Product Bulletin
50 mW 1550 nm CW DFB
Lasers with PM Fiber for
WDM Applications
CQF935/808 Series
The JDS Uniphase CQF935/808 series laser is
specifically developed for wavelength division
multiplexing (WDM) systems, where it is used as a
wavelength selected source in combination with an
external modulator, such as the LiNbO3-based
Mach-Zehnder.
Selected wavelengths comply with ITU recommen-
dations, both in range (1527.61 to 1610.06 nm)
and in channel definition, thus adhering to the 100
GHz grid (0.8 nm) relative to a frequency of 193.1
THz (i.e., a wavelength of 1552.52 nm). It is
possible to customize the wavelength spacing to a
50 GHz grid (0.4 nm).
Each laser's wavelength is accurately measured,
and the laser itself is accompanied by a datasheet
with the laser performance at the temperature T,
where the required wavelength channel is reached.
The CQF935/808 shows high side mode suppres-
sion ratios, very low relative intensity noise, and
small linewidths. It is available in a standard 14-
pin butterfly package equipped with a polarization
maintaining fiber to facilitate coupling to the
modulator, and shows superb thermal stability.
Key Features
•
1550 nm WDM distributed feedback laser diode
•
High power (> 50 mW)
•
Polarization maintaining fiber
•
Built-in thermoelectric cooler
•
Cooled, built-in optical isolator
•
1527 - 1610 nm wavelength range
•
0.8 nm (100 GHz) spacing
•
0.4 nm (50 GHz) spacing optional
Applications
•
Hybrid fiber-coax (HFC) networks, cable-
television (CATV) networks and metro architec-
tures where high power, low RIN, and narrow
linewidths are required
•
Long haul for compensation of high-loss passive
or active components
CQF935/808 Series | 2
Specifications
Limiting Values
Parameter
Laser Diode
Radiant output power from pigtail
Reverse voltage
Forward current
Monitor Diode
Reverse voltage
Forward current
Module
Storage temperature range
Case operating temperature range
Fiber Pigtail
Bending radius
Tensile strength fiber to case
Symbol
P
peak
V
R
I
F
V
R
I
F
T
stg
T
op
R
F
Conditions
-
-
-
-
-
(note
1
)
Cooler active
-
(note
1
)
Min
-
-
-
-
-
-40
0
35
-
Min
50
-
-
1527
20
-
30
30
-
-
-
0.07
5
-
-
9.5
3800
-
-
9.5
122
380
0.8
0.9
18
1
-
Typ
-
Max
100
2.0
600
20
10
85
65
-
5
Max
-
450
40
1610
35
2.5
-
-
-160
1
0.001
0.12
150
0.1
10
10.5
4100
1.5
4.0
11.5
128
420
1.0
-
-
-
-
Unit
mW
V
mA
V
mA
°C
°C
mm
N
Unit
mW
mA
mA
nm
°C
V
dB
dB
dB/Hz
MHz
nm/°C
nm/°C
µA/mW
µA
%
kΩ
K
A
V
µm
µm
µm
mm
m
dB
m
years
Characteristics
(T
chip
= T
λ
, T
amb
≅
25 °C, P
O
= 50 mW unless otherwise specified)
Parameter
Symbol Conditions
Radiant output power from pigtail
Operating current
Laser Diode
Threshold current
Central wavelength (ITU grid)
Laser set temperature for
λ
c
Forward voltage
Side mode suppression ratio
Optical isolation
Relative intensity noise
Spectral linewidth
Wavelength drift with case temp.
