DPSK Modulation-Demodulation Using Parallel Signal Segmentation
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Solution Overview
Problem
DPSK modulation-demodulation methods in optical communication systems face challenges of high cost, high power consumption, and large size due to the need for high-speed semiconductor processes and complex device structures, which hinder cost-effective and compact implementation, especially when handling different data speeds.
Innovation Solution
The implementation of a DPSK modulation-demodulation method using a coding unit that operates at a reduced rate (1/N) of the original signal, allowing for parallel processing and shared components such as a 1-bit delay interferometer, which reduces the need for high-speed components and enables compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a DPSK modulation coding unit operable at super-high speed is used, then transmission performance is improved, but device cost and power consumption increase significantly
Solution Approach 1:
The transmission speed R is divided into N parallel channels operating at R/N speed. Instead of using one complex super-high-speed coding unit, the system segments the signal into N parallel streams that can be processed by simpler, lower-speed coding units, thereby reducing device cost and power consumption while maintaining the required transmission speed.
Solution Approach 2:
The system transitions from a single high-speed serial processing dimension to a parallel processing dimension by dividing the Rbps signal into N parallel R/N bps signals. This dimensional change allows the use of multiple lower-speed coding units instead of one high-speed unit, reducing the complexity and cost of individual components.
2Speed
If a DPSK modulation coding unit operable at super-high speed is used, then transmission performance is improved, but power consumption increases
Solution Approach 1:
The total transmission speed R is segmented into N parallel channels operating at R/N speed each. This segmentation allows the use of multiple lower-power coding units instead of one high-power super-high-speed unit, significantly reducing overall power consumption while maintaining the required transmission performance.
3Speed
If high-speed components are used for super-high speed operation, then transmission speed is improved, but device size increases
Solution Approach 1:
The system segments the high-speed transmission into N parallel lower-speed channels. Each channel uses simpler, more compact components operating at R/N speed, allowing for a more compact overall device layout compared to using a single super-high-speed component that would require larger spacing and more complex interconnections.
4Speed
If a single high-speed coding unit is used, then transmission speed is maintained, but adaptability to different data speeds is reduced
Solution Approach 1:
The system achieves multi-functionality by using N parallel coding units that can operate at R/N speed, which can be configured to handle different transmission rates. The same parallel architecture can be adapted to different data speeds by adjusting N, providing versatility across multiple speed requirements rather than being locked into a single high-speed configuration.
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
This approach significantly reduces the cost, power consumption, and size of optical communication devices while enabling efficient operation across multiple data speeds, facilitating cost-effective and compact system design.
Implementation Method 1
The 1-bit delay interferometer 1332, with an Rbps phase modulation optical signal Q′ which has been transmitted through the optical fiber 103 as an input, detects a phase difference with a one-bit preceding signal to output an intensity modulation optical signal F′ corresponding to the phase deference.
Implementation Method 2
The optical-electric signal converter 1334, with the Rbps intensity modulation optical signal F′ as an input, outputs an Rbps electric signal D′.
Data Source
AI summary
In the optical communication device and the optical communication system using DPSK modulation whose cost is low, whose size is small and whose power consumption is low, the N:1 multiplexer 125 generates a serial signal by multiplexing a parallel signal coded by the DPSK modulation coding units 115˜117 bit by bit on a time division basis. The electric-phase modulation optical converter 127 converts a serial signal into a phase modulation light. The N-bit delay interferometer 132 executes DPSK decoding with respect to a phase modulation light by comparison with an N-bit preceding optical signal. The optical-electric signal converter 134 converts a decoded intensity modulation light into an electric signal. The N:1 demultiplexer 136 divides an electric signal converted by the optical-electric signal converter 134 into a number N of signals bit by bit on a time division basis.