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Description
The Alcatel 1915 LMM contains an Alcatel
DFB laser with monolithically integrated
electro-absorption modulator (ILM).
The modulation voltage is applied to the
modulator section while the DFB laser
operates CW. Without the complexity of
LiNbO3 external modulators, the Alcatel
1915 LMM is dedicated to STM64/OC-192
bit rate with reduced size and reduced cost.
This device allows 10 Gbit/s data
transmission with an extinction ratio higher
than 10 dB and less than 2 V modulation
voltage.
The Alcatel 1915 LMM is optimised for
10 Gbit/s TDM and WDM transmission
systems supporting dispersion from 50
ps/nm to 1600 ps/nm.
Features
• 7-pin package with either GPO or K connector
RF input
• High frequency RF connector package with
50 Ω RF impedance
• InGaAsP monolithically integrated DFB laser and
modulator chip
• Low drive voltage (≤ 2 Vpp)
• Very low dispersion penalty over 40 km for
10 Gbit/s operation (over 800 ps/nm)
• Internal optical isolator, monitor photodiode,
thermistor and thermo-electric cooler
• High power available
Applications
• STM-64 and OC-192 transmission systems
• Terminals for submarine transmission systems
• Intermediate reach 10 Gbit/s applications
ITU IR-2
• Short reach 10 Gbit/s applications ITU S-64.2
Optical characteristics
Parameter Symb. Conditions Min Typical Max Units
Threshold current Ith CW, Vbias = 0 V 5 17 35 mA
Operating current Iop CW, Vbias = 0 V 50 80 100 mA
Optical output power PAVE Iop, Vmod, [1], [2] 0 dBm
Laser forward voltage VF CW, Iop, Vbias = 0 V 2 V
Modulator bias voltage Vbias See [1] - 2 0 V
Modulator drive voltage Vmod See [1] 2 V
Dynamic extinction ratio DER Iop, [1], [2] 10 dB
Emission wavelength λm 1527 1570 nm
Side mode suppression ratio SMSR @ Iop 35 dB
Cut off frequency S21 - 3 dB, Vbias = - 1 V 8 GHz
RF return loss S11 DC to 7 GHz 10 dB
S11 7 to 10 GHz 7 dB
Dispersion penalty ∆S See [1], [2] 2 dB
Tracking error TR Tsubmount = 25 °C, Tcase = 70°C
If = 100 mA, Q = 10 log {[P(70 °C)-P(25°C)]/P(25 °C)}
- 0.5 0.5 dB
Rise time / Fall time Tr/Tf See [1], 10%, 90% 30 45 ps
Monitor diode current Im Iop, VM = - 5 V 20 1500 µA
Dark current Id 0.1 µA
TEC current It ∆T= 45 °C, Iop= 120 mA, TC
= 70 °C, Vbias= - 1 V 1 1.3 A
TEC voltage Vt ∆T= 45 °C, Iop= 120 mA, TC
= 70 °C, Vbias= - 1 V 2 2.5 V
Thermistor resistance RTH
9.5 10.5 KΩ
Notes : All limits start of life, Tcase in the range [0°C ; 70°C], Tsubmount = 25 °C, monitor bias = - 5 V, unless otherwise stated.
[1] BER = 10-10; 9.953 Gbit/s modulation; 223-1 PRBS; NZR line code [2] 800 ps/nm dispersion, assuming fiber with an average dispersion of 18 ps/nm/km
Absolute maximum ratings
Parameters Min Ma
x
Unit
O
p
eratin
g
case tem
p
erature 0 70 °C
Stora
g
e tem
p
erature -40 85 °C
Laser forward current 150 m
A
Laser reverse volta
g
e 2
V
Modulator forward volta
g
e 1
V
Modulator reverse volta
g
e 5
V
Photodiode forward current 1 m
A
Photodiode reverse volta
e20
V
TEC Volta
g
e2.8
V
TEC Current 1.4
A
ESD a
pp
lied on modulator 500
V
ESD a
pp
lied on laser
[
1
]
2000
V
Lead solderin
g
time
(
at 260°C
)
10 s
Packin
g
Mountin
g
Screw Tor
q
ue 0.2 nm
[1] Human body model Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only.
