Simple and high-accuracy integration for parallel optical subassembly with 120-Gbits/s data transmission

Hwang, Sung Hwan; Lim, Jung Woon; Rho, Byung Sup

doi:10.1117/1.3486205

Cited by 6 publications

(4 citation statements)

References 15 publications

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“…2(a) and 2(b), respectively. The alignment of the VCSELs/PDs is one of the most important factors that determine the final optical coupling efficiency; in fact, the overall alignment tolerance for the proposed Tx/Rx modules was found to be equivalently governed by the mounting accuracy of the VCSELs/PDs [10]. The design parameters for the proposed modules are: The VCSEL at λ = 850 nm has a beam divergence of 25°, and their constituent parts are made of polycarbonate with n = 1.569.…”

Section: Proposed Tx and Rx Modules And Their Designmentioning

confidence: 99%

“…Transmitter (Tx) and receiver (Rx) modules, requiring a low cost and a large volume production capability, are particularly suitable to the adoption of optical interconnects [4][5][6][7][8]. Toward this end, an optical sub-assembly (OSA) using vertical cavity surface emitting lasers (VCSELs) has been extensively studied [4,[8][9][10][11][12], in conjunction with plastic optical fibers (POFs) allowing for an easy handling [4,5,12]. For implementing those Tx/Rx modules, a plastic injection molding [4,6] and a passive assembly [4,[8][9][10] have been also actively researched in view of a low-cost volume production.…”

Section: Introductionmentioning

confidence: 99%

“…Toward this end, an optical sub-assembly (OSA) using vertical cavity surface emitting lasers (VCSELs) has been extensively studied [4,[8][9][10][11][12], in conjunction with plastic optical fibers (POFs) allowing for an easy handling [4,5,12]. For implementing those Tx/Rx modules, a plastic injection molding [4,6] and a passive assembly [4,[8][9][10] have been also actively researched in view of a low-cost volume production. Previously there have been reports on multi-channel modules using step-index POFs with a bit rate of 1.6 Gbps per channel [13], yet they did not accomplish a fully passive alignment based on a pick-and-place scheme.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ribbon plastic optical fiber linked optical transmitter and receiver modules featuring a high alignment tolerance

Lee¹,

Park²,

Cha³

et al. 2011

Opt. Express

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Ribbon plastic optical fiber (POF) linked four-channel optical transmitter (Tx) and receiver (Rx) modules have been proposed and realized featuring an excellent alignment tolerance. The two modules share a common configuration involving an optical sub-assembly (OSA) with vertical cavity surface emitting lasers (VCSELs)/photodetectors (PDs), and their driver ICs, which are integrated onto a single printed circuit board (PCB) substrate. The OSA includes an alignment structure, a beam router and a fiber guide, which were produced by using plastic injection molding. We have accomplished a fully passive alignment between the VCSELs/PDs and the ribbon POF by taking advantage of the alignment structure that serves as a reference during the alignment of the constituent parts of the OSA. The electrical link, which largely determines the operation speed, has been remarkably shortened, due to a direct wire-bonding between the VCSELs/PDs and the driver circuits. The light sources and the detectors can be individually positioned, thereby overcoming the pitch limitations of the ribbon POF, which is made up of perfluorinated graded-index (GI) POF with a 62.5 μm core diameter. The overall alignment tolerance was first assessed by observing the optical coupling efficiency in terms of VCSEL/PD misalignment. The horizontal and vertical 3-dB alignment tolerances were about 20 μm and 150 μm for the Tx and 50 μm and over 200 μm for the Rx, respectively. The VCSEL-to-POF coupling loss for the Tx and the POF-to-PD loss for the Rx were 3.25 dB and 1.35 dB at a wavelength of 850 nm, respectively. Subsequently, a high-speed signal at 3.2 Gb/s was satisfactorily delivered via the Tx and Rx modules over a temperature range of -30 to 70°C with no significant errors; the channel crosstalk was below -30 dB. Finally, the performance of the prepared modules was verified by transmitting a 1080p HDMI video supplied by a Bluelay player to an LCD TV.

