FOS

79800F
Series

WDM DFB
Fiber Optic
Source Modules

Specifications

FOS

Product Features

79800F Series WDM DFB Fiber Optic Source Modules

Center wavelengths
from 1475–1625 nm

SS-810 Source Shutter

Wavelength
Available Center Wavelength:
Spectral Width
Coherence Control OFF:
Coherence Control ON:
Wavelength Accuracy:1
Wavelength Tuning Range:
Wavelength Setting Resolution:
Wavelength Stability2
Short Term (15 minutes):Long Term (24 hours):

Transition TimeOff to On:
On to Off:Power Stability 24 hr. 25 ±1°C:
Power Stability 15 min. 25 ±0.1°C:
Repeatability:
Lifetime:(see table)<30MHz1GHz (typical)±25pm±0.85nm1pm(see table)
±3pm
±5pm

Optical Connector:7
Operating Temperature:
Humidity:(see table)

24 hours:
Power Attenuation Range:
Attenuation Accuracy:4
Optical Isolation:
RIN:5
Side Mode Supression Ratio:
Signal-to-Peak Background Ratio:6

1 pm resolution

FC/APC
15°C - 35°C
<80% RH, non-condensing

Output power stability<0.005 dB rms

GeneralOutput Power
Output Power:3
Output Power Stability2,815 minute (spec):

30ms
10ms
<0.07dB<0.005rms±0.05dB>10 million cycles

Notes
1 ±25 pm for 90 days following factory or user calibration; ±50 pm for one year
2 After one-hour warm-up (typical). Some modules may require longer warm-up time.
For short-term stability, assume ambient temperature constant within ±0.1°C. For
long-term stability, assume ambient temperature constant within ±1°C.
3 User-specified maximum power level.
4 Defined as: ∆Pmeas–∆Pset from maximum power to 5dB down.
5 ±100nm about center wavelength.
6 Measured at output connector. Use angled connector patchcords to minimize noise.
7 Other connector types available. Some specifications may be degraded.
8 79800F/SERV requires warm-up of up to six hours.

<0.005dB rms(0.002 dB rms typical)±0.03dB
Full Power to 0dBm
±0.1dB>30dB-145dB/Hz>40dB (>45dB typical)>30dB

MAXIMUM
POWER LEVEL2,8

MODULECENTER WAVELENGTH

79800F/315C1

1527.98–1564.26nm (C-band)

9–10mW

79800F/315L1

1564.27–1610nm (L-band)

9–10mW

79800F/315C2

1527.98–1564.26nm (C-band)>10 up to 20mW

79800F/315L2

1564.27–1610nm (L-band)>10 up to 20mW
9–20mW

79800F/315S

1475–1527.97nm (S-band)

79800F/315EL

1610.01–1625nm (Extended L-band)

9–20mW

79800F/SERV

1310, 1480, 1510, 1625 ±5nm
(Service Channels)

9–20mW

Maximum output power
range 9–20 mW

Output wavelength stability±3 pm
Coherence control for SBS
suppression and power stability

For your most demanding WDM system and component
test applications, ILX Lightwave proudly offers the
FOS-79800F Series WDM DFB Fiber Optic Source Modules.
This fourth generation source module platform brings
unparalleled reliability to your test systems. Choose maximum
calibrated power levels, from 9–20 mW. Select center
wavelengths from 1475–1625 nm on ITU grid points or atyour custom specification. These modules offer an impressive
list of features: picometer resolution, high power, exceptional
stability, coherence control, optional source shutter, optional
PM alignment and accurate attenuation.
When installed in the FOM-7900B Fiber Optic System
Mainframe, FOS-79800F Series WDM DFB Fiber Optic Source
Modules are easily controlled through simple front panel menu
entries, or through a full featured GPIB remote interface.
Mainframe trigger capabilities allow you to easily synchronize
output modulation of multiple modules.

