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

16 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

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

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  • Cite this

    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, 34(3), 1038-1046. [7355290]. https://doi.org/10.1109/JLT.2015.2508758