Signal transmission system using a dual-purpose pin
A technology of signal transmission system and optical sub-components, applied in electromagnetic transceivers, electromagnetic transmitters, electromagnetic receivers, etc., can solve the problems of lack of undesired control signals, feeding into ROSA, restrictions, etc.
Active Publication Date: 2013-11-20
AVAGO TECH INT SALES PTE LTD
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Problems solved by technology
It can be appreciated that this type of predetermined pin assignment places severe limitations on any other functionality that a ROSA can provide
For example, the lack of input pins prevents the device user from feeding desired control signals into the ROSA
Method used
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[0021] Various embodiments relate generally to systems and methods related to implementing a bidirectional signal transmission system using dual-purpose pins of a pin limited package. Unlike conventional input / output (I / O) pins that support bi-directional signaling by including control logic that tri-states drivers when the receiving device is active, dual-purpose pins according to the present invention can operate is an output pin for sending a first signal out of the limited-pin package, while being operable to be accessible by circuitry located outside the limited-pin package for generating a second signal (e.g., a control signal) inside the limited-pin package input pin. The operation is performed by modulating the first signal with one or more elements of the external circuit while the first signal is being transmitted from the pin limited package. The modulated first signal is coupled to a receive circuit located inside the pin limited package. The receive circuit uses...
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A signal transmission system in accordance with the invention is implemented using a dual-purpose pin of an optical sub-assembly. The dual-purpose pin is used to propagate an analog signal out of the optical sub-assembly and also for providing an access point where an external element may be coupled to the optical sub-assembly for modulating the analog signal. The optical sub-assembly houses a photodetector, a signal transmitter circuit, and a signal receiver circuit. The photodetector receives light and generates a corresponding electrical signal indicative of the light intensity. The signal transmitter circuit converts the electrical signal received from the photodetector into the analog signal that is transmitted out of the dual-purpose pin. The signal receiver circuit located inside the optical sub-assembly is configured to monitor the modulated analog signal from the dual-purpose pin and generate therefrom, a control signal inside the optical sub-assembly.
Description
technical field [0001] The present invention relates to a bidirectional signal transmission system using dual-purpose pins. Background technique [0002] When packaging electronic circuits into integrated circuits (ICs) or subassemblies, it is desirable to maximize certain parameters such as circuit density, input / output availability, and circuit functionality, while maximizing parameters such as power dissipation, package size, and pinout Some other parameters such as the number are minimized. [0003] For this purpose, a 5-pin subassembly package is traditionally used to house an optical device such as an optical receiver or optical transmitter and its associated electronic circuitry. One such optical device is an optical receiver package commonly referred to as a receiver optical subassembly (ROSA). A 5-pin ROSA includes a first pin for connection to a positive voltage, a second pin for ground, a third pin for outputting a differential data signal derived from an optica...
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IPC IPC(8): H04B10/50H04B10/60
CPCH04B10/66H04B10/50H04B10/40
Inventor 弗雷德里克·W·米勒迈克尔·A·鲁宾逊
Owner AVAGO TECH INT SALES PTE LTD