PM Alignment
Also available:

PM connector aligned to slow
axis of fiber

SSE50 Optional Spontaneous Emission Specification
Signal/Spontaneous Emission:>50dB (within ±100nm
of center wavelength)

Ordering Information
FOM-7900B
FOS-79800F/315C1
FOS-79800F/315L1
FOS-79800F/315C2
FOS-79800F/315L2
FOS-79800F/315S
FOS-79800F/315EL
FOS-79800F/SERV
FOS-79800F/000
FOS-79710
DPM-79810
SS-810
SSE50
PM Alignment

System Mainframe with eight bay capacity (Includes GPIB interface)
WDM DFB 9-10mW Source Module (1527.98-1564.26nm user-specified wavelength)
WDM DFB 9-10mW Source Module (1564.27-1610.06nm user-specified wavelength)
WDM DFB 10-20mW Source Module (1527.98-1564.26nm user-specified wavelength)
WDM DFB 10-20mW Source Module (1564.26-1610nm user-specified wavelength)
WDM DFB 9-20mW Source Module (1475-1527.97nm user-specified wavelength)
WDM DFB 9-20mW Source Module (1610.01-1625nm user-specified wavelength)
WDM DFB 9-20mW Source Module (1310, 1480, 1510, and 1625 ± 5nm user-specified wavelength)
Special Product for non-standard wavelength
1 x 4 Fiber Optic Switch Module
Dual Power Meter Module
Source Shutter Option (not compatible with PM alignment)
50dB Ratio of Signal to Spontaneous Emission Option
Per Channel PM Alignment

The Standard for Fiber Optic Sources
For information call
P.O. Box 6310 Bozeman, MT 59771 FAX: 406-586-9405

www.ilxlightwave.com

1-800-459-9459
International Inquiries: 406-586-1244

email: sales@ilxlightwave.com
Rev01.3/28/06

79800F
Series

WDM DFB
Fiber Optic
Source Modules

FOS

79800F
Series

WDM DFB
Fiber Optic
Source Modules

Solutions for Multi-Wavelength
Test Applications

Coherence Control for a Stable
Test System

Dependable long-term performance is thetrademark of the FOS-79800 Series Fiber Optic
Source Modules, even in the most exacting
laboratory and production environments. Together
with the FOM-7900B Modular Fiber Optic System,
they deliver the most effective multi-wavelength
test solution for both active and passive WDM
components and systems.

In narrow linewidth fiber optic test systems,
reflections from connectors and the effectsof etalons can degrade source stability andcause measurement instability. In higher power
applications, Stimulated Brillouin Scattering
worsens this problem by providing narrow-band
gain for light traveling back to the source. For
these reasons, controlling DFB source spectral
linewidth is critical.
Coherence control of the FOS-79800F
modules broadens laser linewidth from 30 MHz to
1 GHz. This reduces spectral power density anddecreases coherence length from several meters
to around 20 cm. The final result is remarkably
stable sources for solid measurements.

Standard features include dual stage
temperature control, ILX’s proprietary low noise
laser current control technology, closed loop
constant power operation and redundant current
limits. The FOS-79800F Series Source Modules
provide the performance and reliability required foryour most demanding fiber optic testing needs.

79800F
SeriesThe perfect fiber optic source solution, now withpicometer resolution and extended wavelengths.
Calibrated Attenuation for Accurate
Channel Equalization

The FOS-79800F modules feature a processorcontrolled modulation mode that supplies 100%
depth, 50% duty cycle modulation drive current. All
active modules can be modulated synchronously
at any frequency from 1–500 kHz. This is ideal
for measuring EDFA spontaneous emission
background level by the time domain extinction
testing method.

For gain flatness testing with accurate
attenuator-like performance, the FOS-79800F
modules feature high resolution attenuation so you
can easily equalize channel levels. Attenuation isaccurate within ±0.1 dB while maintaining otherspecifications from maximum power to 5 dB
down. If speed is critical to your application, theavailable SS-810 source shutter blocks the outputof the modules without turning off the current to
the lasers. This significantly reduces time spent
waiting for the output to settle.

