Title :
FM and FSK response of tunable two-electrode DFB lasers and their performance with noncoherent detection
Author :
Willner, A.E. ; Kuznetsov, M. ; Kaminow, I.P. ; Stone, J. ; Stulz, L.W. ; Burrus, C.A.
Author_Institution :
AT&T Bell Lab., Holmdel, NJ, USA
Abstract :
Two-electrode distributed-feedback (DFB) lasers show promise for combining high speed and frequency tunability for frequency-division-multiplexed-frequency-shift-keyed (FDM-FSK) networks. The FM and FSK responses of such lasers have been measured up to modulation frequencies of approximately 1 GHz. Using these lasers in a noncoherent detection system in which a fiber Fabry-Perot tunable optical filter converts an FSK signal into an amplitude-shift-keyed (ASK) format, a 10/sup -9/ BER was observed up to 1 Gb/s. Nonuniform FM response and consequent tone broadening of the optical FSK spectra can lead to system power penalties due to optical-filtering effects. Thus, for a given FM response, the behavior of these lasers in FSK optical systems can be projected.<>
Keywords :
distributed feedback lasers; frequency modulation; frequency shift keying; laser tuning; optical communication equipment; optical modulation; semiconductor junction lasers; 1 Gbit/s; ASK format; FDM-FSK networks; FM response; FSK response; amplitude-shift-keyed; distributed-feedback; fiber Fabry-Perot tunable optical filter; frequency tunability; frequency-division-multiplexed-frequency-shift-keyed; high speed; modulation frequencies; noncoherent detection; optical-filtering effects; performance; system power penalties; tone broadening; tunable two-electrode DFB lasers; Amplitude shift keying; Bit error rate; Fabry-Perot; Fiber lasers; Frequency measurement; Frequency modulation; Frequency shift keying; High speed optical techniques; Optical filters; Tunable circuits and devices;
Journal_Title :
Photonics Technology Letters, IEEE
