connection.

Features
50Gbps optical data streams< 9 ps rise and fall time digital optical signals at 44 GBit/s
50 kHz to >40 GHz E/O conversion bandwidth (typical)
Quick optimization of optical eye diagram performance by user adjustable gain and modulator
bias control
GPIB connector for remote control
All features computer controlled
Both modulators’ bias conditions controlled automatically
Selectable automatic and manual bias control (ABC circuit)
SONET/SDH compatible
Front panel selection of NRZ, RZ or CS-RZ in ASK and DPSK formats

Functional block diagram

SHF 5003 DPSK

Rev. 2.2 – 15/MAR/2004

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SHF reserves the right to change specifications and design without noticeSpecifications – SHF 5003 DPSKParameter
Optical parameters
Wavelength range
Insertion lossUnit

DC Extinction ratiodB40Return loss
Chirp (Alpha parameter)
Positive slope
Negative slope

dB50

Typ.

0.03
-0.01

ASK-Mode operation
Drive amplifier input level
Data input
RZ clock input
Dynamic extinction ratio
NRZRZ
CS-RZ
Dynamic signal to noise ratio
NRZ
RZ
CS-RZ
Output rise and fall times
NRZ
Pulse width (FWHM)
RZ
CS-RZ
Output timing jitter <RMS>
NRZ
RZ
CS-RZ
Position of crossing point @ NRZ
DPSK mode operation
Drive amplifier input level
Data
Clock pulse RZ
Phase modulation by 2 Vπ drive

kHzMax.

C- and L-band
1011dB

Electrical and electro-optical parameters
Electro-optical bandwidth ofGHz
Data modulator
Bit rateGbps
RZ
Data
Drive amplifier electrical return lossdB
Data
Clock pulse RZ

Auto-bias control (ABC)
Dither signal frequency

Min.

0.1-0.1

connector to connector,
maximum transmission
without modulation
measured on cascaded
devicewithout optical connector
small signal measurement1
method-3dB electrical

30362

Conditions

4450-10-10Vpp(dBm) 0.35 (-5) 0.45 (-3)
0.5 (-2) 0.6 (0)dB
1113121412140.6 (0)1.2 (6)
measured between data
‘1’ and long sequence of‘0’151816ps
910ps
1215
ps%Vpp(dBm)
Rad

1.0
0.4
0.450

1.2
0.5
0.555

0.6 (0)1.0 (4)
1.2 (6)π45

0.6 (0)0.5 (-2)
020%…80% as displayedon oscilloscopemeasured with 70 GHz
detector and 70 GHz
sampling scope
total RMS jitter measured
with Agilent Mainframe
86100A + 70 GHz plug in
86118A + precision
timebase 86107A

101(F. Devaux, Y. Sorel and J.F. Kerdiles, "Simple Measurement of Fiber Dispersion and of Chirp Parameter of Intensity Modulated
Light Emitter", J. Lightwave Technol., vol. 11, no. 12, December 1993)

SHF 5003 DPSK

Rev. 2.2 – 15/MAR/2004

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SHF reserves the right to change specifications and design without noticeAbsolute maximum ratings
Parameter
Optical input power
NRZ data amplifier input
power
RZ clock driver input power

Unit
dBm
dBm

Min.

Typ.

dBm

Max.
20
10Conditions
CW
NRZ data

10CW

General specifications
Parameter
WeightDimensions
Power supply

Unitkgmm
VPower consumption
Operating temperature
Electrical data input
connector
Clock input connector
Optical connectors

W°CMin.

Typ.
9Max.

90
1801102306013527010Note472x365x110
47…63 Hz35V (1.85mm)
K (2.9mm)
FC/PC

Test Measurements
The following equipment was used in obtaining these results:
BPG 4E S/N 4662 Pattern Generator
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
ASK signals detected with 70 GHz photodetector; DPSK signals detected with SHF 5008 DPSK
Typical transmitter data input signal

42.6 Gbps electrical signal. S/N: 14.8; RMS Jitter: 355 fs

SHF 5003 DPSK

Rev. 2.2 – 15/MAR/2004

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SHF reserves the right to change specifications and design without noticeTransmitter in ASK-mode

42.6 Gbps NRZ optical output signal. S/N: 20.0; RMS Jitter: 727 fs

42.6 Gbps RZ optical output signal. S/N: 25.7; RMS Jitter: 237 fs

42.6 Gbps CS-RZ optical output signal. S/N: 22.3; RMS Jitter: 334 fs

SHF 5003 DPSK

Rev. 2.2 – 15/MAR/2004

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SHF reserves the right to change specifications and design without noticeTransmitter in DPSK modeoptical attenuator
DFB Laser

RZ-DPSKtap coupler

Tx

Opt.out

15mW

optical amplifiers

OBPF

Clock in Data in

Clock

Opt. inPowermeter

Data

DPSK Receiver
Elec. out

40Gbps BPG
ClockData

40Gbps EA

Measurement setup

Receiver sensitivity

1e-02

1e-03

Bit error rate

1e-04

Bit
1e-05
error
rate 1e-06
1e-07
1e-08
1e-09
1e-11
1e-13
1e-15
-46

-44

-42-40-38-36-34-32

Optical power (dBm)

Two measurements made under different conditions.
Magenta (left): 40 Gbps with a 70 GHz optical bandpass filter and a preamp with 4dB noise figure.
~45 photons/bit
Blue (right): 42.4 Gbps with a 1.2nm optical bandpass filter and a preamp with 5.5dB noise figure.
~71 photons/bit
Sensitivity limit: 20 photons/bit

SHF 5003 DPSK

Rev. 2.2 – 15/MAR/2004

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SHF reserves the right to change specifications and design without noticeEye diagrams

42.6 Gbps NRZ optical output signal. S/N: 11.3; RMS Jitter: 1.13 ps

42.6 Gbps RZ optical output signal. S/N: 13.2; RMS Jitter: 924 fs

42.6 Gbps CS-RZ optical output signal. S/N: 12.2; RMS Jitter: 1.19 ps

SHF 5003 DPSK

Rev. 2.2 – 15/MAR/2004

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SHF reserves the right to change specifications and design without notice