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Agere Systems

D2587P903 Datasheet Preview

D2587P903 Datasheet

Wavelength-Selected High-Power D2587P-Type (with Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules

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Data Sheet, Rev. 2
July 2001
Wavelength-Selected High-Power D2587P-Type (with
Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules
Applications
s Telecommunications:
— Dense WDM
— SONET/SDH OC-192/STM-64
— Extended and ultralong reach
— Undersea systems
s Digital video
Featuring wavelength selection and locking capabilities, the
D2587P Laser Module is ideally suited for use with external
lithium niobate modulators, and in high-power (20 mW) appli-
cations.
Features
s High-performance, multiquantum-well (MQW),
distributed-feedback (DFB) laser
s D2587P-Type is offered on 50 GHz ITU grid
wavelengths ranging from 1528.77 nm—
1610.06 nm
s D2547P-Type is offered on 100 GHz ITU grid
wavelengths ranging from 1528.77 nm—
1610.06 nm
s Polarization-maintaining fiber pigtail
s For use with lithium niobate modulators
s High optical power (20 mW, CW)
s Hermetic, 14-pin package
Description
The D2587P-Type DFB laser module is designed for
use with an external lithium niobate modulator and
also in applications where high power (20 mW) is
required.
The use of an internal wavelength locker greatly
enhances long-term reliability and reduces chirp and
mode dispersion when used in conjunction with LN
modulators at OC-192 data rates.
A companion device, the D2547P high-power DFB
laser module, is also designed for use with a lithium
niobate external modulator, but without the use of an
internal wavelength locker.




Agere Systems

D2587P903 Datasheet Preview

D2587P903 Datasheet

Wavelength-Selected High-Power D2587P-Type (with Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules

No Preview Available !

Wavelength-Selected, High-Power D2587P-Type (with Wavelength
Locker)/D2547P-Type Isolated DFB Laser Modules
Data Sheet, Rev. 2
July 2001
Description (continued)
Principles of Operation (Controlled Wave-
length)
The single-channel, wavelength-selected DFB (ILM) pack-
age contains internal wavelength-discriminating optics, i.e.,
two etalons and associated photodiodes. The output con-
sists of analog signals suitable for controlling the electrical
current of the thermoelectric cooler (TEC) and the DFB
laser.
Controlled Feedback
The module contains an internal optical isolator that sup-
presses optical feedback in laser-based, fiber-optic sys-
tems. Light reflected back to the laser is attenuated a
minimum of 30 dB.
Controlled Temperature
An integral TEC provides stable thermal characteristics.
The TEC allows for heating and cooling of the laser chip to
maintain a temperature of 25 °C for case temperatures from
–25 °C to +70 °C. The laser temperature is monitored by
the internal thermistor, which can be used with external cir-
cuitry to control the laser chip temperature.
Controlled Power
An internal, InGaAs, PIN photodiode functions as the back-
facet monitor. The photodiode monitors emission from the
rear facet of the laser and, when used in conjunction with
control circuitry, can control optical power launched into the
fiber. Normally, this configuration is used in a feedback
arrangement to maintain consistent laser output power.
Standard Package
The laser module is fabricated in a 14-pin, hermetic, metal/
ceramic butterfly package that incorporates a bias tee that
separates the dc-bias path from the RF input. The RF input
has a nominal 25 impedance.
The laser module is equipped with Fujikura* polarization-
maintaining fiber (PMF). The fiber is PANDA type and is the
same fiber that is used on the Agere Systems Inc. lithium
niobate modulators. It has a mode field diameter of
10.5 µm, a cladding diameter of 125 µm ±3 µm, and a
loose tube jacketed fiber 900 µm in diameter. Figure 1
shows the orientation of polarization in the fiber.
Agere Systems’ optoelectronic components are being qual-
ified to rigorous internal standards that are consistent with
Telcordia Technologies TR-NWT-000468. All design and
manufacturing operations are ISO § 9001 certified. The
module is being fully qualified for central office applications.
* Fujikura is a registered trademark of Fujikura Ltd.
Telcordia Technologies is a trademark of Telcordia Technologies
Inc.
§ ISO is a registered trademark of The International Organization for
Standardization.
CORE
STRESS ROD
PRINCIPLE POLARIZATION
AXIS
CLADDING
INNER COATING
(SILICON & ACRYLATE)
OUTER COATING
1-771(C).a
Figure 1. Polarization-Maintaining Fiber
Pin Information
Table 1. Pin Descriptions
Pin D2587P-Type
D2547P-Type
1 Thermistor
2 Thermistor
3 Laser dc Bias
(Cathode) (–)
4 Back-facet Monitor
Anode (–)
5 Back-facet Monitor
Cathode (+)
6 TEC (+)1
7 TEC (–)1
8 Case Ground
9 λ Photodiode 2 Anode
10 λ Photodiode 1 Anode
11 Laser Anode (+) 2
12 RF Laser Input
Cathode (–)
13 Laser Anode (+) 2
14 NC
Thermistor
Thermistor
Laser dc Bias
(Cathode) (–)
Back-facet Monitor
Anode (–)
Back-facet Monitor
Cathode (+)
TEC (+)1
TEC (–)1
Case Ground
Case Ground
Case Ground
Laser Anode (+) 2
RF Laser Input
Cathode (–)
Laser Anode (+) 2
Case Ground
1. A positive current through the thermoelectric heat pump cools the
laser.
2. Both leads should be grounded for optimum performance.
2 Agere Systems Inc.


Part Number D2587P903
Description Wavelength-Selected High-Power D2587P-Type (with Wavelength Locker)/D2547P-Type Isolated DFB Laser Modules
Maker Agere Systems
Total Page 14 Pages
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