No abstract

According to the numerical analysis of power reflective spectra of waveguide Michelson interferometers, the temperature sensing of waveguide S01 Michelson interferometer can improve at least 20 times than traditional fiber Bragg grating temperature sensor. Moreover, the S01 waveguide interferometer sensor we designed presents high sensitivity than pure single waveguide Bragg grating sensor and fiber Bragg grating sensor by adjusting the length of the two interferomertric arms. The full width of half maximum (FWHM) of the frequency responses of passband of SOT waveguide Michelson interferometer can be designed smaller than fiber and waveguide Bragg grating sensors for sensitivity improvement.

No abstract

With the fast expansion of internet usage, the demand of 10Gb/s transmission optoelectronic devices for local-area-network (LAN) and storage-area-network (SAN) is increasing. The key issues of these applications are to improve the cost, manufacturability, and reliability of optoelectronic devices in high speed access transmission. The authors demonstrate a low cost, highly manufacturable and thermally stable mini-flat transmitter and TO-Can optical sub-assembly for 10Gb/s Ethernet applications. The incumbent active alignment process for chip-to-fiber coupling has many disadvantages in terms of process latitude, manual labor, and yield. The assembly yield of conventional LD chip on silicon optical bench coupled to a single mode fiber is quite low due to limited optical alignment tolerance [1�3]. We believe that to improve the manufacturability with higher yield and lower cost an advanced passive alignment technology is the solution. We showed in this study, a novel two lens semi-passive alignment structure of 10Gb/s SC receptacle type optical mini-flat transmitter can exhibit 30% more coupling efficiency in a ±lOum alignment deviation. A high resistivity silicon optical bench (lkQfcm) and pressure-free bonding technique with an electroplated AuSn solder are adopted to guarantee the transmitted performance in high frequency operation as shown in Fig. 1. Fig. 2 shows the photography of SC receptacle type and pigtail type lOGb/s mini-flat transmitter developed in this study. It is 13.2 x 7.4 x 4.34mm in size, which is 1/3 the volume of butterfly module. The back to back eye diagram of 10Gb/s direct modulation transmitter operated with 1O .3125Gb/s Pseudo-Random-Binary -Sequence (PRBS) 2 31 _1 pattern is also evaluated in Fig. 3. And exhibits an open and clear eye diagram complete accomplished the eye template of lOGE with 30% margin. The response of monitor PD is also examined up to 80% by mirror coating on silicon V-groove. The 10Gb/s 13lOnm mini-flat transmitter developed in this paper has demonstrated excellent performance for future high speed applications. transmitter with 30% mask margin at room temperature. The characteristic temperature of a laser diode determines the thermal stability. The high band-gap offset InGaAlAs laser diode is adopted to approach the uncooled aim with its high characteristic temperature. The lOGb/s 13lOnm InGaAlAs mini-flat transmitter is measured at 80°C case temperature to verify thermal stability in high 0-7803-8557-8/04/$20.00©2004 IEEE 511 temperature. The eye diagram of 10Gb/s transmitter operated at 80°C case temperature with 1O .3125Gb/s PRBS 2 31 _1 pattern is tested and accomplished the eye mask as shown in Fig. 4. Finally, the reliability tests of lOGb/s mini-flat transmitter are performed. The reliability data indicate that the optical alignment of these modules are stable and observed essentially low variations in optical coupling as a result of 1000 hours damp heat duration. TO-Can package is also a way to reduce cost of 10Gb/s optical assembly. However, the signal integ...

With the drastic expansion of internet usage, the demand of 10Gb/s transmission optoelectronic devices for local-area-network (LAN) and storage-area-network (SAN) are increasing. The key issues of these applications are to improve cost, manufacturability and reliability of optoelectronic devices in high speed transmission. The authors have demonstrated extremely low cost, high manufacturability and thermal stability optical front-end for 10Gb/s Ethernet applications in this paper. High performance and high sensitivity of 10Gb/s transmitter optical sub-assembly (TOSA) and receiver optical sub-assembly (ROSA) with TO-Can packages are discussed and demonstrated to overcome the critical points in high speed applications, respectively. Moreover, 10km interconnection of 10Gb/s optical front-end without isolated elements inside are also proved to be error free at 10.3 125Gb/s. In order to improve the signal integrity and manufacturability of 10Gb/s OSA in small form factor transceiver modules assembly, the authors also integrate high speed flex board and OSA package to extend the signal path, and to minimize the effect of crosstalk in modules.Furthermore, the integration of flex board and OSA package more release the difficulties in conjunction OSA and electrical sub-assembly (ESA) in module to fulfill the request of 10Gb/s transceivers' Multi-Source Agreement (MSA).The performance of temperature stabilized TOSA over wide case temperature range is also experimented. The optical eye diagram of 10Gb/s TOSA developed in this study showing excellent eye quality passing 10Gb/s Ethernet mask test between 0°C to 85°C.