Precise control of laser diode temperature and current
densities ensures a stable wavelength.

Industry leading fiber optic source power attenuation
accuracy.

Normal and inverted TTL-level outputs
provide flexible triggering for data acquisition
instruments, simplifying test setup. In addition, arear panel modulation input synchronizes multiple
mainframes, and allows synchronization of thesystem with an external instrument.

Reliability Built on Industry
Leading Experience

Synchronous 100% Modulation for
EDFA Test
Coherence control of narrow linewidth sources will
minimize instabilities caused by reflections in single
mode fiber.

FOS

Sophisticated Module Control
Each FOS-79800F module can be controlled
independently through an intuitive menu on the
FOM-7900B System mainframe front panel, or
remotely through RS-232 or GPIB IEEE-488.2.
Easy-to-understand commands allow full controlof wavelength, output power, calibration, andmodulation functions. Banked remote capability
provides control of up to two hundred sourcechannels from a single GPIB address.
The FOS-79800F modules save time byallowing quick and easy configuration of eachapplication. For example, all modules can becontrolled by one “Channel All” function.

For over 15 years ILX Lightwave has worked
closely with laser diode manufacturers developing
instrumentation and providing solutions.

Introduced in 1996, the FOM-7900 Fiber
Optic Test System with Modular Sources wasbuilt on our laser diode control experience,bringing the first modular source system to EDFA
manufacturers. This third generation platform willbring unparalleled experience and reliability toyour test system.

We Understand That Component
Testing Throughput is Critical
Ask us about edge testing and other innovative
solutions for testing your passive components.
If you have special requirements such as
higher power, special selected wavelengths,
or customization with your lasers, call us. Our
technically qualified sales engineers can help you
define the custom fiber optic source configuration
for your testing needs.

FOS-79800F Fiver Optic Source short term stability is±0.005 dB.

WDM DFB
Fiber Optic
Source Modules

FOS

79800F
Series

WDM DFB
Fiber Optic
Source Modules

Solutions for Multi-Wavelength
Test Applications

Coherence Control for a Stable
Test System

Dependable long-term performance is thetrademark of the FOS-79800 Series Fiber Optic
Source Modules, even in the most exacting
laboratory and production environments. Together
with the FOM-7900B Modular Fiber Optic System,
they deliver the most effective multi-wavelength
test solution for both active and passive WDM
components and systems.

In narrow linewidth fiber optic test systems,
reflections from connectors and the effectsof etalons can degrade source stability andcause measurement instability. In higher power
applications, Stimulated Brillouin Scattering
worsens this problem by providing narrow-band
gain for light traveling back to the source. For
these reasons, controlling DFB source spectral
linewidth is critical.
Coherence control of the FOS-79800F
modules broadens laser linewidth from 30 MHz to
1 GHz. This reduces spectral power density anddecreases coherence length from several meters
to around 20 cm. The final result is remarkably
stable sources for solid measurements.

Standard features include dual stage
temperature control, ILX’s proprietary low noise
laser current control technology, closed loop
constant power operation and redundant current
limits. The FOS-79800F Series Source Modules
provide the performance and reliability required foryour most demanding fiber optic testing needs.

79800F
SeriesThe perfect fiber optic source solution, now withpicometer resolution and extended wavelengths.
Calibrated Attenuation for Accurate
Channel Equalization

The FOS-79800F modules feature a processorcontrolled modulation mode that supplies 100%
depth, 50% duty cycle modulation drive current. All
active modules can be modulated synchronously
at any frequency from 1–500 kHz. This is ideal
for measuring EDFA spontaneous emission
background level by the time domain extinction
testing method.

For gain flatness testing with accurate
attenuator-like performance, the FOS-79800F
modules feature high resolution attenuation so you
can easily equalize channel levels. Attenuation isaccurate within ±0.1 dB while maintaining otherspecifications from maximum power to 5 dB
down. If speed is critical to your application, theavailable SS-810 source shutter blocks the outputof the modules without turning off the current to
the lasers. This significantly reduces time spent
waiting for the output to settle.

