Double-Sideband OFDM Modulator Bandwidth Utilization
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Solution Overview
Problem
In optical communications, traditional OFDM systems only utilize the positive sideband for service data, leaving the negative sideband unused, resulting in suboptimal bandwidth utilization.
Innovation Solution
A double-sideband OFDM modulation scheme is implemented, where service data is carried on both positive and negative sidebands using a double-sideband OFDM modulator and IQMZ modulator, followed by optical carrier modulation to generate a double-sideband OFDM optical signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If service data is only filled in the positive sideband, then the system is simple to implement, but bandwidth utilization is low
Solution Approach 1:
The patent transitions from single-sideband to double-sideband OFDM modulation, utilizing both positive and negative frequency sidebands simultaneously. This dimensional expansion in the frequency domain allows service data to be transmitted on both sidebands, effectively doubling the bandwidth utilization while maintaining system feasibility through standardized modulation techniques
2Quantity of substance
If double-sideband OFDM modulation is implemented, then bandwidth utilization is doubled, but device complexity increases
Solution Approach 1:
The IQMZ modulator is designed to perform multiple functions: it modulates the double-sideband OFDM analog electrical signal onto the optical carrier while simultaneously generating the optical signal. This multi-functional approach consolidates what could be separate components into a single integrated device, managing the complexity increase through functional integration rather than adding separate components
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 doubles bandwidth utilization by transmitting service data on both sidebands, improving the efficiency of data transmission in optical communications.
Implementation Method 1
an IQMZ modulator, configured to perform optical carrier modulation on the double-sideband OFDM analog electrical signal output by the double-sideband OFDM modulator, to obtain a double-sideband OFDM optical signal
Data Source
AI summary
A receiving apparatus and method, a sending apparatus and method, a front-end circuit, a modulator, and a transceiving system are provided. The sending apparatus includes: a double-sideband OFDM modulator, configured to perform double-sideband OFDM modulation on a bit sequence of service data to obtain a double-sideband OFDM analog electrical signal, where the double-sideband OFDM analog electrical signal carries the service data on both positive and negative sidebands, and an IQMZ, configured to perform optical carrier modulation on the double-sideband OFDM analog electrical signal to obtain a double-sideband OFDM optical signal, where the double-sideband OFDM optical signal carries the service data on both positive and negative sidebands. In comparison with a traditional manner in which service data is only carried on a positive sideband, bandwidth utilization in the present invention doubles.