Pluggable Optical Module Modulation Amplitude Control
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Solution Overview
Problem
Pluggable optical modules face challenges in accurately modulating optical signals across various modulation schemes due to variations in detected voltage values, leading to inconsistent modulation operations despite the same peak voltage, as the waveform changes with different modulation schemes.
Innovation Solution
A pluggable optical module design that includes a control unit capable of specifying and adjusting the modulation amplitude of optical signals based on the detected peak voltage, using a look-up table to determine the correct setting value for each modulation scheme, ensuring accurate modulation regardless of the scheme used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a peak detection function is used to detect the voltage of the data signal, then the voltage amplitude can be detected, but the detected voltage value varies depending on the modulation scheme even when the peak voltage is the same
Solution Approach 1:
The patent changes the detection parameter from peak voltage to average voltage of the data signal. By detecting the average voltage instead of the peak voltage, the system achieves accurate voltage detection across different modulation schemes (QPSK, 16QAM, 64QAM) without the variations that occur with peak detection. This parameter change resolves the contradiction by providing both accurate measurement and scheme adaptability.
2Ease of manufacture
If the same peak voltage is used for different modulation schemes, then the data signal voltage can be simplified, but the waveform changes cause the detected voltage to vary
Solution Approach 1:
The patent changes from using peak voltage to using average voltage as the detection parameter. This allows the system to maintain simple voltage settings while achieving precise modulation operations across different schemes. The average voltage detection provides a stable reference that works consistently for QPSK, 16QAM, and 64QAM modulation schemes.
Solution Approach 2:
The patent implements a feedback mechanism where the detected average voltage is fed back to the control unit, which then adjusts the drive voltage for the optical modulator accordingly. This feedback loop ensures that the modulation operation accuracy is maintained across different modulation schemes by continuously adapting to the actual signal characteristics.
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 solution enables accurate output of optical signals corresponding to data signals across different modulation schemes, improving the stability and accuracy of modulation operations by adjusting the bias voltage and amplitude according to the specified modulation scheme, thus ensuring consistent performance.
Implementation Method 1
A Mach-Zehnder type optical modulator mounted in the optical module has a drive voltage Vx for extinguishing an optical modulation output
Data Source
AI summary
An object is to output an optical signal accurately corresponding to a data signal. A pluggable optical module (100) includes a pluggable electric connector (11), a control unit (12), an optical signal output unit (13), and a pluggable optical receptor (14). The pluggable electric connector (11) can communicate a modulation signal (MOD) and a control signal (CON1) with an optical communication apparatus (92). The optical signal output unit (13) outputs an optical signal (LS) modulated by the modulation scheme by the control signal (CON1) in response to the modulation signal (MOD). The pluggable optical receptor (14) is configured in such a manner that an optical fiber (91) is insertable into and removable from the pluggable optical receptor (14). The pluggable optical receptor (14) can output the optical signal (LS) output from the optical signal output unit (13). The control unit (12) controls the optical signal output unit (13) to output the optical signal (LS) of a modulation amplitude set corresponding to the modulation signal (MOD) in the modulation scheme specified by the control signal (CON1).