Precise control of laser diode temperature and current
densities ensures a stable wavelength.

Industry leading fiber optic source power attenuation
accuracy.

Normal and inverted TTL-level outputs
provide flexible triggering for data acquisition
instruments, simplifying test setup. In addition, arear panel modulation input synchronizes multiple
mainframes, and allows synchronization of thesystem with an external instrument.

Reliability Built on Industry
Leading Experience

Synchronous 100% Modulation for
EDFA Test
Coherence control of narrow linewidth sources will
minimize instabilities caused by reflections in single
mode fiber.

FOS

Sophisticated Module Control
Each FOS-79800F module can be controlled
independently through an intuitive menu on the
FOM-7900B System mainframe front panel, or
remotely through RS-232 or GPIB IEEE-488.2.
Easy-to-understand commands allow full controlof wavelength, output power, calibration, andmodulation functions. Banked remote capability
provides control of up to two hundred sourcechannels from a single GPIB address.
The FOS-79800F modules save time byallowing quick and easy configuration of eachapplication. For example, all modules can becontrolled by one “Channel All” function.

For over 15 years ILX Lightwave has worked
closely with laser diode manufacturers developing
instrumentation and providing solutions.

Introduced in 1996, the FOM-7900 Fiber
Optic Test System with Modular Sources wasbuilt on our laser diode control experience,bringing the first modular source system to EDFA
manufacturers. This third generation platform willbring unparalleled experience and reliability toyour test system.

We Understand That Component
Testing Throughput is Critical
Ask us about edge testing and other innovative
solutions for testing your passive components.
If you have special requirements such as
higher power, special selected wavelengths,
or customization with your lasers, call us. Our
technically qualified sales engineers can help you
define the custom fiber optic source configuration
for your testing needs.

FOS-79800F Fiver Optic Source short term stability is±0.005 dB.

WDM DFB
Fiber Optic
Source Modules

FOS

79800F
Series

WDM DFB
Fiber Optic
Source Modules

Specifications

FOS

Product Features

79800F Series WDM DFB Fiber Optic Source Modules

Center wavelengths
from 1475–1625 nm

SS-810 Source Shutter

Wavelength
Available Center Wavelength:
Spectral Width
Coherence Control OFF:
Coherence Control ON:
Wavelength Accuracy:1
Wavelength Tuning Range:
Wavelength Setting Resolution:
Wavelength Stability2
Short Term (15 minutes):Long Term (24 hours):

Transition TimeOff to On:
On to Off:Power Stability 24 hr. 25 ±1°C:
Power Stability 15 min. 25 ±0.1°C:
Repeatability:
Lifetime:(see table)<30MHz1GHz (typical)±25pm±0.85nm1pm(see table)
±3pm
±5pm

Optical Connector:7
Operating Temperature:
Humidity:(see table)

24 hours:
Power Attenuation Range:
Attenuation Accuracy:4
Optical Isolation:
RIN:5
Side Mode Supression Ratio:
Signal-to-Peak Background Ratio:6

1 pm resolution

FC/APC
15°C - 35°C
<80% RH, non-condensing

Output power stability<0.005 dB rms

GeneralOutput Power
Output Power:3
Output Power Stability2,815 minute (spec):

30ms
10ms
<0.07dB<0.005rms±0.05dB>10 million cycles

Notes
1 ±25 pm for 90 days following factory or user calibration; ±50 pm for one year
2 After one-hour warm-up (typical). Some modules may require longer warm-up time.
For short-term stability, assume ambient temperature constant within ±0.1°C. For
long-term stability, assume ambient temperature constant within ±1°C.
3 User-specified maximum power level.
4 Defined as: ∆Pmeas–∆Pset from maximum power to 5dB down.
5 ±100nm about center wavelength.
6 Measured at output connector. Use angled connector patchcords to minimize noise.
7 Other connector types available. Some specifications may be degraded.
8 79800F/SERV requires warm-up of up to six hours.

