Effect of laser frequency offset on optical minimum-shift keying transmission system

As a special case of continuous phase frequency-shift-keying (FSK), minimum-shift keying (MSK) exhibits some different properties compared with the traditional optical phase modulation formats, such as return-to-zero (RZ) differential-phase-shift-keying (DPSK) and differential-quadrature-phase-shift-keying (DQPSK). In this paper, we investigated the receiver performance degradation caused by laser frequency offset between laser frequency and delay interferometer (DI) phase, which is found to be the most critical impairment for the receiver performance in a practical optical phase modulated system. Results show that MSK system is about double times and six times more robust to frequency offsets than RZ-DPSK and RZ-DQPSK systems operating at the same 10Gb/s bit rate, respectively.

[1]  A.H. Gnauck,et al.  Optical phase-shift-keyed transmission , 2005, Journal of Lightwave Technology.

[2]  E.A. Swanson,et al.  High sensitivity optically preamplified direct detection DPSK receiver with active delay-line stabilization , 1994, IEEE Photonics Technology Letters.

[3]  Hoon Kim,et al.  A novel frequency-offset monitoring technique for direct-detection DPSK systems , 2006, IEEE Photonics Technology Letters.

[4]  N. Hanik,et al.  Robustness of DPSK direct detection transmission format in standard fibre WDM systems , 2000 .

[5]  Hoon Kim,et al.  Degradations in balanced DPSK receivers , 2003, IEEE Photonics Technology Letters.

[6]  R.-J. Essiambre,et al.  Advanced Modulation Formats for High-Capacity Optical Transport Networks , 2006, Journal of Lightwave Technology.

[7]  B. Krauskopf,et al.  Proc of SPIE , 2003 .

[8]  Yi Dong,et al.  Optical minimum-shift keying modulator for high spectral efficiency WDM systems , 2005 .

[9]  R.A. Griffin.  Integrated DQPSK transmitters , 2005, OFC/NFOEC Technical Digest. Optical Fiber Communication Conference, 2005..

[10]  Peter J. Winzer,et al.  Robustness to laser frequency offset in direct-detection DPSK and DQPSK systems , 2003 .

[11]  Weisheng Hu,et al.  Generation of 16-Gb/s MSK signal using a single 10-GHz SSB modulator and simplified encoder/decoder , 2006, 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference.