U-Shaped SOA Optical Amplifier Inspection Before Substrate Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The U-turn type semiconductor optical amplifier (SOA) chip configuration makes it difficult to perform effective inspection and evaluation due to the close proximity and small curvature radius of the end surfaces, which complicates optical fiber coupling and reduces evaluation efficiency.
Innovation Solution
An optical amplifier design featuring a pair of semiconductor optical amplifiers connected by a U-shaped waveguide with independent electrodes, allowing for separate voltage application and evaluation before mounting on a base substrate, and a common metal wiring for simplified control after mounting, enabling efficient inspection and improved amplification properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a U-turn type SOA chip is used to miniaturize the device and reduce gap width, then optical coupling loss is suppressed and amplification properties are improved, but the inspection and evaluation of the SOA becomes difficult due to the close proximity of end surfaces
Solution Approach 1:
The patent applies preliminary action by performing inspection and evaluation of the SOA chip before mounting it on the base substrate. The independent electrodes are designed to enable voltage application and optical measurement at the chip level prior to final assembly, allowing characterization to be completed before the chip is permanently fixed in its operational position
Solution Approach 2:
The patent introduces an intermediary approach by using the independent electrodes as separate access points that facilitate measurement without requiring direct optical fiber coupling to the closely spaced end surfaces. The electrodes serve as intermediaries that enable electrical control and optical signal extraction during the inspection phase
2Volume of moving object
If the end surfaces of SOAs are exposed on the same side surface to enable miniaturization, then chip size is reduced, but it becomes difficult to bring optical fibers close to the end surfaces for coupling
Solution Approach 1:
The patent performs optical fiber coupling and alignment operations before mounting the SOA chip on the base substrate. By completing the delicate optical coupling procedure at the chip level while the SOA is still accessible, the patent avoids the difficulty of performing such operations after the chip is fixed in its miniaturized configuration
Solution Approach 2:
The patent transitions the operation from a spatial dimension problem to a temporal dimension solution. Instead of trying to access the closely spaced end surfaces in the spatial domain after mounting, the patent performs the coupling operation in the temporal domain before mounting, when dimensional constraints are not yet applied
3Ease of operation
If independent electrodes are used for each SOA, then separate voltage application and inspection are enabled, but the device structure becomes more complex
Solution Approach 1:
The independent electrodes serve multiple functions: they enable separate voltage application to each SOA for independent inspection, facilitate electrical connection during mounting, and provide access points for characterization. This multi-functionality justifies the additional structural elements by consolidating multiple operations into a unified design
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 design facilitates efficient evaluation of optical amplifier properties by allowing independent voltage application to each SOA before mounting, reducing the need for simultaneous optical fiber coupling and minimizing stray light, thereby ensuring accurate measurement and improved amplification performance.
Implementation Method 1
there is a method of amplifying a transmission light and a reception light by using an optical amplifier
Implementation Method 2
The SOA chip 12 is positioned such that an end surface of a waveguide 11b formed in the base substrate 11 and an end surface of a core layer 12a of the SOA chip 12 oppose to each other and optically coupled
Data Source
AI summary
An optical amplifier includes an optical amplifier chip that includes a pair of semiconductor optical amplifiers (SOAs), a U-shaped waveguide connecting the pair of SOAS, and two electrodes that respectively correspond to the pair of SOAS and are separated from each other, and a base substrate that includes a common metal wiring connecting the two electrodes, and on which the optical amplifier chip is mounted.