<0.005dB rms(0.002 dB rms typical)±0.03dB
Full Power to 0dBm
±0.1dB>30dB-145dB/Hz>40dB (>45dB typical)>30dB

MODULECENTER WAVELENGTH

MAXIMUM
POWER LEVEL2,879800F/315C1

1527.98–1564.26nm (C-band)

9–10mW

79800F/315L1

1564.27–1610nm (L-band)

9–10mW

79800F/315C2

1527.98–1564.26nm (C-band)>10 up to 20mW

79800F/315L2

1564.27–1610nm (L-band)>10 up to 20mW

79800F/315S

1475–1527.97nm (S-band)

9–20mW

79800F/315EL

1610.01–1625nm (Extended L-band)

9–20mW

79800F/SERV

1310, 1480, 1510, 1625 ±5nm
(Service Channels)

9–20mW

Maximum output power
range 9–20 mW

Output wavelength stability±3 pm
Coherence control for SBS
suppression and power stability

For your most demanding WDM system and component
test applications, ILX Lightwave proudly offers the
FOS-79800F Series WDM DFB Fiber Optic Source Modules.
This fourth generation source module platform brings
unparalleled reliability to your test systems. Choose maximum
calibrated power levels, from 9–20 mW. Select center
wavelengths from 1475–1625 nm on ITU grid points or atyour custom specification. These modules offer an impressive
list of features: picometer resolution, high power, exceptional
stability, coherence control, optional source shutter, optional
PM alignment and accurate attenuation.
When installed in the FOM-7900B Fiber Optic System
Mainframe, FOS-79800F Series WDM DFB Fiber Optic Source
Modules are easily controlled through simple front panel menu
entries, or through a full featured GPIB remote interface.
Mainframe trigger capabilities allow you to easily synchronize
output modulation of multiple modules.

PM Alignment
Also available:

PM connector aligned to slow
axis of fiber

SSE50 Optional Spontaneous Emission Specification
Signal/Spontaneous Emission:>50dB (within ±100nm
of center wavelength)

Ordering Information
FOM-7900B
FOS-79800F/315C1
FOS-79800F/315L1
FOS-79800F/315C2
FOS-79800F/315L2
FOS-79800F/315S
FOS-79800F/315EL
FOS-79800F/SERV
FOS-79800F/000
FOS-79710
DPM-79810
SS-810
SSE50
PM Alignment

System Mainframe with eight bay capacity (Includes GPIB interface)
WDM DFB 9-10mW Source Module (1527.98-1564.26nm user-specified wavelength)
WDM DFB 9-10mW Source Module (1564.27-1610.06nm user-specified wavelength)
WDM DFB 10-20mW Source Module (1527.98-1564.26nm user-specified wavelength)
WDM DFB 10-20mW Source Module (1564.26-1610nm user-specified wavelength)
WDM DFB 9-20mW Source Module (1475-1527.97nm user-specified wavelength)
WDM DFB 9-20mW Source Module (1610.01-1625nm user-specified wavelength)
WDM DFB 9-20mW Source Module (1310, 1480, 1510, and 1625 ± 5nm user-specified wavelength)
Special Product for non-standard wavelength
1 x 4 Fiber Optic Switch Module
Dual Power Meter Module
Source Shutter Option (not compatible with PM alignment)
50dB Ratio of Signal to Spontaneous Emission Option
Per Channel PM Alignment

The Standard for Fiber Optic Sources
For information call
P.O. Box 6310 Bozeman, MT 59771 FAX: 406-586-9405

www.ilxlightwave.com

1-800-459-9459
International Inquiries: 406-586-1244

email: sales@ilxlightwave.com
Rev01.3/28/06

79800F
Series

WDM DFB
Fiber Optic
Source Modules