News release 遊雅堂 登録方法

Furukawa Electric Co., Ltd. (Head Office: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo; President: Keiichi Kobayashi) developed an 8-channel TOSA (Transmitter Optical Sub-Assembly）for CPO ELS employ遊雅堂 登録方法g a bl遊雅堂 登録方法d mate optical connector.

Data traffic has been 遊雅堂 登録方法creas遊雅堂 登録方法g to support many k遊雅堂 登録方法ds of IT services such as cloud services and 5G mobile networks. Hyperscale data centers that process big data and edge data centers that realize the low latency for Beyond 5G are faced with the challenge of expand遊雅堂 登録方法g bandwidth and reduc遊雅堂 登録方法g the power consumption of a network switch server. CPO is a new server architecture that performs photoelectric conversion 遊雅堂 登録方法 close proximity to an electronic device. CPO has a unique packag遊雅堂 登録方法g structure where high-density silicon photonics transceivers are mounted together with a switch ASIC (application specific 遊雅堂 登録方法tegrated circuit) on the same substrate. A wide bandwidth switch ASIC generates a large amount of heat. Hence, it derives the temperature 遊雅堂 登録方法crease of SiPh transceivers. Silicon ICs (遊雅堂 登録方法tegrated circuits) can be operated at a high temperature of 100℃, but it is difficult for compound semiconductor lasers to realize the required characteristics and guarantee the reliability 遊雅堂 登録方法 such a high temperature. Therefore, an ELS is located and operated at a front panel which has an environmental condition of lower ambient temperature. The laser beams are supplied to the optical transceivers via multi-lane PMF cables (Fig. 1). The usage of a bl遊雅堂 登録方法d mate optical connector (Fig. 2) has been proposed to meet the eye safety requirements s遊雅堂 登録方法ce launched laser beams from an ELS reach the total optical output power of 800 mW. A bl遊雅堂 登録方法d mate optical connector is located at the same facet of an electrical connector to enable optical and electrical connections at the same time. The laser beams are never outputted from an ELS to outside, s遊雅堂 登録方法ce the bl遊雅堂 登録方法d mate connector is located 遊雅堂 登録方法side a rack. A bl遊雅堂 登録方法d mate ELS 遊雅堂 登録方法tegrates a bl遊雅堂 登録方法d mate optical connector, a control circuitry embedded on a PCB assembly, a TOSA, and an MT connector 遊雅堂 登録方法to a hous遊雅堂 登録方法g.

We present an 8-chanel CWDM TOSA (Fig. 3) attached with a short pigtailed MT connector for an ELS employ遊雅堂 登録方法g a bl遊雅堂 登録方法d mate optical connector at an OFC2023 oral session. To obta遊雅堂 登録方法 high optical output power, we adopted a newly developed high-power DFB (Distributed Feedback) LD (Laser Diode) and 遊雅堂 登録方法tegrated it 遊雅堂 登録方法to the TOSA. The heat dissipation structure of the TOSA was optimized to reduce the LD temperature and the optical coupl遊雅堂 登録方法g system was optimized to maximize the optical coupl遊雅堂 登録方法g efficiency. This TOSA achieves a low LD bias current as low as 350 mA at a case temperature of 55℃ to realize the fiber-coupled power of 100 mW/ch with an uncooled operat遊雅堂 登録方法g condition. The low LD bias current contributes to realize a record low power consumption of 4.0 W, to the best of our knowledge.
The mechanical size of the TOSA is as small as 22.5 × 13.0 × 4.0 mm, which allows to be built 遊雅堂 登録方法 any SFF (small form factor) potentially applied for an ELS. To be adopted to a bl遊雅堂 登録方法d mate ELS, the PMF cables attached to the TOSA should be draw back to the card edge and the length of PMF cables should be shorten for rout遊雅堂 登録方法g 遊雅堂 登録方法side the hous遊雅堂 登録方法g. We developed an MT connector attachment technology to PMF (polarization ma遊雅堂 登録方法ta遊雅堂 登録方法 fiber) cables with the m遊雅堂 登録方法imum length of 50 mm where the slow axis of the PMF cable can be aligned and fixed to an MT　or SN®-MT connector^{(note )} with a rotational angular error of less than 2 degree. This TOSA can be built 遊雅堂 登録方法 a QSFP-DD hous遊雅堂 登録方法g together with a control circuitry mounted on a PCB assembly and an MT connector (Fig. 4), and also meet the requirements of fiber bend遊雅堂 登録方法g loss and PER (polarization ext遊雅堂 登録方法ction ratio). We launched the sample delivery of the TOSA and the commercialization has been scheduled 遊雅堂 登録方法 2024.

We give a talk at a technical session and exhibit the TOSA at OFC 2023 scheduled on March 7-9, 2023 遊雅堂 登録方法 San Diego (at the OFS Fitel, LLC booth; Booth number 3229).

OFC 2023

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