PRELIMINARY DATA SHEET
LASER DIODE
NX8508 Series
1 470 TO 1 610 nm InGaAsP MQW-DFB LASER DIODE
COAXIAL MODULE FOR 2.5 Gb/s, CWDM
DESCRIPTION
The NX8508 Series is a 1 470 to 1 610 nm Multiple Quantum Well (MQW)
structured Distributed Feed-Back (DFB) laser diode coaxial module with an
internal optical isolator.
These devices are ideal for 2.5 Gb/s CWDM application.
FEATURES
• Internal optical isolator
• Peak emission wavelength
• Optical output power
• Operating case temperature range
• Side mode suppression ratio
• InGaAs monitor PIN-PD
• With SC-UPC connector
• Based on Telcordia reliability
λ
p
= 1 470 to 1 610 nm (Based on CWDM)
P
f
= 2.0 mW
T
C
=
−20
to +85°C
SMSR = 40 dB
The information in this document is subject to change without notice. Before using this document, please confirm that
this is the latest version.
Not all devices/types available in every country. Please check with local NEC Compound Semiconductor Devices
representative for availability and additional information.
Document No. PL10433EJ03V0DS (3rd edition)
Date Published March 2004 CP(K)
Printed in Japan
The mark
shows major revised points.
NEC Compound Semiconductor Devices 2003, 2004
NX8508 Series
PACKAGE DIMENSIONS (UNIT : mm)
NX8508BMxx
*1
-CC
Optical Fiber (SMF)
With SC Connector
NX8508CGxx
*1
-CC
Optical Fiber (SMF)
With SC Connector
φ
0.9
φ
0.9
6.0
6.0
7.3
φ
7.0±0.2
φ
7.0±0.2
27.6±1.0
8.0±0.3
20.4±1.0
8.0±0.3
4.0±0.2
φ
0.45±0.05
12.7±0.2
17.0±0.2
φ
0.45±0.05
16.0
PIN CONNECTIONS
P.C.D. =
φ
2.0
PIN CONNECTIONS
PD
P.C.D. =
φ
2.0
4–R1.25±0.2
2
3
4
1
19.5±1.0
PD
2
1
3
4
LD
Case
1.2±0.2
1.0±0.1
7.2±0.3
4
1
3
2
1
LD
2
Case
2–
φ
2.5
3.7±0.3
8.5±0.2
12.0±0.15
*1
Please refer to
ORDERING INFORMATION.
OPTICAL FIBER CHARACTERISTICS
Parameter
Mode Field Diameter
Cladding Diameter
Maximum Cladding Noncircularity
Maximum Core/Cladding Concentricity
Outer Diameter
Cut-off Wavelength
Minimum Fiber Bending Radius
Fiber Length
Flammability
Specification
9.5±1
125±2
2
1.6
0.9±0.1
1 100 to 1 270
30
1 000±100
UL1581 VW-1
Unit
µ
m
µ
m
%
%
mm
nm
mm
mm
35±2 mm
7.0±0.2
4
3
0.5
φ
2.2
20.0±1.0
0.5±0.2
2.2
3.2
28.3±1.0
15.0
SC-UPC Connector
Fiber Length:
1 000±100
mm
2
Preliminary Data Sheet PL10433EJ03V0DS
8.99±0.5 mm
NX8508 Series
ORDERING INFORMATION
Part Number
NX8508BMxx-CC
NX8508CGxx-CC
Flange Type
Flat Mount Flange
Vertical Mount Flange
Available Connector
With SC-UPC Connector
NX8508
xx-CC
Connector code
: With SC-UPC connector
Wavelength code : Refer to
Table A
Package code
: Refer to
PACKAGE DIMENSIONS
ABSOLUTE MAXIMUM RATINGS
Parameter
Optical Output Power from Fiber
Forward Current of LD
Reverse Voltage of LD
Forward Current of PD
Reverse Voltage of PD
Operating Case Temperature
Storage Temperature
Lead Soldering Temperature
Relative Humidity (noncondensing)
Symbol
P
f
I
F
V
R
I
F
V
R
T
C
T
stg
T
sld
RH
Ratings
5
150
2.0
2.0
15
−20
to +85
−40
to +85
350 (3 sec.)
85
Unit
mW
mA
V
mA
V
°C
°C
°C
%
Preliminary Data Sheet PL10433EJ03V0DS
3
NX8508 Series
ELECTRO-OPTICAL CHARACTERISTICS (T
C
=
−20
to +85°C, unless otherwise specified)
Parameter
Optical Output Power from Fiber
Operating Voltage
Threshold Current
Symbol
P
f
V
op
I
th
Conditions
CW, T
C
= 25°C, I
F
= I
th
+ 20 mA
CW, P
f
= 2.0 mW
T
C
= 25°C
MIN.
TYP.
2.0
1.1
10
1.6
20
50
Differential Efficiency
MAX.
Unit
mW
V
mA
η
d
P
f
= 2.0 mW, T
C
= 25°C
P
f
= 2.0 mW
0.07
0.04
λ
p
−2
0.08
0.1
W/A
Peak Emission Wavelength
Temperature Dependence of Peak
Emission Wavelength
Side Mode Suppression Ratio
Rise Time
Fall Time
Monitor Current
Monitor Dark Current
λ
p
CW, P
f
= 2.0 mW, T
C
= 35°C
CW
λ
p
*1
λ
p
+2
0.12
nm
nm/°C
∆
λ/
∆
T
SMSR
t
r
t
f
I
m
I
D
0.10
P
f
= 2.0 mW
20-80%, P
f
= 2.0 mW
80-20%, P
f
= 2.0 mW
V
R
= 1.5 V, P
f
= 1.0 mW
V
R
= 1.5 V, T
C
= 25°C
V
R
= 1.5 V
30
40
100
150
dB
ps
ps
100
500
0.1
10
1 000
10
100
1.0
µ
A
nA
Tracking Error
*2
γ
I
m
= const.
−1.0
dB
*1
Available Available for CWDM Wavelengths based on ITU-T recommendations
λ
p
= 1 470, 1 490, 1 510, 1 530, 1 550, 1 570, 1 590, 1 610 nm
Please refer to
Table A.
Table A: CWDM wavelength code (@ T
C
= 35°C)
Wavelength Code
47
49
51
53
55
57
59
61
MIN. (nm)
1 468
1 488
1 508
1 528
1 548
1 568
1 588
1 608
TYP. (nm)
1 470
1 490
1 510
1 530
1 550
1 570
1 590
1 610
MAX. (nm)
1 472
1 492
1 512
1 532
1 552
1 572
1 592
1 612
4
Preliminary Data Sheet PL10433EJ03V0DS
NX8508 Series
*2
Tracking Error:
γ
P
f
(mW)
T
C
= 25˚C
2.0
T
C
= –20 to +85˚C
P
f
γ
= 10 log
P
f
2.0
[dB]
0
I
m
I
m
(mA)
Preliminary Data Sheet PL10433EJ03V0DS
5
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