Intelligent Transmitter Module Hybrid Substrate Integration
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Solution Overview
Problem
Current optical transmission technologies face challenges in achieving high-speed data transmission while minimizing electronic interconnects, which leads to issues with jitter performance, signal integrity, and electromagnetic compliance due to the need for multiple components and complex interconnections in SONET applications.
Innovation Solution
An intelligent transmitter module is developed, integrating a temperature-controlled laser with chirp management, a clock and data recovery circuit, and a high current switching driver, along with a microcontroller and linear amplifier, to reduce interconnects and improve signal integrity by using a hybrid package with separate substrates for electronic and optical components, and implementing thermal chirp compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional directly modulated lasers or externally modulated lasers are used to achieve 10G data rates, then transmission distance is limited to less than 100 km due to adiabatic chirp and transient chirp causing rapid distortion, but using Lithium Niobate Mach-Zehnder or InP Mach Zehnder modulators can achieve long haul transmission beyond 100 km at higher cost, larger size, and higher power consumption
Solution Approach 1:
The patent applies parameter changes by utilizing a distributed feedback laser with specific chirp characteristics and adjusting operating parameters to enable long-haul transmission. The system changes the laser's frequency modulation parameters to compensate for signal distortion over distance, achieving beyond 100km transmission without requiring complex external modulators.
Solution Approach 2:
The patent replaces the mechanical/optical modulation system (external modulators) with an electronically controlled laser system. By using a distributed feedback laser with direct modulation and electronic chirp management, the system substitutes complex optical modulation hardware with a more integrated laser-based approach that achieves similar or better performance.
2Device complexity
If multiple electronic interconnects are used in optical transmission modules, then component integration is achieved, but jitter performance deteriorates and signal integrity is compromised due to reflections and bandwidth limitations
Solution Approach 1:
The patent merges the laser, modulator, and detection functions into a single integrated distributed feedback laser system. By combining these functions that would traditionally require separate components and multiple interconnects, the system eliminates the associated reflections and bandwidth limitations, improving signal integrity while maintaining component integration.
Solution Approach 2:
The patent extracts the problematic electronic interconnects from the system by using a self-contained laser system that generates and modulates optical signals internally. This removes the need for multiple external electronic connections that cause reflections and jitter, while still achieving the necessary functional integration.
3Speed
If high frequency signals are generated for high-speed transmission, then data transmission speed is improved, but electromagnetic emissions increase causing EMI compliance challenges
Solution Approach 1:
The patent replaces high-frequency electronic signal generation with optical frequency generation using a distributed feedback laser. By operating in the optical domain rather than electronic frequencies, the system achieves high-speed transmission (10G and above) without generating the electromagnetic emissions that would cause EMI compliance issues.
Solution Approach 2:
The patent changes the operating frequency parameter from electronic frequencies to optical frequencies. This parameter change enables high-speed data transmission while avoiding the electromagnetic emission problems associated with high-frequency electronic signals, as optical signals do not generate EMI in the same manner.
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 solution enables high-speed data transmission with improved signal integrity and reduced electromagnetic interference, allowing for long-haul applications beyond 100 km while minimizing manufacturing costs and increasing control capabilities.
Implementation Method 1
a microcontroller IC and one or more DAC or A/D functions can be included in the intelligent transmitter module hybrid package to control the optical transmitter and the electronics. Advantageously, integration of the aforementioned electronics ICs within the intelligent transmitter module reduces the number of interconnects in and out of the intelligent transmitter module, which improves signal integrity.
Implementation Method 2
the optical transmitter comprises a temperature-controlled laser with chirp that is managed
Implementation Method 3
the CDR IC, the driver IC, and a linear amplifier IC to amplify the modulation signal to a large voltage/current needed to drive the laser
Implementation Method 4
The first substrate is thermally isolated from the second substrate to minimize heat transfer between the laser/associated components and the other components of the intelligent transmitter module
Data Source
AI summary
An intelligent transmitter module (“ITM”) includes a CDR circuit for equalizing and retiming an electrical data signal, a driver for generating a modulation signal and/or performing waveform shaping of the equalized and retimed signal, and an optical transmitter configured to emit an optical signal representative of the data signal. A linear amplifier may also be included to amplify the modulation signal when the optical transmitter is a laser with managed chirp. Alternately or additionally, a microcontroller with a 14-bit or higher A2D can be included to control and optimize operation of the ITM. In one embodiment, the CDR, driver, linear amplifier, and/or microcontroller are flip chip bonded to a first substrate while the laser with managed chirp is bonded to a second substrate. The first substrate may comprise a multi-layer high frequency laminate.