SHF Communication Technologies AG,Wilhelm-von-Siemens-Str. 23 D • 12277 Berlin–Marienfelde • Germany
Phone ++49 30 / 772 05 10 • Fax ++49 30 / 753 10 78
E-Mail: mail@shf.de • Web: http://www.shf.deDatasheet
SHF 46210B
Multi-format Optical TransmitterSHF 46210 B – V001 – 23/Oct/2006

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SHF reserves the right to change specifications and design without noticeDescription
The SHF 46210 B is an optical transmitter unit. This is a half-width plug-in for the SHF 10000 A
mainframe. Field installation or upgrade by the end-user is possible for this equipment.
The SHF 46210 B Optical Transmitter converts electrical signals into optical signals at a data rateof 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 47210 DPSK OpticalReceiver 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 46210 B are two thermally stable Chirp-free Lithium Niobate MachZehnder 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 the secondmodulator. The pulsed light is then modulated by the data signal. In this way, RZ signals areproduced from an incoming NRZ signal. For the NRZ modes, the first modulator is biased to allow
light through continuously.
The temperature stable modulators and an automatic bias circuit ensure high stability of the outputsignal.

Features••••••••50 Gbps optical data streams< 9 ps rise and fall time digital optical signals at 44 Gbps
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
All features computer controlled
Both modulators’ bias conditions controlled automatically
Selectable automatic and manual bias control (ABC circuit)
SONET/SDH compatible

Functional block diagram

SHF 46210 B – V001 – 23/Oct/2006

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SHF reserves the right to change specifications and design without noticeSpecifications – SHF 46210 B
Parameter

UnitMin.

Typ.

Max.

Comment

13connector to connector,
maximum transmission
without modulation

Optical parameters
Wavelength range

C- and L-band

Insertion lossdB

11

DC Extinction ratiodB

20

Return loss

dB30

Chirp (Alpha parameter)
Positive slope
Negative slope

without optical connector

0.2-0.2

small signal measurement1
methodElectrical and electro-optical parameters
Electro-optical bandwidth ofData modulatorGHz

Bit rate
RZ
Data
Drive amplifier electrical return loss
Data
Clock pulse RZ

Gbps-3dB electrical

253664450dB-10-10

ASK-Mode operation (Datarate 36 ... 44 Gbps)
Drive amplifier input level
Data input
RZ clock input
Dynamic extinction ratio
NRZRZ
CS-RZ
Dynamic signal to noise ratio
NRZRZ
CS-RZ
Output rise and fall times
NRZ
Pulse width (FWHM)
RZ
CS-RZ

Vpp(dBm) 0.22 (-9) 0.28 (-7) 0.4 (-4)
0.5 (-2) 0.6 (0)1.2 (6)dB
111312141214151816ps
910psps

Position of crossing point @ NRZ%

4520%…80% as displayedon oscilloscopemeasured with 70 GHz
detector and 70 GHzsampling scope

1215Output timing jitter <RMS>
NRZRZ
CS-RZ

SHF 46210 B – V001 – 23/Oct/2006

measured between data
‘1’ and long sequence of
‘0’

1.0
0.4
0.4

1.2
0.5
0.55055

Measured with SHF
Pattern Generator with low
jitter output option,
precision timebase DCA.
De-embedded from 40
Gbps NRZ electrical data
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SHF reserves the right to change specifications and design without noticeDPSK mode operation
Drive amplifier input level
Data
Clock pulse RZ
Phase modulation by 2 Vπ drive

Vpp(dBm) 0.36 (-5)
0.5 (-2)
Rad0

0.6 (0)0.8 (2)
1.2 (6)π

Auto-bias control (ABC)
Dither signal frequency

kHz101(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)

Absolute maximum ratings
Parameter

Unit

Min.

Typ.

Max.

Conditions

Optical input power

dBm

17

NRZ data amplifier input powerdBm

10

NRZ data

RZ clock driver input powerdBm

10CWGeneral specifications
Parameter

Unit

Min.

Typ.

Weightkg3.3

Dimensions

mm

59x213x450

Power consumption

W

20.5

Operating temperature°C

10Conditions
w/o Frontpanel Connectors

35

Electrical data input connector

V (1.85mm)

Clock input connector

K (2.9mm)

Optical connectors

FC/PC

SHF 46210 B – V001 – 23/Oct/2006

Max.

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SHF reserves the right to change specifications and design without noticeTest Measurements
The following equipment was used in obtaining these results:
SHF12100 A S/N 2 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

44 Gbps electrical signal. S/N: 15.9; RMS Jitter: 465 fs

SHF 46210 B – V001 – 23/Oct/2006

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

44 Gbps NRZ optical output signal. S/N: 20.1; RMS Jitter: 862 fs

44 Gbps RZ optical output signal. S/N: 32.1; RMS Jitter: 356 fs

44 Gbps CS-RZ optical output signal. S/N: 21.2; RMS Jitter: 281 fs

SHF 46210 B – V001 – 23/Oct/2006

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

RZ-DPSKtap coupler

Tx

Opt.out

15mW

optical amplifiers

OBPF

Clock in Data in

ClockOpt. inPowermeter

Data

DPSK Receiver
Elec. out

40Gbps BPG
Clock

Data

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

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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

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SHF reserves the right to change specifications and design without noticeChange note:'46210A V1.1 -> '46210B V001
page 1:email adress, title
page 2
description
page 3
insertion loss
data rate limitation
page 3/4
data input sensitivity
page 4
Popt max 17 dBmSHF 46210 B – V001 – 23/Oct/2006

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SHF reserves the right to change specifications and design without notice