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Phase mask encryption is proposed to improve the transmission privacy of an optical steganography system. The stealth signal carried by amplified spontaneous emission noise is encrypted by a fast changing code.
We demonstrate an optical steganography method with two dimensional encryption to dramatically improve the privacy of optical networks. The transmitted stealth signal carried by noise is secretly hidden under the public channel.
We experimentally demonstrate a short wavelength ZnCdSe/ZnCdMgSe quantum well infrared photodetector (QWIP) with a room temperature responsivity of over 30 A/W. The dark-current limited detectivity at 80 K was measured to be 2×109 cm√Hz/W.
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