Data Sending Device and Data Receiving Device for Optical Fiber
Publication Date: 2008-Jan-10
The IP.com Prior Art Database
A new data sending device and a data receiving device to deliver arbitrary data up to 50 Mbps over a fiber optic link is presented. A data transmission method is integrated into a transmitter and a receiver device, which enables direct connection to an external apparatus without additional fiber optic driver, receiver and/or encoding-decoding circuitry. An encoding method is described which is applied to the optical communication between sending device and receiving device which maximizes link performance.
Data sending device and data receiving device for optical fiber
J.C.J. de langen, Avago Technologies GenerallP (Singapore) Pte Ltd
A new data sending device and a data receiving device to deliver arbitrary data up to SO Mbps over a fiber optic link is presented. A data transmission method is integrated into a transmitter and a receiver device, which enables direct connection to an extemal apparatus without additional fiber optic driver, receiver and/or encoding-decoding circuilry. An encoding method is described which is applied to the optical communication between sending device and receiving device which maximizes link perfonnance.
Avago Technologies has an extensive portfolio of discrete (i.e. individual transmitter and receiver) fiber optic products for multiple fiber types at wavelengths of 650 nm, 820 nm to 1300 run. All these parts have in common that the transmitter needs external current driver circuitry and some of the receivers need post amplification and quantization circuitry. These external circuits are incorporated on the customer's PCB taking up floor space, increase fiber link cost and adds an extra design risk for the customer if they deviate from the Avago Technologies recommended circuits presented in various published application notes. These factors weigh relatively more in customer applications where many fiber optic links carry low speed "control" signals (opposed to one high speed fiber link).
The proposed new data sending device (1) and data receiver device (2) integrate the LED driver circuitry and the receiver post-amp and quantization circuitry within the respective device. This eliminates the need for any external components on the customer PCB and simplifies design-in. To maximize performance of the communication of arbitrary data up to 50 Mbps encoding is applied to the optical signal.
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(1)- ., I""
fiber input output
The data sending device consisting of an optical source and an Ie integrated in one package. The data sending device generates biphase-mark encoded optical signals based on incoming dala from the connected apparatus. The data sending device comprises of:
a) an oscillator clock source (3); and
b) an input data sampling section based on oscillator (4); and
c) a biphase-mark encoding section based on oscillator (5); and