Postdoc Associate, University of Rochester


We are working to enhance the security of data in all-optical domain to omit O-E-O conversion.

Due to tremendous growth in the volume of information exchange and strong demands in security and privacy, the issues of physical-layer confidentiality potentially supported by all-optical encryption/ decryption using logic gates and optical code division multiple access (OCDMA) have become an interesting research topic. On the other hand, the increasing demand of high speed forced the modern research trends to ultra-fast all-optical signal processing. All-optical signal processing enhances speed and capacity of the core optical networks by avoiding expensive, time consuming and power hungry optoelectronic conversions. Security as well as capacity in optical transmission link could become a critical issue for some applications such as military networks or enterprise networks. The security sensitive data such as military transactions, financial transactions, medical records, intellectual property etc., which is to be securely transmitted, is done through the internet. The exponential growth in information throughput on the internet increases the transmission of confidential and commercially sensitive data through optical networks. With this, the potential risk of security of this valuable information also increases as tapping of the optical signal from a fiber could be easily done by using inexpensive equipment. Physical layer security is thus becoming an impelling request in the next generation of optical networks. OCDMA technology is an attractive solution for these applications since it provides format-independent security in physical layer while guaranteeing appreciably wide bandwidth. Recently, studies discovered that OCDMA systems are vulnerable to eavesdropping and jamming attacks. The physical layer of the OCDMA network can be attacked by an eavesdropper to intercept the data and by launching an interferer signal to jam the system. A jamming attack can easily manipulate information being transmitted, if jamming signals have the same frequency band as data signals. In addition, the increase in the number of attacks as well as in diverse methods of the attacks which are becoming more difficult to defend makes information security a crucial issue in OCDMA networks. Also, the main degradation factor of an OCDMA system is multiple user interference, caused by the asynchronous transmission between the users and the superposition of the transmitting data in the fiber.