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Quasi-light Storage for Optical Data Packets
07:45

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Published on: February 6, 2014

Optical isolator using two tandem phase modulators.

Christopher R Doerr1, Nicolas Dupuis, Liming Zhang

  • 1Bell Laboratories, Alcatel-Lucent, 791 Holmdel Road, Holmdel, New Jersey 07733, USA. crdoerr@alcatel‑lucent.com

Optics Letters
|November 4, 2011
PubMed
Summary
This summary is machine-generated.

We developed an integrated optical isolator using InP phase modulators. This device achieves 11 dB carrier isolation and 2.3 dB insertion loss, enabling monolithic integration with lasers without magnetic fields.

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Area of Science:

  • Photonics and optoelectronics
  • Semiconductor device physics

Background:

  • Optical isolators are crucial for preventing back reflections in photonic integrated circuits.
  • Existing isolators often rely on bulky magnetic materials or complex fabrication processes.
  • Monolithic integration of isolators with lasers remains a significant challenge.

Purpose of the Study:

  • To propose and demonstrate a novel, compact optical isolator integrated onto an Indium Phosphide (InP) platform.
  • To achieve high isolation performance without external magnetic fields.
  • To enable seamless integration with semiconductor lasers.

Main Methods:

  • Utilizing two phase modulators in series on an InP chip.
  • Driving the phase modulators with a single-frequency signal in quadrature.
  • Characterizing the device performance, including carrier isolation and insertion loss.

Main Results:

  • Demonstrated a carrier isolation of 11 dB.
  • Achieved an excess insertion loss of 2.3 dB.
  • The proposed device shows no theoretical effect on the forward signal.

Conclusions:

  • The integrated optical isolator in InP offers a promising solution for compact photonic systems.
  • This approach eliminates the need for magnetic materials, simplifying integration.
  • The isolator is suitable for monolithic integration with lasers, advancing photonic integrated circuit design.