SHF Communication Technologies AG
Wilhelm-von-Siemens-Str. 23D • 12277 Berlin • Germany
Phone ++49 30 / 772 05 10 • Fax ++49 30 / 753 10 78
E-Mail: sales@shf.de • Web: http://www.shf.de„Preliminary“Datasheet
SHF 46211A
10 Gbps Multiformat OpticalTransmitterDescription
The SHF 46211A is an optical transmitter unit. This is a half-width plug-in for the SHF 10000A
mainframe. Field installation or upgrade by the end-user is possible for this equipment.
The SHF 46211A Optical Transmitter converts electrical signals into optical signals at a data rateof up to 12.5 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 47211A DPSK Optical
Receiver is an ideal instrument for decoding the signal.
ASK is the most popular 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 46211A 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 output
signal.

Features•••••••

Up to 12,5 Gbps optical data streams
9 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

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SHF reserves the right to change specifications and design without noticeSpecifications – SHF 46211 A
Parameter

Unit

Min.

Typ.

Max.

Comment

13

connector to connector,
maximum transmission
without modulation

Optical parameters
Wavelength range

C- and L-band

Insertion lossdB11DC Extinction ratio

dB22Return loss

dB35

Chirp (Alpha parameter)

-0.1

0911

without optical connector+0.1

small signal measurement
1method

Electrical and electro-optical parameters
Electro-optical bandwidth ofData modulatorGHz

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

Gbps
28-3dB electrical

12.5
12.5

dB-10-10

ASK-Mode operation (Datarate 8 ... 12.5 Gbps)
Drive amplifier input level
Data input
RZ clock input
Dynamic extinction ratio
NRZRZ
CS-RZ
Dynamic signal to noise ratioNRZ
RZ
CS-RZ
Output rise and fall times
NRZ
Pulse width (FWHM)
RZ
CS-RZ
Output timing jitter <RMS>
NRZ
RZ
CS-RZ
Position of crossing point @ NRZ

Vpp(dBm) 0.22 (-9) 0.28 (-7)
0.5 (-2) 0.6 (0)
dB
1113
12
14
1214
15
18
16tbd

ps

0.6 (0)1 (4)measured between data
‘1’ and long sequence of‘0’tbd

ps
33
67
ps%

45tbd

tbd

5055

DPSK mode operation
Drive amplifier input level
Data
SHF 46211A – V001 - 19/Feb/07

Vpp(dBm) 0.36 (-5)

0.8 (2)
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SHF reserves the right to change specifications and design without noticeClock pulse RZ
Phase modulation by 2 Vπ drive

Rad0.5 (-2)
00.6 (0)1.2 (6)πAuto-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 powerdBm

16

NRZ data amplifier input powerdBm10NRZ data

RZ clock driver input power

dBm

10CW

General specifications
Parameter

UnitMin.

Typ.

Weightkg

3.3Dimensions

mm

59x213x450

Power consumption

W20.5

Operating temperature°C

10Conditions
w/o Frontpanel Connectors

35

Electrical data input connector

ruggedized
2.92mmmale
connector

Clock input connector

ruggedized
2.92mmmale
connector

Optical connectors

FC/PC

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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:•Agilent 86100A Mainframe with 86118A 70GHz plug-in•

70 GHz Photodetector•BPG 44E Pattern Generator•DFB Laser source set to 15mW output power @ 1550 nm.

•AMPAQ EDFA + JDS Fitel optical bandpass•

DPSK measurements received with Mach-Zehnder Interferometer and photodetector on
constructive interference arm.

Typical transmitter data input signal

10 Gbps electrical signal

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SHF reserves the right to change specifications and design without noticeOptical output waveforms at 10Gbps
Transmitter in ASK-mode

Transmitter in DPSK-mode

ASK - 10 Gbps NRZ signal

DPSK - 10 Gbps NRZ signal

Eye S/N: 23.2; Jitter: 1.9ps; Ext. ratio: 14.9dB

Eye S/N: 19.5; Ext. ratio: 12.9dB

ASK - 10 Gbps RZ signal

DPSK - 10 Gbps RZ signal

Eye S/N: 39.4; Jitter: 0.9ps; Ext. ratio: 18.0dB

Eye S/N: 33.9; Ext. ratio: 16.2dB

ASK - 10 Gbps carrier suppressed RZ signal
Eye S/N: 37.0; Jitter: 0.9ps; Ext. ratio: 17.1dB

DPSK - 10 Gbps carrier suppressed RZ signal
Eye S/N: 28.9; Ext. ratio: 15.5dB

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SHF reserves the right to change specifications and design without notice