Min-Ching Lin

High-Performance Low-Cost 10-Gb/s Coaxial DFB Laser Module Packaging by Conventional TO-Can Materials and Processes

High-performance low-cost 10-Gb/s coaxial DFB laser module packages made by conventional TO-Can materials and processes are developed and fabricated. The laser module has a built-in matching resistor to reduce the resonant phenomenon. In order to optimize the modules performance, a detailed equivalent circuit model is established to investigate both the DFB laser diode and the coaxial package comprehensively. This uncooled 10-Gb/s laser module operates at a high temperature of up to 105degC, and maintains an eye mask margin above 28% in the full operational temperature range to meet the stringent requirements of 10-Gb/s Ethernet for long-reach applications. This paper demonstrates that it is possible to fabricate cost-effective packages using existing low-cost TO-Can package technology while maintaining the high performance of the 10-Gb/s coaxial laser modules. Previously, the high-performance 10-Gb/s coaxial laser modules have only been available by using complicated design, customized components, and specialized fabrication process

High-Performance and Low-Cost 10-Gb/s Bidirectional Optical Subassembly Modules

High-performance and low-cost 10-Gb/s bidirectional optical subassembly (BOSA) modules that are obtained by adopting low-cost transistor outline (TO)-Can materials and processes are proposed and demonstrated. The BOSA module consists of an uncooled 1.3-mum distributed-feedback laser diode and a 1.5-mum p-i-n/transimpedance amplifier receiver (Rx), which integrate a 45deg tilted thin-film wavelength-division multiplexing filter to transmit a 1.3-mum light into the fiber and reflect a 1.55-mum light into the Rx. The matching resistor and low parasitic inductance packages are applied with the TO-Can laser diode to enable 10-Gb/s operation. A modulation bandwidth of 11.86 GHz and an OC-192 eye diagram of a 19% mask margin are obtained from the transmitter side. After a 10-km single-mode fiber (SMF) transmission, the mask margin for the OC-192 eye diagram decreases to 11%. For the Rx, an OC-192 eye diagram of a 31% mask margin is obtained under back-to-back connections. The mask margin is maintained at 29% after a 10-km SMF transmission. The measured crosstalk penalty is 0.9 d 15 at the Rx side. These results indicate that the BOSA module is capable of a 10-Gb/s bidirectional transmission. This unique high-performance 10-Gb/s BOSA module not only demonstrates the feasibility of a 10-Gb/s bidirectional transmission on an SMF for fiber-to-the-home applications but also shows the low-cost possibility to ensure the success of next-generation 10-Gb/s access networks.

High-Performance Electromagnetic Susceptibility of Plastic Transceiver Modules Using Carbon Nanotubes

A high-performance electromagnetic susceptibility (EMS) of plastic transceiver module using carbon nanotube (CNT) composites is proposed. The shielding effectiveness (SE) of the CNT composites increases as the weight percentage of the CNTs increases. The SE of CNT composites with 50% weight percentage CNTs exhibits 38-45 dB. The EMS performance is experimentally evaluated by the eye diagram and bit-error-rate test for a 2.5-Gbps lightwave transmission system. The results show that the eye diagram and power penalty caused by the radiated interference of the plastic transceiver modules are dependent on the EMS. The plastic transceiver modules with the more weight percentage of the CNTs exhibit a higher SE, and hence show effective EMS performance, a better mask margin, and a lower power penalty. The likely cause for effective EMS performance with higher weight percentage CNTs of the plastic transceiver modules is due to the high-aspect ratios of CNTs, more structural to form overlapping conductive networking to provide high SE. Therefore, the CNT composites with their high SE are suitable for packaging high-performance EMS optical transceiver modules used in fiber to the home (FTTH) lightwave transmission systems

High-performance and low-cost 10Gbps coaxial DFB laser module packaging by conventional TO-Can materials and processes

The high-performance and low-cost 10Gbps coaxial DFB laser module packaging by conventional TO-Can materials and processes are developed and fabricated. The laser module has a built-in matching resistor to reduce the resonant phenomenon. In order to optimize the modules performance, detailed equivalent circuit model is established to investigate both the DFB laser diode and the coaxial package comprehensively. After a proper design and fabrication, this uncooled 10Gbps laser module could operate at a high temperature up to 105degC and maintain an eye mask margin above 28% in the full operational temperature range to meet the stringent requirements of 10Gbps Ethernet for long reach applications. Previously, the high-performance 10Gbps coaxial laser modules have only been available by using complicated design, customized components, and specialized fabrication process

