Compact Hybrid Integrated 100-Gb/s Transmitter Optical Sub-Assembly Using Optical Butt-Coupling between EADFB Lasers and Silica-Based AWG Multiplexer

Takaharu Ohyama, Yoshiyuki Doi, Wataru Kobayashi, Shigeru Kanazawa, Kiyoto Takahata, Atsushi Kanda, Takeshi Kurosaki, Takuya Tanaka, Tetsuichiro Ohno, Hiroaki Sanjoh, Toshikazu Hashimoto

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A compact hybrid-integrated 100 Gb/s (4 lane × 25.78125 Gb/s) transmitter optical sub-assembly (TOSA) has been developed for a 100 Gb/s transceiver for 40-km transmission over a single-mode fiber. The TOSA has a simple configuration in which four electro-absorption modulator-integrated distributed feedback (EADFB) lasers are directly attached to the input waveguide end-face of a silica-based arrayed waveguide grating (AWG) multiplexer without bulk lenses. To achieve a high optical butt coupling efficiency between the EADFB lasers and the AWG multiplexer, we integrated a laterally tapered spot-size converter (SSC) for the EADFB laser and employed a waveguide with a high refractive index difference of 2.0% for the AWG multiplexer. By optimizing the laterally tapered SSC structure, we achieved a butt-coupling loss of less than 3 dB, which is an improvement of around 2 dB compared with a laser without an SSC structure. We also developed an ultracompact AWG multiplexer, which was 6.7 mm × 3.5 mm in size with an insertion loss of less than 1.9 dB. We achieved this by using a Mach-Zehnder interferometer-synchronized configuration to obtain a low loss and wide flat-top transmission filter spectra. The TOSA body size was 19.9 mm (L) × 6.0 mm (W) × 5.8 mm (H). Error-free operation was demonstrated for a 40-km transmission when all the lanes were driven simultaneously with a low EA modulator driving voltage of 1.5 V at an operating temperature of 55 °C.

Original languageEnglish
Article number7355290
Pages (from-to)1038-1046
Number of pages9
JournalJournal of Lightwave Technology
Volume34
Issue number3
DOIs
Publication statusPublished - 2016 Feb 1
Externally publishedYes

Fingerprint

distributed feedback lasers
transmitters
modulators
assembly
gratings
silicon dioxide
waveguides
converters
transmitter receivers
Mach-Zehnder interferometers
configurations
operating temperature
insertion loss
lenses
refractivity
filters
fibers
electric potential
lasers

Keywords

  • 100 Gbit/s Ethernet
  • AWG multiplexer
  • EADFB laser
  • hybrid-integration
  • spot-size converter
  • TOSA

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Compact Hybrid Integrated 100-Gb/s Transmitter Optical Sub-Assembly Using Optical Butt-Coupling between EADFB Lasers and Silica-Based AWG Multiplexer. / Ohyama, Takaharu; Doi, Yoshiyuki; Kobayashi, Wataru; Kanazawa, Shigeru; Takahata, Kiyoto; Kanda, Atsushi; Kurosaki, Takeshi; Tanaka, Takuya; Ohno, Tetsuichiro; Sanjoh, Hiroaki; Hashimoto, Toshikazu.

In: Journal of Lightwave Technology, Vol. 34, No. 3, 7355290, 01.02.2016, p. 1038-1046.

Research output: Contribution to journalArticle

Ohyama, T, Doi, Y, Kobayashi, W, Kanazawa, S, Takahata, K, Kanda, A, Kurosaki, T, Tanaka, T, Ohno, T, Sanjoh, H & Hashimoto, T 2016, 'Compact Hybrid Integrated 100-Gb/s Transmitter Optical Sub-Assembly Using Optical Butt-Coupling between EADFB Lasers and Silica-Based AWG Multiplexer', Journal of Lightwave Technology, vol. 34, no. 3, 7355290, pp. 1038-1046. https://doi.org/10.1109/JLT.2015.2508758
Ohyama, Takaharu ; Doi, Yoshiyuki ; Kobayashi, Wataru ; Kanazawa, Shigeru ; Takahata, Kiyoto ; Kanda, Atsushi ; Kurosaki, Takeshi ; Tanaka, Takuya ; Ohno, Tetsuichiro ; Sanjoh, Hiroaki ; Hashimoto, Toshikazu. / Compact Hybrid Integrated 100-Gb/s Transmitter Optical Sub-Assembly Using Optical Butt-Coupling between EADFB Lasers and Silica-Based AWG Multiplexer. In: Journal of Lightwave Technology. 2016 ; Vol. 34, No. 3. pp. 1038-1046.
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AU - Kanda, Atsushi

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