Data communication around the whole globe has seen an enormous increase in the exchange of data across the networks. This has urged the need of optical communication systems that can provide the desired bandwidth. This paper is a step to the path of building such optical processing elements. The paper presents optical designs of a 3-bit incrementer and a 3- bit decrementer logic function. The two optical circuits increment or decrement each 3-bit input binary number by unity. The optical designs have been implemented using the LiNbO3 based Mach-Zehnder Interferometer (LNMZI) electrooptical switches. The incrementer circuit has employed just five LNMZIs and the decrementer circuit has only six LNMZIs. The optical circuits have been designed and tested using beam propagation method (BPM). A critical analysis of the two designs has been performed by calculation of the important performance metric parameters like extinction ratio (ER), contrast ratio (CR), insertion loss (IL). The incrementer/decrementer shows best values of ER, CR and IL as 31.43 dB, 35.71 dB and 0.95 dB respectively. The calculated parameters have been found within the acceptable limits which support the feasibility of the design.
In this paper, tri-state buffer and tri-state inverter circuits using the electro-optical effect have been proposed. Both the tri-state devices have three terminals as input, output and enable. An enable terminal is used to control the direction of the flow of the input towards the output. Mach-Zehnder interferometer (MZI) is used as the switching element for the designing of the tri-state buffer and tri-state inverter. The tri-state buffer circuit transfers the data, as it is, to the desired output port and the tri-state inverter sends the inverted data to the desired output port. Using the tri-state buffer and inverter, an optical integrated circuit is proposed. To analyse the operation of the device, the performance parameters like extension ratio, insertion loss, and contrast ratio are computed and found as 26.65, 19.41 and 0.07 dB respectively.
A code is said to be an error-correcting, if the correct code word can always be deducted from an erroneous word. Hamming code is most suitable for error detection and correction for digital data. It facilitate error detection and correction in code information. Here 7 bit Hamming code convertor is proposed. In this code, to each group of m information bits, n parity checking bits are located at positions 2(n-1) from left are added to form an (m+n)-bit code word. Code convertor device is designed using Mach-Zehnder interferometer (MZI). MZI is an optical switch, able to transfer signal from one port to other.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.