Wavelength temperature tunability
Monitor Diode
(V
R
= 10 V)
Monitor diode responsivity
Dark current
Temperature tracking error
Thermistor
Resistance
Thermistor constant
Thermoelectric Cooler
(∆Τ
= 45
°C)
Cooler current
Cooler voltage
P
O
I
op
I
th
λ
c
T
λ
V
F
SMSR
ISO
RIN
∆λ
-
-
R
I
md
TE
R
th
B
I
cool
V
cool
20
°C
< T
λ
< 35
°C
-
-
-
-
-
-
-
20 - 1000 MHz
FWHM
0 °C < T
case
< 65 °C
20 °C < T
λ
< 35 °C
-
-
0
°C
< T
case
< 65
°C
T
th
= 25 °C
-
-
-
-
-
-
-
-
E-field along slow axis
-
EOL:
∆λ
= 0.2 nm
25
-
-
-
45
35
-
-
-
-
-
-
-
10
-
-
-
-
-
-
-
-
20
-
300
Polarization Maintaining Fiber Pigtail
(note
2
)
Mode field diameter
Ø
mf
Cladding diameter
Ø
cl
Diameter of secondary coating
Diameter of loose tube
Length of loose tube
Polarization extinction ratio
Length of pigtail
Reliability
Long term wavelength drift (note
1
)
ML = Median Life, EOL = End Of Life.
2. Fujikura SM.15-P-8/125-UV/UV 400 PANDA or equivalent
Ø
sc
Ø
LT
l
LT
ER
-
ML
λ
1. Mechanical integrity/environmental endurance tested according to Telcordia GR-468-CORE and MIL-STD-883
CQF935/808 Series | 3
Typical Performance Characteristics
90
Relative Intensity (nm)
80
Output Power (mW)
0
-10
-20
-30
-40
-50
-60
-70
1545
1550
1555
Wavelength (nm)
1560
1565
Wavelength: 1555.75 nm
o
P
o
=50 mW T
chip
=33.5 C
70
60
50
40
30
20
10
0
0
100
200
300
400
500
Operating Current (mA)
CQF935/808
o
T
chip
=33.5 C
Typical L-I curve for the CQF935. Each laser is character-
ized at the temperature for which the specified wavelength
channel
λ
c
is reached.
The use of multi-quantum well technology results in
excellent side mode suppression ratios and small
linewidths. The inset shows how the wavelength is speci-
fied on each datasheet.
Relative Intensity Noise (dB/Hz)
0
-3
Power (dB)
-150
-155
-160
-165
-170
-175
-180
0
200
400
600
800
1000
Frequency (MHz)
-6
-9
-12
-15
-18
-21
57
58
59
60
MHz
61
62
63
Linewidth at -3 dB is better than 1 MHz.
Relative intensity noise is better than -160 dB/Hz.
Dimensions Diagram
(Specifications in mm [inches] unless otherwise noted; tolerance = ±0.15 [±0.006])
Pinout
1 Thermistor
2 Thermistor
3 LD cathode DC input via
inductance
4 PD anode
5 PD cathode
6 Cooler anode
7 Cooler cathode
8 Case GND
9 Case GND
10 Not connected
11 LD anode, case
12 LD cathode, AC input
13 LD anode, case
14 Not connected
CQF935/808 Series | 4
Ordering Information
For more information on this or other products and their availability, please contact your local JDS Uniphase account manager or
JDS Uniphase directly at 1-800-498-JDSU (5378) in North America and +800-5378-JDSU worldwide or via e-mail at
sales@jdsu.com.
Sample: CQF935/808-19270 for wavelength 1555.75 nm.
Attention:
Order confirmations on this part number are preceeded by FG’ (e.g., FG’CQF935/808-19270).
