Effects of Proton Irradiation on InGaAs/AlGaAs Multiple Quantum Well Modulators (Preprint)
Conference paper no. 470
NAVAL RESEARCH LAB WASHINGTON DC
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Recently large area multiple quantum well MQW optical modulators have been coupled to cornercube optical retro-reflectors to allow free-space optical communications using a lightweight, low-power device. A pointingtracking system and laser are required only on one end of the link. Such a system is attractive for ground-to-space links or space-to-space communication between a satellite and a microsat. An important question for these potential space-borne systems is the radiation tolerance of the MQW modulator, which is the principle active component. To investigate this subject, we irradiated three 0.5 cm diameter InGaAsAlGaAs modulators using a sequence of bombardments of 1 MeV protons. One of the devices was irradiated while under a normal operating reverse bias voltage of 15 V the other devices were unbiased. After each exposure the electronic, optical and modulation characteristics of the modulators were evaluated. No degradation was observed until a cumulative fluence of 1x10exp 14 protonssq cm, equivalent to an ionizing radiation dose of approximately 200 MradSi.
- Lasers and Masers
- Test Facilities, Equipment and Methods
- Unmanned Spacecraft