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 46121 COptical Transmitter

SHF reserves the right to change specifications and design without notice – SHF 46121 C - V001 – 02.03.2017

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Description
The SHF 46121 C is a stand-alone optical transmitter unit.
This optical transmitter converts electrical signals into optical signals at a data rate of at least 56 Gbps inASK (amplitude shift keying) format.
PAM signal generation is possible up to ~ 40 GBaud when driving the data input with an electrical PAMsignal.
The main element of the SHF 46121 C 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
••
•
•
•
•
•
•
•

≥ 56 Gbps optical data streams< 9 ps rise and fall time digital optical signals
PAM 4 up to 40 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)
2 optical input power ranges available:o Standard power range: +6 … +13 dBm
o Low power option:
0 … + 10 dBm .

Functional Block Diagram

AC-coupled

SHF reserves the right to change specifications and design without notice – SHF 46121 C - V001 – 02.03.2017

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Specifications – SHF 46121 C
Parameter

UnitMin.

Typ.

Max.

Conditions

Absolute Maximum Ratings
Optical Input PowerdBm

13

Data Input Level

Vpp

VData_max = 2 V -VInterference

Interference Input Level

Vpp

VInterference_max = 2 V -VData

DC Input Voltage(Data & Interference Input)

V±9The sum of data input andinterference input shall not
be larger than 2 V

Optical Parameters
Wavelength Range

nm1550 +/- 50

Insertion LossdB

7

DC Extinction Ratio

dB>20

Return LossdB>20

8connector to connector,
modulator at quadrature
point

Electrical and electro-optical parameters
EO Bandwidth of Modulator

GHz20-3dB electrical

EO Bandwidth of Transmitter

GHz22-3dB electrical

Optical input powerdBm

Min. Bit Rate

13010Gbps

Max. Bit Rate
Electrical Return Loss of Data Input

6Standard ABC operating
range
Option low power

256

Criteria: Ext.Ratio & S/N@ PRBS 27-1 … 231-1

60
10Data Input Level @ 32 Gbps

Vpp

0.075
0.18
0.3

ExtRatio = 2 dB
ExtRatio = 6 dB
ExtRatio = 12 dB

Data Input Level @ 56 Gbps

Vpp

0.075
0.18
0.35

ExtRatio = 2 dB
ExtRatio = 6 dB
ExtRatio = 11 dB

Dynamic Extinction Ratio range

dB0dB

9149Dynamic Signal to Noise Ratio
Output Rise and Fall Times

ps71 MHz – 20 GHzdB13ABC operating range
Data input level : 0.3 V …
0.5 V, ≤ 56 Gbps, PRBS

≤ 50 Gbps,≤ 56 Gbps, PRBS

1611813914

ExtRatio >10 dB
ExtRatio < 7 dB *Note* Note: rise time 20%…80% as displayed on 70 GHz oscilloscope, measured with drive levelset to max. S/NSHF reserves the right to change specifications and design without notice – SHF 46121 C - V001 – 02.03.2017

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Electrical and electro-optical parameters

Output Timing Jitter <RMS>psCrossing NRZ%

1.0

1.2

Measured with SHF
Pattern Generator,
precision timebase DCA.
De-embedded from 32Gbps NRZ electrical data
source5055* Note5010045Interference Input
Low frequency limit

KHz

High frequency limit

MHzInput Voltage Interference Input

Vpp

700

1000
1Modulator Auto-bias control (ABC)
Dither Signal Frequency

kHz

1* Note: Input crossing = 50 %, signal measured @ ExtRatio 0…12 dB

General Specifications
Parameter

Unit

Min.

Typ.

Weightkg

0.82

Dimensions (W x H x D)mm

221 x 51 x 177

Power Consumption

W

10

Operating Temperature°C10Max.

Conditions

w/o Frontpanel -Connectors+12V switching power
supply is included

35

Electrical Data Input Connector

K (2.9mm) female

Interference Input Connector

K (2.9mm) female

Optical Connectors

FC/PC* NotePMF in, key aligned to slowaxis,
PMF out* Note: Other connectors available on request

SHF reserves the right to change specifications and design without notice – SHF 46121 C - V001 – 02.03.2017

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Stressed Eye Generation
When driving the transmitter with an input signal below the compression level of ~ 300 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.
31

Measurements taken at 32 GBit/s, PRBS 2 -1. Data source: SHF 12104 BPG + SHF 613 DAC

32 GBit/s

No interferer

200 mVppinterference

400 mVppinterference

600 mVppinterference

S/N:
16.9
ExtRatio:11.8 dB

S/N:
16.9
ExtRatio:11.8 dB

S/N:
16.9
ExtRatio:11.8 dB

S/N:
16.9
ExtRatio:11.8 dB

S/N:
21
ExtRatio: 9 dB

S/N:
12ExtRatio: 9.1 dB

S/N:
7.1
ExtRatio: 8.5 dB

S/N:2ExtRatio: 5 dB

S/N:
14.5
ExtRatio: 5.3 dB

S/N:
5.9
ExtRatio: 5.2 dB

S/N:
1.7
ExtRatio: 3.4 dB

Best signalquality
270 mVdrive amplitude

220 mVdrive amplitude

150 mVdrive amplitude

75 mV
drive amplitude

S/N:
11.2
ExtRatio: 2.4 dB

SHF reserves the right to change specifications and design without notice – SHF 46121 C - V001 – 02.03.2017

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Typical ASK Results
32 GBps

44 GBps

50 GBps

56 GBps

Typical PAM4 Results
32 GBaud

40 GBaud

SHF reserves the right to change specifications and design without notice – SHF 46121 C - V001 – 02.03.2017

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Outline Drawing
SHF 46121 C

Optical Transmitter
InterferenceInput

PowerDataInput

OnOff50.8

OpticalInput

50 Ω /2.92 mm Female

FC

OpticalOutput

Outputs
Error

On
OffFC

221.4

177

6.5

5.3

214

3

2

7.2

9.4

1
32.5
69.28

24.5
100
137.5

dacb
ABC Cal.

12 V / 1 A
Pos. Slope

Neg. Slope

Pos.

Designation

Connector

Pos.

Designation

12

Optical Input
Interference Input

FC
2.92mm (K) Femaleab

ABC Calibration
Positive Negative Slope switch

34Data Input
Optical Output

2.92mm (K) Female
FCcdGND
Power Supply

All dimensions are specified in millimeters (mm).

SHF reserves the right to change specifications and design without notice – SHF 46121 C - V001 – 02.03.2017

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