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.deDatasheet
SHF 46210 C
Multi-format Optical Transmitter
Plug-InSHF reserves the right to change specifications and design without notice – SHF 46210C - V001 – 16.03.2009

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Description
The SHF 46210 C is an optical transmitter unit. This is a half-width plug-in for the SHF 10000 A
mainframe. Field installation or upgrade by the end-user is possible for this equipment.
The SHF 46210 C Optical Transmitter converts electrical signals into optical signals at a data rate of up to50 Gbps. It is able to encode the data in ASK (amplitude shift keying) and DPSK (differential phase shiftkeying) formats. With NRZ, Conventional RZ and Carrier Suppressed RZ, a total of six formats aresupported. When used in DPSK mode, the SHF 47210 DPSK Optical Receiver is an ideal instrument fordecoding the signal.
ASK is the more familiar method used in optical communications. The light intensity is varied so that lighton corresponds to "1" and light off corresponds to "0", or vice versa. DPSK is a well-known coding
method which has recently received interest in the transmission of high bit rate signals through opticalfibers. Data is encoded by changing the phase of the light. Compared to the more conventional ASK,DPSK offers higher sensitivity and enhanced robustness against the impact of non-linear effects inDWDM transmission.
The main elements of the SHF 46210 C are two thermally stable Chirp-free Lithium Niobate MachZehnder modulators which are each driven by an individually optimized amplifier. For the RZ modes, anamplifier 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 second modulator. The pulsed light isthen modulated by the data signal. In this way, RZ signals are produced 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••••••••50 Gbps optical data streams< 9 ps rise and fall time digital optical signals at 44 Gbps
50 kHz to >40 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

SHF reserves the right to change specifications and design without notice – SHF 46210C - V001 – 16.03.2009

Page 2/9Specifications – SHF 46210 CParameter

Unit

Min.

Typ.

Max.

Comment

Optical parameters
Wavelength range

C- and L-band

Insertion lossdB

11

DC Extinction ratiodB

20

Return loss

dB30

Chirp (Alpha parameter)

13connector to connector,
maximum transmission
without modulation

without optical connector

0.2

small signal measurement
method 1

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

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

Gbps-3dB electrical

2536
64450

dB-10-10

ASK-Mode operation (Datarate 36 ... 44 Gbps)
Drive amplifier input level
Data input
RZ clock input
Dynamic extinction ratio
NRZRZ
CS-RZ
Dynamic signal to noise ratio
NRZRZ
CS-RZ
Output rise and fall times
NRZ
Pulse width (FWHM)
RZ
CS-RZ

Vpp(dBm) 0.22 (-9) 0.28 (-7)
0.5 (-2) 0.6 (0)dB
1113121412140.4 (-4)
1.2 (6)
measured between data
‘1’ and long sequence of‘0’15
1816ps910ps

measured with 70 GHz
detector and 70 GHz
sampling scope

1215Output timing jitter <RMS>
NRZ
RZ
CS-RZ

ps

Position of crossing point @ NRZ%

4520%…80% as displayedon oscilloscope

1.0
0.4
0.4

1.2
0.5
0.5

5055

Measured with SHF
Pattern Generator with low
jitter output option,
precision timebase DCA.
De-embedded from 40
Gbps NRZ electrical data
sourceSHF reserves the right to change specifications and design without notice – SHF 46210C - V001 – 16.03.2009

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Parameter

Unit

Min.

Typ.

Max.

0.6 (0)0.8 (2)
1.2 (6)πComment

DPSK mode operation
Drive amplifier input level
Data
Clock pulse RZ
Phase modulation by 2 Vπ drive

Vpp(dBm) 0.36 (-5)
0.5 (-2)
Rad0

Auto-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 power

dBm

17

NRZ data amplifier input powerdBm

10

NRZ data

RZ clock driver input powerdBm

10CW

General specifications
Parameter

UnitMin.

Typ.

Weightkg3.3Dimensions

mm

59x213x450

Power consumption

W

20.5

Operating temperature°C

10Max.

Conditions
w/o Frontpanel Connectors

35Electrical data input connector

V (1.85mm)

Clock input connector

K (2.9mm)

Optical connectors

FC/PC

SHF reserves the right to change specifications and design without notice – SHF 46210C - V001 – 16.03.2009

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Test Measurements
The following equipment was used in obtaining these results:
SHF12100 A S/N 2 Pattern Generator
SHF 1550DFB Laser source set to 15mW output power @ 1550 nm.
AMPAQ EDFA + bandpass filter
Agilent 86100A DCA with 70GHz plugin and precision timebase module
ASK signals detected with 70 GHz photodetector; DPSK signals detected with a SHF 47210
Typical transmitter data input signal

44 Gbps electrical signal. S/N: 15.9; RMS Jitter: 465 fs

SHF reserves the right to change specifications and design without notice – SHF 46210C - V001 – 16.03.2009

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Transmitter in ASK-mode

44 Gbps NRZ optical output signal. S/N: 21, Jitter: 835 fs

44 Gbps RZ optical output signal. S/N: 26, Jitter: 263 fs

44 Gbps CS-RZ optical output signal. S/N: 27, Jitter: 348 fs
SHF reserves the right to change specifications and design without notice – SHF 46210C - V001 – 16.03.2009

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Transmitter in DPSK mode
optical attenuator
DFB Laser

RZ-DPSKtap coupler

Tx
OBPF

Opt.out

15mW

optical amplifiers

Clock in Data in
Clock

Opt. inPower
meter

Data

DPSK Receiver
Elec. out

40Gbps BPG
Clock
Measurement setup

Data

40Gbps EA

Receiver sensitivity

1e-02

1e-03

Biterrorrate

Bit error rate

1e-04
1e-05
1e-06
1e-07
1e-08
1e-09
1e-11
1e-13
1e-15
-46-44-42-40-38-36-34-32

Optical power (dBm)

Two measurements made under different conditions.
Magenta (left): 40 Gbps with a 70 GHz optical bandpass filter and a preamp with 4dB noise figure.
~45 photons/bit
Blue (right): 42.4 Gbps with a 1.2nm optical bandpass filter and a preamp with 5.5dB noise figure.
~71 photons/bit
Sensitivity limit: 20 photons/bit

SHF reserves the right to change specifications and design without notice – SHF 46210C - V001 – 16.03.2009

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Eye diagrams

44 Gbps NRZ-DPSK optical output signal. S/N: 19; RMS Jitter: 982 fs

44 Gbps RZ-DPSK optical output signal. S/N: 21

44 Gbps CS-RZ-DPSK optical output signal. S/N: 22SHF reserves the right to change specifications and design without notice – SHF 46210C - V001 – 16.03.2009

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Document History
46210A V1.1 -> '46210B V001
- page 1- page 2- page 3- page 3/4- page 4

email address, title
description
insertion loss / data rate limitation
data input sensitivity
Popt max 17 dBm'46210B V001 -> '46210C V001
- Renaming to 46210C- page 3
Negative slope chirp deleted- page 6
Eye diagrams replaced by new measurements- page 8
Eye diagrams replaced by new measurements

SHF reserves the right to change specifications and design without notice – SHF 46210C - V001 – 16.03.2009

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