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DM80-01-2 Datasheet(PDF) 2 Page - Finisar Corporation.

No. de pieza DM80-01-2
Descripción Electrónicos  10Gb/s 120km Telecom CMLTM 13pin-GPO Butterfly Transmitter
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Fabricante Electrónico  FINISAR [Finisar Corporation.]
Página de inicio  http://www.finisar.com/home.php
Logo FINISAR - Finisar Corporation.

DM80-01-2 Datasheet(HTML) 2 Page - Finisar Corporation.

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DM80-01-0/1/2 CML
TM Butterfly Transmitter Product Specification – May 2007
F i n i s a r
©
Finisar Corporation –10-May-07
Rev_A
Page 2
I. Internal Optical Layout
Figure 1
The DM80-01 modules uses a 10Gb/s directly modulated DFB chip co-packaged with an
optical spectral re-shaper (OSR) element as shown in Figure 1. An optical isolator is
included between the DFB and the OSR while a beam-splitter component and 2
photodetectors are configured to allow frequency locking. Lens#1(L1) is used to
collimate the DFB laser output and pass the beam through the splitter and OSR, prior to
coupling into single-mode fiber using Lens#2 (L2). A second isolator is included in the
fiber pigtail to minimize the effect of external back-reflections on module performance.
II. Control Method
The schematic in Figure 2 shows the key components and control loops that are used to
operate the module. The output power of the DFB is monitored by photodetector PD1.
Photodetector PD2 monitors the back-reflection from the OSR. The photocurrent ratio
from the two detectors is used to lock the relative spectral locations of the laser and the
OSR via temperature control of the DFB using TEC#1. A second TEC (TEC#2) controls
the temperature of the OSR and locates the operating point of the OSR on the ITU grid
for DWDM applications.
TEC
DFB
PD2
PD1
OSR
L1
Isolator
Beamsplitter
L2
Fibre stub
Window
Isolator
TEC
DFB
TEC
DFB
PD2
PD2
PD1
PD1
OSR
OSR
L1
Isolator
Beamsplitter
L2
Fibre stub
Window
Isolator
Figure 1. CML internal layout


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