Finisar
Product Specification
10Gb/s 120km Telecom CML
TM
13pin-GPO Butterfly Transmitter
DM80-01-0/1/2
PRODUCT FEATURES
•
•
•
•
•
•
•
•
High Performance CML
TM
Supports multi-bit-rate application,
from 9.95Gb/s to 11.1Gb/s
Supports link length up to 120km
without DCM
4-7dBm modulated output power
Case temperature range -5°C to
75°C
Supports application with and
without FEC
TDM, DWDM single channel
Covers ITU-T C- and L-band
channels (1527.773nm to
1605.744nm)
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•
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APPLICATIONS
•
Metro, Regional and Long haul
DWDM application
SONET/SDH OC-192, STM-64
10G Ethernet
10X Fibre Channel
Finisar’s DM80-01 butterfly transmitter module employs proprietary Chirp Managed
Laser (CML
TM
) technology and has been specifically designed to transmit 10Gb/s data
over physical distances up to 120km. The module is comprised of a directly-modulated
DFB laser chip and a co-packaged proprietary optical spectrum reshaper (OSR) passive
optical element. The OSR component also provides a frequency locking function and
allows operation on the ITU-T channels within ±2.5GHz with coverage across both C-
band and L-band for DWDM versions. Also included in the standard butterfly footprint
are 2 photo-detectors for power control and wavelength locking, together with 2 TECs for
temperature stabilization. Key specifications for the optical and electrical characteristics,
physical requirements, environmental conditions and reliability/quality requirements are
detailed in this document.
Note:
Long version of this document with more detailed optical and electrical parameter
specification is available upon request.
.
©
Finisar Corporation –10-May-07
Rev_A
Page 1
DM80-01-0/1/2 CML
TM
Butterfly Transmitter Product Specification – May 2007
Finisar
I. Internal Optical Layout
Isolator
PD2
L1
L2
OSR
DFB
Fibre stub
Isolator
TEC
Beamsplitter
PD1
Window
Figure 1
Figure 1. CML internal layout
The DM80-01 modules uses a 10Gb/s directly modulated DFB chip co-packaged with an
optical spectral re-shaper (OSR) element as shown in Figure 1. An optical isolator is
included between the DFB and the OSR while a beam-splitter component and 2
photodetectors are configured to allow frequency locking. Lens#1(L1) is used to
collimate the DFB laser output and pass the beam through the splitter and OSR, prior to
coupling into single-mode fiber using Lens#2 (L2). A second isolator is included in the
fiber pigtail to minimize the effect of external back-reflections on module performance.
II. Control Method
The schematic in Figure 2 shows the key components and control loops that are used to
operate the module. The output power of the DFB is monitored by photodetector PD1.
Photodetector PD2 monitors the back-reflection from the OSR. The photocurrent ratio
from the two detectors is used to lock the relative spectral locations of the laser and the
OSR via temperature control of the DFB using TEC#1. A second TEC (TEC#2) controls
the temperature of the OSR and locates the operating point of the OSR on the ITU grid
for DWDM applications.
©
Finisar Corporation –10-May-07
Rev_A
Page 2
DM80-01-0/1/2 CML
TM
Butterfly Transmitter Product Specification – May 2007
Finisar
Constant
Output Power
Constant Temperature
Modulation
Current
Bias
Current
Thermistor#2
Thermistor#1
DFB
TEC#1
PD1
PD2
OSR
TEC#2
Start Up Temperature
Constant Photodetector
Ratio (locker)
Figure 2: Control schematic for DM80-01 Module
III. Absolute Maximum Ratings
Table 1: Absolute maximum ratings
Item
Parameters
1. Storage Temperature
2. Heat Soldering Temperature
3. Returned Fiber Power
4. Laser Forward Current
5. Laser Reverse Voltage
6. PD Forward Current
7. PD Reverse Voltage
8. TEC Current
9. TEC Voltage
10. Transient Cooler Current
11. Tolerable External Reflection
12. Optical Return Loss
Conditions
on leads, 6 seconds max
CW, 1 second transient
Peak
Peak
CW
CW
DC
DC
1 sec
Min
-40
-1.9
-1.9
Max
85
260
13
200
2
1
2
1.9
1.8
1.9
-14
-27
Units
°C
°C
dBm
mA
V
mA
V
A
V
A
dB
dB
©
Finisar Corporation –10-May-07
Rev_A
Page 3
DM80-01-0/1/2 CML
TM
Butterfly Transmitter Product Specification – May 2007
Finisar
IV. Standard Operating Specifications
Table 2: Standard Operating Requirements
Min
Item
Parameters
Typ
Max
Units
Comments
All the following
transmission
parameters are
tested at 9.95 or
10.7Gb/s
1.
Bit Rate
9.953/10.7
11.1
Gb/s
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Operating Case
Temperature Range
Wavelength (SOL)
Locked deviation from
ITU
Modulated Output Power
(EOL)
Operating Drive current
(SOL)
Allowed Deviation from
SOL drive current over
life and temperature
Required Resolution of
Operating Drive Current
SMSR
Wavelength temperature
tuning coefficient
Wavelength current
tuning coefficient
Laser threshold current
Forward Bias Voltage
-5
ITU-T Grid
-2.5
4
70
-15
75
°C
GHz
ITU-T wavelength
grids defined in
Tables 9 & 10
EOLOT
SOL operation
condition to be
discussed.
2.5
7
100
20
0.09
GHz
dBm
mA
%
mA
dB
nm/°C
pm/m
A
mA
V
dB/Hz
MHz
Ohms
360mA/4096 levels
35
40
0.1
7
25
1.8
-135
2
50
10
14. RIN
15.
Laser CW Linewidth
(FWHM)
16. Module Input Impedance
17.
Peak to Peak voltage,
Vpp
1.2
0 to 10 GHz,
Measured before
OSR is installed
Measured before
OSR
Recommend use of
EML driver
technology
Into 50ohm
Customer must
provide adjustment
capability on
electrical driver
BT Filter OFF
BT Filter OFF
tbc
Before OSR
Receiver threshold
optimized for
1.8
2.5
V
18. Electrical input crossing
Extinction Ratio
(EOLOT)
Optical crossing
S11
S21 (3dB BW)
Power dispersion Penalty
@ 30dB OSNR, 9.95Gbs,
25
80
%
19.
20.
21.
22.
23.
9
tbc
Mask
10
tbc
dB
%
dB
GHz
dB
2
©
Finisar Corporation –10-May-07
Rev_A
Page 4
DM80-01-0/1/2 CML
TM
Butterfly Transmitter Product Specification – May 2007
Finisar
transmission, to be
discussed
Receiver threshold
optimized at BB and
1600ps/nm
BER=10
-12
, 1600ps/nm
(EOLOT)
1
OSNR dispersion Penalty
24. @ BER=10
-4
, 10.7Gbs,
1600ps/nm (EOLOT)
1
2
dB
Note:
1. Please call Finisar to discuss the receiver configuration, including types of PIN/APD,
and power level into APD, and the type of CDRs are used. 2400ps/nm transmission
is possible with trade-off between back-to-back eye diagram and transmission
performance; DM80-01 is also compliant with the newly accepted ITU 10Gbps
120km standard P1V1-2C2
V. Mechanical Details
Figure 3: Package Outline Drawing
©
Finisar Corporation –10-May-07
Rev_A
Page 5
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