1.25Gb/s WDM bi directional transceiver module using DFB-LD and PLC with spot-size conversion region

Oguro, Masato; Goto, A.; Kitamura, N.; Fukutomi, Y.; Sakamoto, Y.; Masuta, T.; Tamura, Toshifumi

doi:10.1109/ectc.2002.1008112

Cited by 11 publications

(4 citation statements)

References 4 publications

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“…Coupling with focusing lenses of different mechanisms is intolerant of small misalignment (0.5µm) between the laser and waveguide tip. M. Oguro et al from NEC used mode size converter to couple light from laser diode to a 4.5µm (height) * 8µm (width) planar waveguide with 6.5dB coupling loss [3]. Bookham claimed a tapered rib waveguide to transit light from relatively large cross-section waveguide, eg.…”

Section: Introductionmentioning

confidence: 99%

Taper couplers for coupling between laser and silicon waveguide with large allowable tolerance

Zhang

Chandrappan

et al. 2008

SPIE Proceedings

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A taper coupler with multimode input and single mode output is presented for coupling between edge emitting laser diode and silicon waveguide. The tapered coupler structure is optimized and tolerance for laser diode placement is studied. A typical coupling efficiency of -2dB is achieved from laser diode to silicon waveguide. With tolerance of +/-4µm laterally or vertically, the variation of the coupling efficiency is about 3dB. The tolerance is large compared with other methods. Tilting angle at laser diode and the small gap between tapered coupler and silicon waveguide also affect the overall coupling. From our studies, horizontal and vertical offsets are more critical for laser diode placement in order to have a good coupling. The new design can be applied to photonics packaging because it will make passive assembly easier by having larger tolerance for packaging compared with the conventional method with lens.

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Section: Introductionmentioning

confidence: 99%

Taper couplers for coupling between laser and silicon waveguide with large allowable tolerance

Zhang

Chandrappan

et al. 2008

SPIE Proceedings

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“…Therefore, the laser, lens and fiber placement accuracies are very severe and active alignment is necessary for the laser and fiber assembly. Tapererd coupler provides modes conversion through an adiabatic modal transformation thus resulting in small coupling loss [3] [4] [5]. However, to match with laser spot size and maintain single mode, the adiabatic modal converter has a small input region which results in small alignment tolerance between laser and taper structure.…”

Section: Introductionmentioning

confidence: 99%

Design of taper coupler for effective laser and single mode fiber coupling with large tolerance

Zhang¹,

Pamidighantam²,

Lau³

et al. 2007

Optoelectronic Materials and Devices II

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A new method of coupling the light from a laser diode to a Single Mode Fiber (SMF) with large alignment tolerances and without using coupling lenses is presented. A pseudo vertical tapered coupler is designed for light coupling between laser diode and single mode fiber. It has a large input aperture which is about 100 times the size of the laser waveguide cross-section. The tapered coupler provides single mode output and matches the mode size with the single mode fiber . The tapered coupler is fabricated on a silicon optical bench and is located between the laser and the fiber through the silicon micrfabrication process. The misalignment between the fiber and taper coupler can be very small since this is controlled by high precision silicon optical bench patterning processes. The coupler relaxes the laser diode placement accuracies and eliminates the need for a coupling lens. Design Studies showed that the tolerance between the laser diode and taper coupler can be more than +/-5µm misalignment at x-y, and +/-0.5degree tilting angle tolerance and the fabricated assembly results are encouraging with good placement tolerances and coupling efficiency. The laser to single mode fiber coupling tolerances is greatly improved and passive alignment for laser and single mode fiber is realized. The technology can be useful for multi channel optical assembly where significant device and process cost saving can be achieved and is suitable for functional integration for silicon photonics.

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“…The conventional wavelength-division multiplexers (WDMs) formed on a PLC platform are TFF-embedded WDMs [4−6] that generally experienced difficulties in forming a narrow trench and embedding the TFF chip into the trench without tilting. To address this problem, a WDM structure, in which the TFF chip is attached to the sidewall of the PLC platform, has been applied to a diplex TRx module using two wavelength bands [7] . However, the costs of the TFF and the coupling between TFF and waveguide are still high.…”

mentioning

confidence: 99%

“…A 1310-nm spot-size converted (SSC) Febry-Perot LD on the LD carrier was integrated into the PLC platform to form a transmitter (Tx). Two receiving surface-illuminated PDs in pairs with a light detecting diameter of 50 µm each were vertically bonded to the PD carrier to face the sidewall of the PLC platform [7,11] , forming a digital and analog receiver (Rx). On the PDs carrier, a transimpedance amplifier (TIA), some microstrip lines, and glass ceramics were placed to form an electronic circuit configuration; this will amplify the weak current generated by the 1490-nm digital PD.…”

mentioning

confidence: 99%

一种基于Silica PLC混合集成的新型三向器的研制

et al. 2010

中国光学快报

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A new-style silica planar lightwave circuit (PLC) hybrid integrated triplexer, which can demultiplex 1490nm download data and 1550-nm download analog signals, as well as transmit 1310-nm upload data, is presented. It combines SiO2 arrayed waveguide gratings (AWGs) with integrated photodetectors (PDs) and a high performance laser diode (LD). The SiO2 AWGs realize the three-wavelength coarse wavelengthdivision multiplexing (CWDM). The crosstalk is less than -40 dB between the 1490-and 1550-nm channels, and less than -45 dB between 1310-and 1490-or 1550-nm channels. For the static performances of the integrated triplexer, its upload output power is 0.4 mW, and the download output photo-generated current is 76 µA. In the small-signal measurement, the upstream -3-dB bandwidth of the triplexer is 4 GHz, while the downstream -3-dB bandwidths of both the analog and digital sections reach 1.9 GHz.

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1.25Gb/s WDM bi directional transceiver module using DFB-LD and PLC with spot-size conversion region

Cited by 11 publications

References 4 publications

Taper couplers for coupling between laser and silicon waveguide with large allowable tolerance

Taper couplers for coupling between laser and silicon waveguide with large allowable tolerance

Design of taper coupler for effective laser and single mode fiber coupling with large tolerance

一种基于Silica PLC混合集成的新型三向器的研制

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1.25Gb/s WDM bi directional transceiver module using DFB-LD and PLC with spot-size conversion region

Cited by 11 publications

References 4 publications

Taper couplers for coupling between laser and silicon waveguide with large allowable tolerance

Taper couplers for coupling between laser and silicon waveguide with large allowable tolerance

Design of taper coupler for effective laser and single mode fiber coupling with large tolerance

一种基于Silica PLC混合集成的新型 三向器的研制

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一种基于Silica PLC混合集成的新型三向器的研制