[1] KOJIMA K,KYUMA K,NAKAMURA T.Analysis of the spectral linewidth of distributed feedback laser diodes[J].Journal of Lightwave Technology,1985,3(5):1048-1055.

[4] HENRY C H.Theory of the linewidth of semiconductor lasers[J].IEEE Journal Of Quantum Electronics,1982,18 (2):259-264.

[5] LIOU K-Y,DUTTAN K,BURRUSC A.Linewidth-narrowed distributed feedback injection lasers with long cavity length and detuned Bragg wavelength[J].Applied Physics Letters,1987,50(9):489-491.

[6] SCHREINER R,WIEDMANN J,COENNING W,et al.Fabrication approach for antiphase narrow linewidth complex coupled 1.55 μm DFB lasers[J].Electronics Letters,1999,35(2):146-148.

[7] INABA Y,KITO M,OHYA J,et al.Gain-coupled DFB lasers with reduced optical confinement for narrow spectrallinewidth[C]//IEEE International Semiconductor Laser Conference,1998:71-72.

[8] BISSESSUR H,STARCK C,EMERY J-Y,et al.Very narrow -linewidth (70 kHz) 1.55 μm strained MQW DFB lasers[J].Electronics Letters,1992,28(11):998-999.

[9] OGITA S,KOTAKI Y,MATSUDA M,et al.Long -cavity multiple-phase-shift distributed feedback laser diode for linewidth narrowing[J].Journal of Lightwave Technology,1990,8(10):1596-1604.

[10] OKAI M,SUZUKI M,TUYOSHI T,et al.Corrugation-pitchmodulated distributed feedback lasers with ultranarrow spectral linewidth[J].Japanese Journal of Applied Physics,Part 1,1994,33(5A):2563-2570.

[11] SMITH G M,HUGHES J S,LAMMERT R M,et al.Very narrow linewidth asymmetric cladding InGaAs-GaAs ridge waveguide distributed Bragg reflector lasers[J].IEEE Photonics Technology Letters,1996,8(4):476-478.