1
H
Coaxial Pigtailed Laser Module
Technical Data
LST262X
Features
• Compact Coaxial Package
• Wide Operating Tempera-
ture -40
°
C to +85
°
C
• Modulation Capability Up to
622 Mbit/s
• 200
µ
W Fiber Coupled
Power
• Convenient Variety of Pin
Out and Mounting Flange
Options
Description
The LST262X is a compact
coaxial pigtailed laser transmitter,
operating in the 1300 nm
wavelength region and coupling
light to single mode fiber. It is
designed for use in short and
medium distance networks with
bit rates up to 622 Mbit/s.
The device features a high
reliability laser diode and rear
facet monitor photodiode. These
are electrically connected to four
pins in an industry-standard
configuration.
Environmental performance is
designed to be compatible with
the requirements of Bellcore’s
TA-TSY-000983 document.
Options within the LST262X
family offer pinouts and pin
rotational orientations designed to
match existing products available
Applications
• Telecommunications
• Fiber in the Loop
• Inter/lntra Office
• SONET/SDH
• Datacommunications
• Switches
on the market. We also offer a
comprehensive range of alterna-
tive mounting flanges.
If the specific arrangement or
performance you require is not
listed, please contact your local
representative as our highly
flexible design and manufacturing
processes allow both physical and
electro-optical customisation to
meet your needs.
Laser Safety Warning
This device is a Class Illb (3b) Laser Product. It may emit invisible laser radiation if
operated with the fiber pigtail disconnected.
To avoid possible eye damage do not look into an unconnected fiber pigtail during
laser operation. Do not exceed specified operating limits.
2
Absolute Maximum Ratings
Absolute maximum limits mean that no catastrophic damage will occur if the product is subjected to these ratings for short periods, provided each
limiting parameter is in isolation and all other parameters have values within the performance specification. It should not be assumed that limiting
values of more than one parameter can be applied to the product at the same time.
Parameter
Laser Forward Current
Laser Reverse Current
Laser Reverse Voltage
Photodiode Reverse Voltage
Photodiode Forward Current
Operating Temperature
Storage Temperature
Relative Humidity
Fiber Pull Strength
Mechanical Shock
Vibration
Symbol Conditions
If
Ir
Vlr
Vr
Ipf
Tc
Ts
RH
DC
DC
DC
DC
DC
Pf = 200
µW
Limits
Min
Max
–
–
–
–
–
-40
-40
0.0
–
150
100
2
10
1
+85
+85
non-
condensing
10
Units
mA
µA
V
V
mA
°C
°C
%RH
N
Mil Std 883D, Method 2002,
Condition B
Mil Std 883D, Method 2007,
Condition A
Performance Specifications
Parameter
LASER
Threshold Current
Peak Optical Output Power
Optical Output Power
Drive Current above Ith
Slope Efficiency
Forward Voltage
Centre Wavelength
Temp. Dependence of
λc
Linewidth
Rise Time
Fall Time
Small Signal Freq. Response
Ith
Pf
Pth
Id
η
Vf
λc
∆λc/∆T
∆λ
τr
τf
Bw
Symbol Conditions
CW, Tc = 25°C, Pf = 200
µW
unless otherwise stated
5
200
–
10
8
–
1280
–
–
–
–
1.0
25
–
10
25
20
1.8
1330
0.4
2.5
0.5
0.5
–
mA
µW
µW
mA
µW/mA
V
nm
nm/°C
nm
ns
ns
GHz
Limits
Min
Max
Units
Pth = Pf @ Ith - 2 mA
Pf = 200
µW
Note 1
Tc = -40°C to +85°C
1xσ, RMS, Note 1
10% to 90%: Ith to Pf = 200
µW
90% to 10%: Pf = 200
µW
to Ith
Note:
1. Modulated measurements also available.
3
Performance Specifications (cont'd.)
Parameter
MONITOR PHOTODIODE
Symbol
Test Conditions
Tc = 25°C, Vr = 5 V (Note 2),
Pf = 200
µW
unless otherwise stated
lm
R
Id
C
∆R
τr
τf
200
1.0
–
–
–
–
–
1000
5.0
20
10
±
1.0
2.0
2.0
µA
A/W
nA
pF
dB
ns
ns
Limits
Min
Max
Units
Photocurrent
Responsivity
Dark Current
Capacitance
Tracking Error
Rise Time
Fall Time
Note:
Pf = 0
µW
1 MHz
Im = Im @ (Pf = 200
µW,
Tc = 25°C)
Tc = -40° to +85°C
10% to 90%: Ith to Pf = 200
µW
90% to 10%: Pf = 200
µW
to Ith
2. Photodiode will also operate under zero bias conditions.
Fiber Pigtail:
Tight jacketed, self-mode stripping, single mode fiber
Parameter
Length
Spot Size (Mode Radius)
Cladding Diameter
Core/Cladding Concentricity
Secondary Jacket Diameter
Effective Cutoff Wavelength
Min
1.0
4.5
122
–
0.8
1150
Max
–
5.5
128
1.0
1.0
1240
Unit
m
µm
µm
µm
mm
nm
5
Ordering Information
The following details how to define the part number correctly for the LST262X family of coaxial pigtailed
lasers. Electro-optic parameter limits are as defined on previous pages for all options.
LST262X-X-XX
Connector Type:
FP = FC/PC
ST = ST
®
SC = SC
DN = DIN
BI = Biconic
D4 = D4
SF = Superpolish FC/PC
Flange Type:
B - Without mounting flange
D - 2 hole PCB mount, 12.7 mm between centers
E - 2 hole panel mount, 12 mm between centers
Pin Outs – See Drawings:
5 = 2 mm PCD
6 = 2.54 mm PCD
7 = 2 mm PCD
8 = 2.54 mm PCD
Allowed Model Names:
LST2625-D
LST-2626-D
LST2627-E
LST2628-E
LST262*-B (No flange)
CDRH Certification
Laser Warning
10
b Laser Product
ST
®
is a Registered Trademark of AT&T.
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