Reading a CD-ROM without a photodiode

Wishon, Michael J.; Mourozeau, Guillaume; Ng, Kar Wei; Sahai, Aakash A.; Locquet, Alexandre; Citrin, D. S.

doi:10.1117/12.2227815

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2017

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“…We changed the position of the diffraction grating in steps of 200 nm and the resulting value of V as a function of position is shown in Fig. 4, as previously reported in [17].…”

Section: Resultsmentioning

confidence: 99%

Reading bits on a CD‐ROM without a photodiode

Wishon

Locquet

Mourozeau

et al. 2017

IET Optoelectronics

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Abstract:We demonstrate that the bits of a CD-ROM can be read without a photodiode (PD). A commercial CD-ROM drive was used and left unmodified except a beam splitter was removed which would route the light to a PD. This allowed for the reflected light to be incident on the laser within the laser package itself. By monitoring fluctuations in the voltage across the laser diode (LD) under constant-current injection, it was possible to read and interpret the bits from a spinning CD-ROM.

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“…We changed the position of the diffraction grating in steps of 200 nm and the resulting value of V as a function of position is shown in Fig. 4, as previously reported in [17].…”

Section: Resultsmentioning

confidence: 99%