SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23 D • 12277 Berlin • Germany
Phone +49 30 772051-0 • Fax +49 30 7531078
E-Mail: sales@shf.de • Web: http://www.shf.deDatasheet
SHF 11124 AClock Recovery

SHF reserves the right to change specifications and design without notice – SHF 11124 A - V001 – Feb 9, 2012

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Description
The SHF 11124 A Clock Recovery is designed to extract and synchronize the clock from an optical data
stream. It operates at bit rates from 19 to 26 (CR25) or 25.3 to 32 (CR28) Gbps. An internal synthesizer
provides a reference clock for the whole bit rate range.
By using a tap coupler, the optical input signal appears at the optical output with only minimum
attenuation.
The extracted optical signal is converted by a receiver to an electrical signal which is processed by theclock recovery circuit.
The SHF 11124 A can be operated locally by the front panel or remote controlled via Ethernet-connection
from a PC running the SHF BERT Control Center control software (BCC). Its programming features allow® 1™ 2
automated measurements using test programs like AGILENT VEE or National Instruments LabVIEW .
The module is a compact solution which offers superb performance while including easy to use features.

Features•••

Operating bit rate range from 19 to 26 Gbps (Option CR25) or 25.3 to 32 Gbps (Option CR28)
Clock output frequency at full, half and quarter of the nominal input data bit rate
Local or remote operation via Ethernet-connection to a PC (SHF BERT Control Center)

Options••••

Option CR25: With clock recovery 19 to 26 Gbps
Option CR28: With clock recovery 25.3 to 32 Gbps
Option TC60: Optical tap coupler with a 60/40 ratio (60% of the inserted optical power is fed through)Option TC90: Optical tap coupler with a 90/10 ratio (90% of the inserted optical power is fed through)Please note that only one clock recovery option and one tap coupler option could be ordered at the sametime. Other tap coupler ratios are available on request.

Applications
••
•
•
•

R&D for optical communication systems at bit rates from 19 to 26 Gbps or 25.3 to 32 Gbps
Characterization of high speed optical components
Bit error rate testing
Optical component and fiber loop testing
Optical transmitter testing

1

AGILENT VEE is a registered trademark of Agilent Technologies, Inc., USA2LabVIEW is a registered trademark of NATIONAL INSTRUMENTS CORPORATION, USA

SHF reserves the right to change specifications and design without notice – SHF 11124 A - V001 – Feb 9, 2012

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Block Diagram
OpticalInput
Clock Recovery
ModuleOpticalOutput(full Bitrate)(Bitrate / 2)
(Bitrate / 4)

ClockOutput

Reference
ClockBert Control Centeror Front Panel

Precautions with Optical Connectors
The fiber optic connectors must be kept clean in order to ensure best performance of the SHF 11124 A.
Contaminated or damaged fiber ends result in performance degradation. Cover connectors with dust caps
when they are not in use.
The following cleaning procedure is recommended for the connector interface of the SHF 11124 A and theexternal connectors attached to these ports.
•

Before cleaning, the external connectors should be detached from the SHF 11124 A.

•To clean the fiber-end face, use a new natural cotton swab that is moistened with isopropyl alcohol.

•We recommend that no other solvents are used to clean the optical surfaces.

•Move the swab back and forth across the fiber end face several times applying a gentle pressure.

•Afterwards dry the fiber end face with a clean dry cotton swab or lens paper.

•Do not press the swab or lens paper too hard onto the fiber end face. This may damage the surface.

•

Use clean dry compressed air (free of dust, water and oil) to blow away any remains from the fiberend face. Nitrogen gas can also be used.

•

Use clean dry compressed air (free of dust, water and oil) to blow away any remains from the fiber
end face. Nitrogen gas can also be used.

Never exceed the maximum ratings of the optical input power.

SHF reserves the right to change specifications and design without notice – SHF 11124 A - V001 – Feb 9, 2012

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Specifications – SHF 11124 A
Parameter

UnitSymbol

Min.

Typ.

Max.

Comment

OpticalInput and Output Connectors

FC/PC

Wavelengthnm

Optical Insertion LossdB

Absolute max. Optical Input
PowerdBm

Optical Input Dynamic Range
at 1310 nm

Optical Input Dynamic Range
at 1550 nm

λ1300
1530

1330
1620
2.9
1.0

Opt. TC60Opt. TC90
7.0
13.0

Opt. TC60
Opt. TC90

dBm+1.7-1.2+8.1+5.1

Opt. TC60, CR25
Opt. TC60, CR28
Opt. TC90, CR25
Opt. TC90, CR28

dBm

-0.4-3.4+5.8+2.8

Opt. TC60, CR25
Opt. TC60, CR28
Opt. TC90, CR25
Opt. TC90, CR28

Clock / 4 Output (quarter bit rate)
Output Frequency

GHz

fout

4.75
6.33

6.5
8.0

Output Voltage (Vpp)

mV

Vout

400

700

ConnectorΩ

RMS-Jitter

350

CR25
CR28

2.92 mm (K) female

fsJRMS

1000

Output Frequency

GHzfout

9.50
12.65

1316

Output Voltage (Vpp)

mV

Vout

500800ConnectorΩClock / 2 Output (half bit rate)

RMS-Jitter

33

fs50
JRMS

CR25
CR28

2.92 mm (K) female800

on scope display, measured with Agilent 86100A with precision time base

SHF reserves the right to change specifications and design without notice – SHF 11124 A - V001 – Feb 9, 2012

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Parameter

Unit

Symbol

Min.

Typ.

Max.

Output Frequency

GHz

fout

9.50
12.65

1316

Output Voltage (Vpp)mVVout500800ConnectorΩComment

Full Clock Output (full bit rate)

RMS-Jitter

3fs50
JRMS

CR25
CR28

2.92 mm (K) female
600
800

CR25CR28240

47 … 63 Hz

General Data
Power Supply

V90

Power Consumption

WTBD

Weightkg

TBD

Dimensions (WxHxD)

mmOperation temperature°C

1035

Storage temperature°C

-20

70

Network Connection

Mbps

235 x 110 x 355

10 / 100

Ethernet, RJ-45

SHF reserves the right to change specifications and design without notice – SHF 11124 A - V001 – Feb 9, 2012

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