CQF935/808-
JDSU
Channel
Code
19630
19620
19610
19600
19590
19580
19570
19560
19550
19540
19530
19520
19510
19500
19490
19480
19470
19460
19450
19440
19430
19420
19410
19400
19390
19380
19370
19360
19350
19340
19330
19320
19310
19300
Optical
Frequency
f
c
(THz)
196.30
196.20
196.10
196.00
195.90
195.80
195.70
195.60
195.50
195.40
195.30
195.20
195.10
195.00
194.90
194.80
194.70
194.60
194.50
194.40
194.30
194.20
194.10
194.00
193.90
193.80
193.70
193.60
193.50
193.40
193.30
193.20
193.10
193.00
Wavelength
(vacuum)
λ
c
(nm)
1527.22
1527.99
1528.77
1529.55
1530.33
1531.12
1531.90
1532.68
1533.47
1534.25
1535.04
1535.82
1536.61
1537.40
1538.19
1538.98
1539.77
1540.56
1541.35
1542.14
1542.94
1543.73
1544.53
1545.32
1546.12
1546.92
1547.72
1548.51
1549.32
1550.12
1550.92
1551.72
1552.52
1553.33
JDSU
Channel
Code
19290
19280
19270
19260
19250
19240
19230
19220
19210
19200
19190
19180
19170
19160
19150
19140
19130
19120
19110
19100
19090
19080
19070
19060
19050
19040
19030
19020
19010
19000
18990
18980
18970
18960
Optical
Frequency
f
c
(THz)
192.90
192.80
192.70
192.60
192.50
192.40
192.30
192.20
192.10
192.00
191.90
191.80
191.70
191.60
191.50
191.40
191.30
191.20
191.10
191.00
190.90
190.80
190.70
190.60
190.50
190.40
190.30
190.20
190.10
190.00
189.90
189.80
189.70
189.60
Wavelength
(vacuum)
λ
c
(nm)
1554.13
1554.94
1555.75
1556.56
1557.36
1558.17
1558.98
1559.79
1560.61
1561.42
1562.23
1563.05
1563.86
1564.68
1565.50
1566.31
1567.13
1567.95
1568.77
1569.59
1570.42
1571.24
1572.06
1572.89
1573.71
1574.54
1575.37
1576.20
1577.03
1577.86
1578.69
1579.52
1580.35
1581.18
JDSU
Channel
Code
18950
18940
18930
18920
18910
18900
18890
18880
18870
18860
18850
18840
18830
18820
18810
18800
18790
18780
18770
18760
18750
18740
18730
18720
18710
18700
18690
18680
18670
18660
18650
18640
18630
18620
Optical
Frequency
f
c
(THz)
189.50
189.40
189.30
189.20
189.10
189.00
188.90
188.80
188.70
188.60
188.50
188.40
188.30
188.20
188.10
188.00
187.90
187.80
187.70
187.60
187.50
187.40
187.30
187.20
187.10
187.00
186.90
186.80
186.70
186.60
186.50
186.40
186.30
186.20
Wavelength
(vacuum)
λ
c
(nm)
1582.02
1582.85
1583.69
1584.53
1585.36
1586.20
1587.04
1587.88
1588.73
1589.57
1590.41
1591.26
1592.10
1592.95
1593.79
1594.64
1595.49
1596.34
1597.19
1598.04
1598.89
1599.75
1600.60
1601.46
1602.31
1603.17
1604.03
1604.88
1605.74
1606.61
1607.47
1608.33
1609.19
1610.06
Fiber Termination: Default 1.25 mm or 2.5 mm ferrule
PANDA is a trademark of Fujikura Ltd.
Telcordia is a trademark of Telcordia Technologies Incorporated.
North America toll-free: 1-800-498-JDSU (5378)
Worldwide toll-free: +800-5378-JDSU
www.jdsu.com
All statements, technical information and recommendations related to the products herein are based upon information
believed to be reliable or accurate. However, the accuracy or completeness thereof is not guaranteed, and no responsibility is
assumed for any inaccuracies. The user assumes all risks and liability whatsoever in connection with the use of a product or its
application. JDS Uniphase reserves the right to change at any time without notice the design, specifications, function, fit or
form of its products described herein, including withdrawal at any time of a product offered for sale herein. JDS Uniphase
makes no representations that the products herein are free from any intellectual property claims of others. Please contact JDS
Uniphase for more information. JDS Uniphase and the JDS Uniphase logo are trademarks of JDS Uniphase Corporation. Other
trademarks are the property of their respective holders. Copyright JDS Uniphase Corporation. All rights reserved.
10143087 Rev. 001 01/04
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