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 B
Optical Transmitter
1310 nm + 1550 nm

SHF reserves the right to change specifications and design without notice – SHF 46120 B - V002 – 10.01.2017

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Description
The SHF 46120 B is a stand alone optical transmitter unit.
The transmitter works in C+L band and O band.
This optical transmitter converts electrical signals into optical signals at a data rate of up to 50 Gbps inASK (amplitude shift keying) format.
PAM signal generation is possible up to ~ 32 GBaud when driving the data input with an electrical PAMsignal.
The main element of the SHF 46120 B 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





Dualband 1310 nm and 1550 nm
50 Gbps optical data streams
 10 ps rise and fall time compressed digital optical signals
PAM 4 up to 32 GBaud
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)
Selectable slope (positive slope / negative slope)

Functional block diagram

AC-coupled

SHF reserves the right to change specifications and design without notice – SHF 46120 B - V002 – 10.01.2017

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Specifications – SHF 46120 B
Parameter

UnitMin.

Typ.

Max.

Conditions

Absolute Maximum Ratings
Optical Input PowerdBm17Data Input Level

Vpp

VData_max = 2 V -VInterference

Interference Input Level

Vpp

VInterference_max = 2 V -VData

DC Input Voltage(Data & Interference Input)

V9Wavelength Range

nm1260 - 1360, 1530 - 1625
O band, C+L-band

Insertion LossdB

8

DC Extinction RatiodB

20

Return LossdB

tbd

The sum of data input andinterference input shall not
be larger than 2 V

Optical Parameters

9connector to connector,
modulator at quadrature
point

Electrical and electro-optical parameters (measured at 1550 nm)
EO Bandwidth of Modulator

GHz18-3dB electrical

EO Bandwidth of Transmitter

GHz20-3dB electrical

Optical input powerdBm

6Min. Bit Rate

Gbps

Max. Bit Rate

Gbps

Electrical Return Loss of Data Input

dB-10

Data Input Level

Vpp

0.075
0.2
0.4

Dynamic Extinction Ratio range

dB0

Dynamic Extinction Ratio

dB

10911

Dynamic Signal to Noise RatiodB

161018Output Rise and Fall Times

psOutput Timing Jitter <RMS>

ps15

ABC operating range

244

Criteria: Ext.Ratio & S/N@ PRBS 27-1 … 231-150-71 MHz – 20 GHz

ExtRatio = 2 dB
ExtRatio = 6 dBExtRatio = 12 dB

13ABC operating range
Data input level : 0.4 V …
0.5 V,  44 Gbps

 50 Gbps, PRBS
Data input level : 0.4 V …
0.5 V,  44 Gbps

 50 Gbps, PRBS

9131.010141.2

ExtRatio >10 dB
ExtRatio  7 dB *Note
Measured with SHF
Pattern Generator,
precision timebase DCA.
De-embedded from 32Gbps NRZ electrical data
source* Note: rise time 20%…80% as displayed on 70 GHz oscilloscope using a 70 GHz detector

SHF reserves the right to change specifications and design without notice – SHF 46120 B - V002 – 10.01.2017

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Electrical and electro-optical parameters
Crossing NRZ%

45505550100* NoteInterference Input
Low frequency limit

KHz

High frequency limit

MHzInput Voltage Interference Input

Vpp7001000
1Auto-bias control (ABC)
Dither Signal Frequency

kHz1* Note: Input crossing = 50 %, signal measured @ ExtRatio 0…13 dB

General specifications
Parameter

Unit

Min.

Typ.

Weightkg

0.82

Dimensions (W x H x D)mm

115 x 64 x 174

Power Consumption

W

10Operating 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* NotePMF in, key aligned toslow axis,
SMF out* Note: Other connectors available on request

SHF reserves the right to change specifications and design without notice – SHF 46120 B - V002 – 10.01.2017

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Stressed eye generation
When driving the transmitter with an input signal below the compression level of ~ 500 mV pp, a stable but
impaired eye diagram is generated.
Additional stress can be superposed by adding an external interference signal via a dedicated interference
input.
31Measurements taken at 32 GBit/s, PRBS 2 -1. Data source: SHF 12104 BPG + SHF 613 DAC
No interferer

300 mVpp (10 MHz)Interference

600 mVpp(10 MHz)
interference

900 mVpp(10 MHz)
interference

470 mVpp data
drive amplitude
S/N:
27
ExtRatio:14 dB

S/N:
27
ExtRatio:14 dB

S/N:
19
ExtRatio:13 dB

S/N:
12ExtRatio:12 dB

S/N:
21
ExtRatio: 10 dB

S/N:
15ExtRatio: 10 dB

S/N:
9ExtRatio: 10 dB

S/N:
2ExtRatio: 5.5 dB

S/N:
12ExtRatio: 6 dB

S/N:
6ExtRatio: 6 dBS/N:
2ExtRatio: 3.6 dB

S/N:-ExtRatio: -- dB

S/N:
9ExtRatio: 3 dB

S/N:-ExtRatio: -- dB

S/N:-ExtRatio: -- dB

330 mVpp data
drive amplitude

200 mVpp data
drive amplitude

100 mVpp data
drive amplitude

SHF reserves the right to change specifications and design without notice – SHF 46120 B - V002 – 10.01.2017

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Typical transmitter output signals
Data source: SHF 12104 BPG + SHF 613 DAC
Binary (NRZ)

28 GBit/s

32 GBit/s

44 GBit/s

50 GBit/s

S/N:15Jitter:721 fs
Crossing: 49 %ExtRatio: 6.8 dB

S/N:
14
Jitter:751 fs
Crossing: 50 %ExtRatio: 6.8 dB

S/N:
9.2
Jitter:738 fs
Crossing: 52 %ExtRatio: 6.2 dB

S/N:
7.3
Jitter:786 fs
Crossing: 50 %ExtRatio: 5.8 dB

S/N:
28
Jitter:765 fs
Crossing: 52 %ExtRatio: 13 dB

S/N:
28
Jitter:761 fs
Crossing: 51 %ExtRatio: 13 dB

S/N:
20
Jitter:695 fs
Crossing: 51 %ExtRatio: 12 dB

S/N:
15
Jitter:789 fs
Crossing: 51 %ExtRatio: 12 dB

Linear operation
220 mVpp data
drive amplitude

compressedoperation
460 mVpp data
drive amplitude

28 GBaud

32 GBaud

PAM4300 mVpp data
drive amplitude

SHF reserves the right to change specifications and design without notice – SHF 46120 B - V002 – 10.01.2017

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Outline Drawing
ABCReset

SHF 46120 B Transmitter
Optical
Input

Interference
Input

Data
Input

pos. Slope

OpticalOutput63.6

neg. Slope50
DriverOn
Off

12V / 3A

17.6

34.450
PowerOn
Off

28

2248

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 B - V002 – 10.01.2017

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