Abstract
The Versatile Transceiver is a part of the Versatile Link project, which is developing optical link architectures and components for future HL-LHC experiments. While having considerable size and weight constraints, Versatile Transceivers must work under severe environmental conditions. One such environmental parameter is the temperature: the operating temperature range is specified to be from -30 to +60°C. In this contribution we present the results of the temperature characterization of the VTRx transmitter and receiver. Several transmitter candidates from three different manufacturers have been characterized: multi-mode Vertical Cavity Surface-Emitting Lasers and a single-mode Edge-Emitter Laser. Also both single- and multi-mode receivers have been tested.
Highlights
The Versatile Transceiver is a part of the Versatile Link project, which is developing optical link architectures and components for future HL-LHC experiments
The optical output of a reference transmitter went through a JDSU MAPA+23 variable optical attenuator (VOA) to the DUT situated in the temperature test chamber
Typical light-current characteristic (LI) characteristics of VTRx modules using TOSAs from different manufacturers are shown in figures 3a, 3b, and 4a
Summary
The measurements were carried out in a CTS T-40/50 temperature test chamber. The device under test (DUT, see figure 1a) was attached to a module compliance board (MCB) inside the chamber, see figure 1b. During the testing of the GBLD modules, an Agilent J-BERT N-4903A bit error tester provided a clock signal for a LeCroy SDA100G serial data analyzer (scope) and a pseudo random data pattern (PRBS-7) for the DUT. A Centellax TG1C1-A clock synthesizer and a Centellax TG2P1A pseudo-random bit sequence source were used when modules using commercial drivers were tested. Even though both sources provided a high quality input signal, the small difference in jitter values between the sources was taken into account during the analysis. The slow decrease of temperature is necessary for silica gel to absorb humidity, and avoid any condensation inside the chamber. Several eye diagrams were taken varying the bias current and varying the modulation current
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