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DM80-01-2 Datasheet(PDF) 2 Page - Finisar Corporation. |
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DM80-01-2 Datasheet(HTML) 2 Page - Finisar Corporation. |
2 / 10 page 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 |
Número de pieza similar - DM80-01-2 |
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Descripción similar - DM80-01-2 |
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