Embodiment of optical interconnection circuits for the mobile phone application

Abstract

This paper intends to show that the optical interconnection can be a substitute of the electrical serial interface in mobile application. We designed the optical interconnection interface circuits on the evaluation boards which typically correspond to the mobile phone and transferred the data through the optical waveguide module. There are 4 pairs of VCSEL (Vertical Cavity Surface Emitting Laser) and PD (Photo Diode) arrays in the waveguide module and they are used to send the strobe and the data signal in dual-simplex (i.e. Two Directions with Unidirectional Lanes) configuration. We have demonstrated a successful data transmission of moving picture and real-time camera module images to the main-LCD (Liquid Crystal Display) repeatedly and the still pictures to the sub-LCD at the maximum speed of 400Mbps.

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“…With the recent rapid progress in broadband communication, the application of optical interconnection technology for high-rate data transmission has been attempted, even in mobile applications. 1,2) For mobile phones, for example, the optical interconnection is intended to be applied between the application processor and the display driver through the folding hinge and is expected to have a capability of high-rate serial data transmission of 1-3 Gbps or more. [2][3][4] Although some obstacles such as cost and/or power consumption currently exist, the growing problems due to the current electrical interconnection, such as electromagnetic interference (EMI) and/or impedance mismatching, motivate us to realize a system applying optical interconnection technology.…”

“…1,2) For mobile phones, for example, the optical interconnection is intended to be applied between the application processor and the display driver through the folding hinge and is expected to have a capability of high-rate serial data transmission of 1-3 Gbps or more. [2][3][4] Although some obstacles such as cost and/or power consumption currently exist, the growing problems due to the current electrical interconnection, such as electromagnetic interference (EMI) and/or impedance mismatching, motivate us to realize a system applying optical interconnection technology. [1][2][3][4] Generally, the proposed optical interconnection module consists of a transmitter block (Tx), a receiver block (Rx), and a connecting line between them.…”

“…[2][3][4] Although some obstacles such as cost and/or power consumption currently exist, the growing problems due to the current electrical interconnection, such as electromagnetic interference (EMI) and/or impedance mismatching, motivate us to realize a system applying optical interconnection technology. [1][2][3][4] Generally, the proposed optical interconnection module consists of a transmitter block (Tx), a receiver block (Rx), and a connecting line between them. 1,2) There are two types of connecting line: one is an optical waveguide 2,3) and the other is an optical fiber.…”

“…[1][2][3][4] Generally, the proposed optical interconnection module consists of a transmitter block (Tx), a receiver block (Rx), and a connecting line between them. 1,2) There are two types of connecting line: one is an optical waveguide 2,3) and the other is an optical fiber. 1) The optical waveguide is a flexible film, and it is easy to increase the number of waveguides in one film and to combine it with an electrical flexible printed circuit (FPC).…”

“…The Tx and Rx consist of at least a pair of a laser diode (LD) and its driver IC, and at least a pair of a photodiode (PD) and its amplifier IC, respectively. 1,2) In mobile applications, both the Tx and Rx are required to be very small. One of the methods to realize this is to employ a silicon optical bench (SiOB).…”