SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23D • 12277 Berlin • Germany
Phone ++49 30 772 051-0 • Fax ++49 30 753 10 78
E-Mail: sales@shf.de • Web: http://www.shf.deDatasheet
SHF 46120 A
Optical Transmitter

SHF reserves the right to change specifications and design without notice – SHF 46120 A - V002 – 27.05.2015

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Description
The SHF 46120 A is a stand alone optical transmitter unit.
This optical transmitter converts electrical signals into optical signals at a data rate of up to 50 Gbps inASK (amplitude shift keying) format.
The main element of the SHF 46120 A is a thermally stable Chirp-free Lithium Niobate Mach-Zehnder
modulator which is driven by an individually optimized amplifier.
The temperature stable modulator and an automatic bias circuit ensure high stability of the output signal.

Features






50 Gbps optical data streams< 9 ps rise and fall time digital optical signals at 44 Gbps
Modulators’ bias condition controlled automatically
SONET/SDH compatible
Stressed eye generation for optical compliance testing
Interference input to set the Vertical Eye Closure Penalty (VECP)Functional block diagram

AC-coupled

SHF reserves the right to change specifications and design without notice – SHF 46120 A - V002 – 27.05.2015

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Specifications – SHF 46120 A
Parameter

Unit

Min.

Typ.

Max.

Conditions

Absolute Maximum Ratings
Optical Input PowerdBm

17

Data Input Level

Vpp(dBm)

210

Interference Input Level

Vpp(dBm)

210V

6DC Input Voltage(Data & Interference Input)

NRZ data

Optical Parameters
Wavelength Range

nm1550 & 1310

Insertion LossdB5

DC Extinction Ratio

dB20

Return LossdBtbd

6connector to connector,maximum transmission
without modulation

Electrical and electro-optical parameters
Electro-Optical Bandwidth ofModulator

GHzMin. Bit Rate

Gbps

Max. Bit Rate
Electrical Return Loss of Data Input
Data Input Level

Dynamic Extinction Ratio

Output Timing Jitter <RMS>

Crossing NRZ-3dB electrical

24450

dB-10

Vpp
(dBm)

0.2 (-10)
0.3 (-6.5)
0.4 (-4)

dB

12dB

10
1612

Dynamic Signal to Noise Ratio
Output Rise and Fall Times

18

ps%

45

Frequency Range Interference
Input

Hz50 K

Input Voltage Interference Input

Vpp

1 MHz – 20 GHz

ExtRatio = 6 dB
ExtRatio = 10 dB
ExtRatio = 12 dB
Data input level : 0.4 V …
0.5 V,  44 Gbps

13Data input level : 0.4 V …
0.5 V,  50 Gbps

 44 Gbps
 50 Gbps

181020%…80% as displayedon oscilloscope

1.0

1.2

Measured with SHF
Pattern Generator,
precision timebase DCA.
De-embedded from 44
Gbps NRZ electrical data
source

50

55

9ps

-7

Interference Input
700 M
1Auto-bias control (ABC)
Dither Signal Frequency

kHz

10SHF reserves the right to change specifications and design without notice – SHF 46120 A - V002 – 27.05.2015

Page 3/6General specifications
ParameterUnit

Min.

Typ.

Weightkg

0.82

Dimensions (W x H x D)mm

115 x 64 x 174

Power Consumption

W10

Operating Temperature°C

10Max.

Conditions
w/o Frontpanel Connectors

35

Electrical Data Input Connector

K (2.9mm) female

Interference Input Connector

K (2.9mm) female

Optical Connectors

FC/PC

PMF in, key aligned toslow axis,
SMF out

SHF reserves the right to change specifications and design without notice – SHF 46120 A - V002 – 27.05.2015

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Stressed eye generation
When driving the transmitter with an input signal below the compression level of ~ 500 mVpp, a stable but
impaired eye diagram is generated.
Additional stress can be superposed by adding an external interference signal via a dedicated interference
input.

44 GBit/s

No interferer

200 mVppinterference

400 mVppinterference

600 mVppinterference

Best signalquality
650 mVdrive amplitude

Interference has no significant influence on signal
S/N:
16.9
ExtRatio:11.8 dB
Interference has nosignificant influenceon signal

380 mVdrive amplitude
S/N:
13
ExtRatio: 11.1 dB

S/N:
11.8
ExtRatio: 10.9 dB

S/N:
11.3
ExtRatio: 10.6 dB

280 mVdrive amplitude
S/N:
8.6
ExtRatio: 9.3 dB

S/N:
8.3
ExtRatio: 9.2 dB

S/N:
7.4
ExtRatio: 9.2 dB

S/N:
6.4
ExtRatio: 9.1 dB

S/N:
7
ExtRatio: 6.0 dB

S/N:
6.1
ExtRatio: 6.0 dB

S/N:
5
ExtRatio: 6.2 dB

S/N:
~3.5
ExtRatio: ~6 dB

200 mVdrive amplitude

SHF reserves the right to change specifications and design without notice – SHF 46120 A - V002 – 27.05.2015

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Outline Drawing
ABCReset

SHF 46120 A Transmitter
Interference
Input

Data
Input

50

50

OpticalOutputDriverOnOffPowerOn
Off

12V / 3A

17.6

34.4

63.6

OpticalInput

282248

94
6888

173.7
182.7

All dimensions are specified in millimeters (mm).

SHF reserves the right to change specifications and design without notice – SHF 46120 A - V002 – 27.05.2015

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