High-Performance and Low-Cost 40-Gb/s CWDM Optical Modules

High-performance and low-cost 40-Gb/s optical modules using four different wavelength uncooled 10-Gb/s distributed-feedback (DFB) lasers are proposed and demonstrated. The 40-Gb/s optical module was integrated with coarse wavelength division multiplexing (CWDM) thin-film filters which enabled four 10-Gb/s transmission channels output through a single fiber. The 10-Gb/s DFB laser was packaged by commercialized low-cost coaxial TO-Can technology. The results of the 40-Gb/s optical module showed that the output optical power was above -1 dBm per channel and the system power budget was 12 dB. The transmission distance with a single-mode fiber reached more than 30 km at a bit-error-rate of 10-9. Compared with conventional 40-Gb/s optical modules, the module is easy to fabricate and is low cost. This proposed high-performance 40-Gb/s CWDM optical module demonstrates not only the feasibility of a 30 km transmission, but also shows the low-cost possibility of ensuring the application of WDM-passive optical network fiber-to-the-home systems.

A 40-Gb/s Optical Module Using 4-Channel WDM TOSA for Access Network Applications

A 40-Gb/s optical module using WDM TOSAs for access network applications has been fabricated and demonstrated. This compact optical module was integrated by three thin-film WDM filters and four uncooled LX4 wavelength compatible DFB laser diodes. The output optical power was measured above -6 dBm with a clear 10-Gb/s transmission eye diagram. Due to the low dispersion characteristic of conventional single mode fiber at the LX4 wavelength, this module was expected to be able to transmit the signal up to 10 km and served as a cost-effective solution for 40-Gb/s transmission.

A high electromagnetic immunity plastic composite package for a 10-gb/s optical transceiver module

A high electromagnetic immunity and low-cost plastic package for a 10-Gb/s optical transceiver module is developed by using a woven carbon-fiber epoxy composite (WCEC). The WCEC package with a thickness of 1.0 mm and 4.8% carbon fiber has a shielding effectiveness (SE) performance of 60 dB at 10 GHz as the package is grounded to the system ground, and the SE can reach approximately 38 dB for the realistic packaged module operated at 10 Gb/s. In addition, the excellent electromagnetic immunity of the package is demonstrated by the eye patterns and the bit-error-rate (BER) test. Under the interference of the radiated noise, the package housing significantly improves the jitter and mask margin performance of the 10-Gb/s signals. Compared with an unpackaged module, it is found that over 4 dB of optical power can be gained to keep the BER at 10-12 for the packaged optical transceiver modules. This proposed package is suitable for use in low-cost 10-Gb/s lightwave transmission systems with excellent electromagnetic susceptibility (EMS) performance

High-power laser module with high coupling wedge-shaped fiber

High-power laser module with multi-mode passive fiber is proposed and fabricated. The measured maximum coupling of the module was up to 91.9% by using an optimized 30deg angle of the wedge-shaped fiber.

A 40Gb/s bidirectional CWDM-PON system for metro/access applications

A high capacity CWDM-PON system has been proposed and demonstrated experimentally. 8 wavelengths have been transmitted at a 10 km single-mode fiber successfully. This system enables the maximum subscribing bit-rate to 10 Gb/s for a client.

High-temperature (350°C) glass phosphor layer for converted white light-emitting diodes

The high-temperature operation up to 350°C of glass phosphor layer for using in converted white light-emitting diodes is demonstrated. The results showed that the phosphor-converted white light-emitting diode (PC-WLEDs) maintained good thermal stability in lumen, chromaticity, and transmittance characteristics at the high temperature up to 350°C. The lumen degradation, chromaticity shift, and transmittance loss in glass based high-power PC-WLEDs under thermal aging at 150, 250, 350, and 450°C are presented and compared with the silicone based high-power PC-WLEDs under thermal aging at 150 and 250°C. The result clearly indicated that the glass based PC-WLEDs exhibited better thermal stability in lumen degradation, chromaticity shift, and transmittance loss than the silicone based PC-WLEDs. The advantages of glass doped encapsulation in high temperature PC-WLEDs could be arisen from the material property of glass transition temperature 567°C higher than silicone of 150°C. These newly developed high-temperature glass based PC-WLEDs are essentially critical to the application of LED modules in the area where the high-power, high-temperature, and absolute reliability are required for use in the next-generation solid-state lighting.