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Section: Proposed Tx and Rx Modules And Their Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ribbon plastic optical fiber linked optical transmitter and receiver modules featuring a high alignment tolerance

Lee¹,

Park²,

Cha³

et al. 2011

Opt. Express

View full text Add to dashboard Cite

show abstract

“…For example, the optical coupling loss using the 45°‐titled mirror method is greater than −1.5 dB and high accurate alignment is required. Compared with these two methods, the 90°‐bend flexible PCB film method is a way to improve the coupling efficiency, since 90°‐electrical‐interconnection‐deflection of the flexible film enables direct optical coupling and provides simple and convenient integration between the optical subassembly and the electrical board. However, the assembly process of the optical components is quite complicate and the cost of flexible PCB is high.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of a small‐form transmitter optical subassembly for 100 Gbps short reach optical interconnect

Liu

Xue

et al. 2017

Micro & Optical Tech Letters

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A high-coupling-efficiency and convenient-integration transmitter optical subassembly for 25 Gbps small-form transceiver is developed in this paper. In the structure, the VCSEL is vertically mounted on the silicon substrate by the flip-chip method to enable direct and passive alignment with the fibers plugging in the fiber guide holes on the silicon substrate. By the optical simulation, the maximum coupling efficiency of VCSEL is 20.38 dB. The vertical electrical pads of the VCSEL are connected to the horizontal wire-bonding pads on silicon substrate by the 908-bend GS micro strip lines. Thus, the interconnection between the transmitter optical subassembly and the electrical PCB board is conveniently realized by the low-cost wire-bonding method. The electrical performance of the 908-bend GS micro strip lines on the optical subassembly is also evaluated by the 3D electromagnetic simulation. In order to verify the transmission performance of the transmitter optical subassembly, it is integrated with an electrical board using bonding wires, and then the optical performance of the transmitter is measured. By the measurement, the optical subassembly can operate up to 25 Gbps per channel.optical alignment, silicon optical bench, TOSA, 100 Gbps optical interconnect | I NT RODU CTI ONWith rapid development of the high data transmission capacity, the appearance of the optical interconnection attracts great attention and becomes a potential alternative for the copper interconnection, since it has the ability of suppressing EMI and the features of low loss and high bandwidth. Currently, the optical interconnection has been applied in most places of the computing system, including long-reach and short-reach optical interconnection. Unlike the long reach systems, short-reach optical interconnection is applied in the data processing centers, consumer electronics and so on, and it mainly focuses on the reduction of the cost, power consumption and volume of the optoelectronic system. 1-3 Based on these reasons, low-cost vertical cavity surface emitting laser (VCSEL) produced at a large scale is widely applied in the short-reach optical intercommunication and the small-form transceiver is a promising optical module for the reduction of the size.The small-form optical module requires a transmitter optical subassembly focusing on the optical alignment and the integration difficulty with the electrical board. Previously, a number of optical subassemblies have been researched using several alignment techniques, including 458-titled mirror, 908-bend flexible film, 908-bend fiber connector and direct optical-coupling method. The 458-tilted mirrors 4,5 and 908-bend fiber connector 6,7 methods are able to provide 908-beam-deflection and avoid the 908-electricalinterconnection-deflection, which is convenient for the interconnection between the optical chips and electrical chips. But some disadvantages still exist in these two methods. For example, the optical coupling loss using the 458-titled mirror method is greater than 21.5 dB and hig...

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Fabrication and performance analysis of a high-coupling-efficiency and convenient-integration optical transceiver

Liu

Xue

et al. 2017

Optoelectron. Lett.

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Simple and high-accuracy integration for parallel optical subassembly with 120-Gbits/s data transmission

Cited by 6 publications

References 15 publications

Ribbon plastic optical fiber linked optical transmitter and receiver modules featuring a high alignment tolerance

Ribbon plastic optical fiber linked optical transmitter and receiver modules featuring a high alignment tolerance

Design and fabrication of a small‐form transmitter optical subassembly for 100 Gbps short reach optical interconnect

Fabrication and performance analysis of a high-coupling-efficiency and convenient-integration optical transceiver

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