High-performance surface-normal modulators based on stepped quantum wells

Mohseni, Hooman; An, H.; Ulmer, Anatoli; Capewell, D.; Chan, W.K.

doi:10.1109/leos.2004.1363586

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…The LPF can be implemented with 0.1 nf capacitance and 10 ohm resistance would have a response time of 1ns. Finally, the SLM could be realized with an array of high speed stepped quantum wells [16][17][18][19][20]. An SLM based on these elements has a response time of ~16 ns, which is orders of magnitude faster than the conventional SLM discussed in section 2.…”

Section: Possible Future Work To Speed Up Operation Of Hocmentioning

confidence: 99%

Hybrid optoelectronic correlator architecture for shift-invariant target recognition

et al. 2013

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In this paper, we present theoretical details and the underlying architecture of a hybrid optoelectronic correlator that correlates images using Spatial Light Modulators (SLM), detector arrays and Field Programmable Gate Array (FPGA). The proposed architecture bypasses the need for nonlinear materials such as photorefractive polymer films by using detectors instead, and the phase information is yet conserved by the interference of plane waves with the images. However, the output of such a Hybrid Opto-electronic Correlator (HOC) has four terms: two convolution signals and two cross-correlation signals. By implementing a phase stabilization and scanning circuit, the convolution terms can be eliminated, so that the behavior of an HOC becomes essentially identical to that of a conventional holographic correlator (CHC). To achieve the ultimate speed of such a correlator, we also propose an Integrated Graphic Processing Unit which would perform all the electrical processes in a parallel manner. The HOC architecture along with the phase stabilization technique would thus be as good as a CHC, capable of high speed image recognition in a translation invariant manner.

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Section: Possible Future Work To Speed Up Operation Of Hocmentioning

confidence: 99%

Hybrid optoelectronic correlator architecture for shift-invariant target recognition

et al. 2013

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“…In this paper, we demonstrate the first ToF SWIR camera operating at 150 MHz modulation frequency. A key innovation in this system in comparison to a PMD device is the open architecture configuration, which uses an efficient large format electro-absorptive modulator [7] as a global shutter to demodulate the reflected light from the scene before it is captured by an operationally independent image sensor. This configuration enables a free selection of the imaging chip, which can be non-silicon based.…”

Section: Introductionmentioning

confidence: 99%

Open architecture time of flight 3D SWIR camera operating at 150 MHz modulation frequency

et al. 2017

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In the past two decades 3-D cameras have proven to be one of the next revolutions in machine vision. However, these devices are still an emerging technology with a particularly narrow set of commercially available devices. In this paper, the concept and execution of the first short wavelength infrared (SWIR) time-of-flight (ToF) 3-D camera system operating at a wavelength of 1550 nm is presented. By decoupling the optical and electrical components of the system in an open architecture we not only surpass many of the limitations of an on-chip integrated solution, but also can easily change the imaging device based on the requirements of the application. We achieve modulation frequencies up to 150 MHz, which exceeds the conventional values currently published for other large format modulators by about five times. This increase in the modulation frequency allows for a TOF camera with significantly higher depth resolution, while the open architecture design allows for a highly reconfigurable device that can be modified for specific working conditions.

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High-performance surface-normal modulators based on stepped quantum wells

Cited by 2 publications

References 4 publications

Hybrid optoelectronic correlator architecture for shift-invariant target recognition

Hybrid optoelectronic correlator architecture for shift-invariant target recognition

Open architecture time of flight 3D SWIR camera operating at 150 MHz modulation frequency

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