A
lcatel 1915 LMM
Single Channel - 800 ps/nm application
10 Gbit/s digital Laser Module with integrated electro-absorption Modulator
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Major Characteristics
Fig. 1 Return Loss Response Fig. 2 Typical Bit Error Rate
Fig. 3 Typical Extinction Ratio versus Bias Voltage Fig. 4 Typical Filtered Output Eye Diagram
with a Driver circuit (without fiber ;
see recommended circuit in Application Note)
9.953 Gbit/s, 223-1 PRBS NRZ, Tc=25 °C,
Tsubmount = 25°C, If = 80 mA, Pave and DER≥10 dB
-40
-35
-30
-25
-20
-15
-10
-5
0
0,0 2,5 5,0 7,5 10,0 12,5 15,0
Frequency (GHz)
Return Loss (5 dB/div)
50 Ω Test
If = 80 mA,
Pave,
Tcase = 25 °C
15 ps/div
-2-1,5-1-0,50
Vbias (V)
SER (dB)
-5
- 10
-15
1,E-04
1,E-05
1,E-06
1,E-07
1,E-08
1,E-09
1,E-10
1,E-11
1,E-12
-20 -19 -18 -17 -16 -15 -14
Received Optical Power (dBm)
Bit Error
Rate
0 km
40 km fiber
9.953 Gbit/s, 223-1
PRBS, NRZ line
code,
If = 80 mA,
Pave,
Tcase = 25 °C
DER ≥ 10 dB
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Qualification, Reliability and Standards
Alcatel Optronics policy for all products is to carry out a complete qualification program. This qualification is based on
manufacturers’ qualification in agreement with Telcordia GR-468-Core (Generic Reliability Assurance Requirements for
Optoelectronic Devices Used In Telecommunications Equipment - Central Office Level), MIL STD 883E (Test method and
procedures for microelectronics) and following the standards ITU-T G652 and G-691.
All products pass strict tests before shipping. Failure criteria are defined during the product qualification process.
Device marking
The device shall be legibly and permanently marked with the following information:
Alcatel logo
Product family name: A 1915 LMM
Product code : 3CN number (see Ordering information section)
Serial number
Shipment packing
Each device is individually packed in an anti-static container and in such a manner as to prevent damage in transit.
The packing shall include the following information:
Alcatel logo
Product family name : A 1915 LMM
Product code : 3CN number (see Ordering information section)
Serial number
Hazard warning label (ESD)
Laser Safety Class Label
Deliverable data
The following data shall be supplied with each device :
L(I) / V(I) / Ipd(I) curves
Values for Vmod, Von (On-state voltage [0 data]), DER, S0 (received optical power without fiber), ∆S and Pave for If
Plot of SER vs Vmod @ If = 80 mA over the range 0 V to –3 V and Tcase = Tsubmount = 25 °C
DER and dispersion penalty (∆S)
Laser Safety information
Take appropriate precautions to prevent undue
exposure to naked eye.
This product is classified Class 3A Laser Product according
to IEC-60825-1.
FDA/CDRH Class IIIb laser product. All versions are Class
IIIb laser products per CDRH, 21 CFR 1040 Laser. Safety
requirements under accession number 0120546-00.
LASER RADIATION
AVOID EXPOSURE TO BEAM
Class 3A laser product
Handling
This product is sensitive to electrostatic discharge and should not be handled except at a static free workstation. Take
precautions to prevent ESD; use wrist straps, grounded work surfaces and recognised anti-static techniques when
handling the Alcatel 1915 LMM module.
Handle the laser module by its package only, never hold it by its pigtail.
Care should be taken to avoid supply transient and over voltage. Over voltage above the maximum specified in absolute
maximum rating section may cause permanent damage to the device.
ATTENTION
OBSERVE
PRECAUTIONS FOR
HANDLING
ELECTROSTATIC
DISCHARGE
SENSITIVE DEVICES
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Mechanical details
Pin out
N° Description
1Thermistor
2Thermistor
3 Laser DC bias (+)
4 Photodetector Anode (-)
5 Photodetector Cathode (+)
6TEC (+)
7TEC (-)
Ordering information
Alcatel 1915 LMM
Application Part number Electrical
Connector
Optical
Connector
800 ps/nm 3CN00315AA K type FC/PC type
800 ps/nm 3CN00321AA GPO type FC/PC type
January 2002
Copyright © 2002
Alcatel Optronics
Customized versions
are available for large
quantities.
Performance figures
contained in this
document must be
specifically confirmed
in writing by Alcatel
Optronics before they
become applicable to
any particular order or
contract. Alcatel
Optronics reserves the
right to make changes
to the products or
information contained
herein without notice.
For additional information, contact
your Alcatel Optronics Account
Manager, or the following :
INTERNET
http ://www.alcatel.com/optronics
E-MAIL
optronics@alcatel.com
EUROPE
France : (+33) 1 64 49 47 00
UK : (+44) 1506 42 60 00
USA
Chantilly – VA : (+1) 703-679-6715
Plano – TX : (+1) 972-477-54 53
CANADA
Gatineau : (+1) 819 243 3755
ASIA - PACIFIC
Japan : (+81)-3-5302-4341
China : (+86) 755 6981 471
GPO Connector K Connector
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