Burst Optical Signal Receiving Device for 10GEPON
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical communication systems lack a mature chip solution to receive burst optical signals at 10.3125 Gbps, as existing optical signal receiving chips are designed for continuous signals, failing to meet the IEEE 10GEPON draft requirements for recovery time and sensitivity in 10GEPON systems.
Innovation Solution
A burst optical signal receiving device is developed, incorporating a photodetector, trans-impedance amplifier with DC cancellation, AC coupling capacitors, and a limiting amplifier, which allows for simultaneous amplification of AC and DC signals, optimizing data recovery time and dynamic range by disabling DC cancellation functions and adjusting bias currents and capacitance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an existing optical signal receiving chip designed for continuous signals is used, then the device structure is simple and manufacturing is easy, but it cannot recover burst optical signals within the required time and fails to meet sensitivity requirements
Solution Approach 1:
The receiving device is segmented into multiple functional modules: photodetector, trans-impedance amplifier, AC coupling circuit, and limiting amplifier. Each module handles a specific aspect of burst signal processing, allowing the system to meet recovery time requirements while maintaining manageable complexity through modular design.
Solution Approach 2:
The device employs dynamic working mechanisms including adjustable DC bias input and AC coupling capacitors that adapt to burst signal characteristics. The trans-impedance amplifier transitions from static continuous signal handling to dynamic burst signal processing by enabling DC cancellation function and adjusting bias conditions based on signal type.
2Measurement precision
If DC cancellation function is enabled in trans-impedance amplifier, then DC offset is reduced, but data recovery time increases and burst signal performance deteriorates
Solution Approach 1:
The DC cancellation function is applied partially rather than continuously. It is enabled only during specific phases of burst signal reception when DC offset compensation is needed, rather than being permanently enabled, thus avoiding the time penalty during critical data recovery phases while still providing precision benefits when required.
Solution Approach 2:
The DC cancellation function operates periodically or phase-dependently during burst signal reception, activating during periods when DC offset compensation is beneficial and remaining inactive during periods when fast response is critical, creating a periodic pattern of enablement that balances precision and speed requirements.
3Adaptability or versatility
If AC coupling capacitors with larger capacitance values are used, then dynamic range is widened, but data recovery time increases
Solution Approach 1:
The capacitance values of AC coupling capacitors are optimized to specific ranges (e.g., 100pF to 10nF) rather than using arbitrarily large values. This parameter optimization achieves sufficient dynamic range for burst signal accommodation while limiting the time constant to prevent excessive data recovery time, finding the optimal balance point in the parameter space.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively recovers burst optical signals into valid electric signals within the required time frame and dynamic range, satisfying the IEEE 10GEPON draft specifications by shortening data recovery time and widening the input signal range.
Implementation Method 1
a photodetector, a trans-impedance amplifier
Data Source
AI summary
A burst optical signal receiving device is provided, which includes an optical receiving component and a limiting amplifying circuit unit. The optical receiving component further includes a photodetector, a trans-impedance amplifier, a first direct current (DC) cancellation forbidding circuit, and a DC bias circuit, and the limiting amplifying circuit unit further includes a group of alternating current (AC) coupling capacitors, a limiting amplifier, and a second DC cancellation forbidding circuit. Through the technical solution, an input burst optical signal within a certain dynamic range can be recovered into a valid burst electric signal in shorter time. The technical solution can be applied in a burst optical signal receiver in a 10-Gigabit Ethernet passive optical network (10GEPON).