Narrow spectral linewidth under wavelength tuning in thermally tunable super-structure-grating (SSG) DBR lasers

Narrow spectral linewidth characteristics are demonstrated in thermally wavelength tunable super-structure-grating distributed Bragg reflector (SSG-DBR) InGaAsP-InP lasers. SSG reflectors were fabricated with a multiple-phase-shift insertion method using electron-beam lithography. The phase distributions of the SSG's were optimized to obtain uniform reflection peaks. Incorporating thin-film Pt heaters into the lasers enables us to tune the lasing wavelength by the thermal effect. The device has a wide quasi-continuous tuning range of 40 nm with CW operation at room temperature. The spectral linewidths, frequency fluctuations, and tuning speed in thermal wavelength tuning were studied compared with those in electrical tuning. Experimental results showed that thermal tuning does not influence frequency fluctuations and spectral linewidths, but the tuning speed was slow. Narrow spectral linewidths below 400 kHz were achieved in a wide quasi-continuous tuning range of 40 mm. >

[1]  Hiroyuki Ishii,et al.  FDM optical switching of 16 channels at 5 Gbit/s data rate using an SSG DBR laser and arrayed-waveguide grating , 1994 .

[2]  M. Kuznetsov,et al.  Frequency tuning characteristics and WDM channel access of the semiconductor three-branch Y3-lasers , 1994, IEEE Photonics Technology Letters.

[3]  Gert Laube,et al.  6 THz Range Frequency Conversion of 2.5 Gbit/s Signals by a 1.55 /spl mu/m MQW Based Widely Tunable Y-Laser , 1992, 13th IEEE International Semiconductor Laser Conference.

[4]  U. Koren,et al.  A DBR laser tunable by resistive heating , 1992, IEEE Photonics Technology Letters.

[5]  Thomas L Koch,et al.  High performance tunable 1.5 μm InGaAs/InGaAsP multiple quantum well distributed Bragg reflector lasers , 1988 .

[6]  Yuzo Yoshikuni,et al.  Broad range (34nm) quasi-continuous wavelength tuning in super-structure-grating DBR lasers , 1994 .

[7]  Hiroyuki Ishii,et al.  Multiple-Phase-Shift Super Structure Grating DBR Lasers , 1993 .

[8]  O. Ishida.  Delayed-self-heterodyne measurement of laser frequency fluctuations , 1991 .

[9]  L. Coldren,et al.  Theory, design, and performance of extended tuning range semiconductor lasers with sampled gratings , 1993 .

[10]  Moshe Tur,et al.  Fast Wavelength-Switching of Laser Transmitters and Amplifiers , 1990, IEEE J. Sel. Areas Commun..

[11]  Kohroh Kobayashi,et al.  Tuning ranges for 1.5 μm wavelength tunable DBR lasers , 1988 .

[12]  S. Nilsson,et al.  74 nm wavelength tuning range of an InGaAsP/InP vertical grating assisted codirectional coupler laser with rear sampled grating reflector , 1993, IEEE Photonics Technology Letters.

[13]  N. Chinone,et al.  Tunable DFB laser with a striped thin-film heater , 1992, IEEE Photonics Technology Letters.

[14]  H. Ishii,et al.  Broad-range wavelength-tunable superstructure grating (SSG) DBR lasers , 1993 .

[15]  P.-J. Rigole,et al.  Complete single mode wavelength coverage over 40 nm with a super structure grating DBR laser , 1995 .

[16]  H. Ishikawa,et al.  Spectral characteristics of a three-section wavelength-tunable DBR laser , 1989 .

[17]  T. Kikugawa,et al.  A DBR laser employing passive-section heaters, with 10.8 nm tuning range and 1.6 MHz linewidth , 1993, IEEE Photonics Technology Letters.

[18]  H. Ishii,et al.  Characteristics of super structure grating (SSG) DBR lasers under broad range wavelength tuning , 1993, IEEE Photonics Technology Letters.

[19]  R. Alferness,et al.  Broadly tunable InGaAsP/InP laser based on a vertical coupler filter with 57‐nm tuning range , 1992 .

[20]  Nori Shibata,et al.  Performance of four channel FDM crossconnect switching without bit loss , 1993 .

[21]  U. Koren,et al.  Discretely-tuned N-frequency laser for packet switching applications based on WDM , 1991 .