We demonstrate a new configuration for an optoelectronic self-injection-locked (SIL) oscillator, where a part of the electrical output signal is self-injected after passing through a long optical delay line for output phase-noise reduction. The SIL oscillator consists of an electrical free-running oscillator and a long optical feedback loop. For the compact and low cost configuration, the free-running oscillator is realized with an InP HPT-based monolithic oscillator and electrical-to-optical conversion is carried out by two low-speed and low-cost laser diodes. With this new configuration, we achieve more than 55-dB phase-noise reduction at 10-kHz frequency offset from the center frequency of about 10.8 GHz by injecting 8-dBm optical signals without using any high-speed optoelectronic components.
Bibliographical noteFunding Information:
Manuscript received December 3, 2007; revised April 10, 2008. The work of K.-H. Lee, J.-Y. Kim, and W.-Y. Choi was supported by the Basic Research Program of the Korea Science and Engineering Foundation. K.-H. Lee, J.-Y. Kim, and W.-Y. Choi are with the Department of Electrical and Electronic Engineering, Yonsei University, Seoul 120-749, Korea (e-mail: firstname.lastname@example.org). H. Kamitsuna, M. Ida, and K. Kurishima are with the NTT Photonics Laboratories, NTT Corporation, Kanagawa 243-0198, Japan (e-mail: Kamituna@aecl. ntt.co.jp). Color versions of the figures in this letter are available online at http://ieeex-plore.ieee.org. Digital Object Identifier 10.1109/LPT.2008.925189 Fig. 1. Compact and low cost configuration for an optoelectronic SIL oscillator based on a monolithic HPT oscillator and low cost optical components.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering