Quasicontinuous wavelength tuning in super-structure-grating (SSG) DBR lasers

Performance of Widely Tunable Multi-Quantum-Well and Bulk Laser Diodes and the Main Limiting Factors

“…In widely tunable TLDs the strongest effect on the output power performance is, however, due to the shapes of the AR net gain g net (λ) and the cavity mirror loss α m (λ) spectra and their mutual positioning with respect to the lasing cavity mode during tuning. Although, in the present paper we have demonstrated this point for a 3-section laser, the effect in question is universal and should be observed in TLDs with various designs of tuning sections [44]- [50]. For example, the 40-nm tuning range in both C-and L-band digital supermode DBR (DS-DBR) TLDs has been reported in [44] and [45], and the output power drop was about 30% when the laser is continuously tuned over each supermode (∼7 nm).…”

Performance of Widely Tunable Multi-Quantum-Well and Bulk Laser Diodes and the Main Limiting Factors

“…In widely tunable TLDs the strongest effect on the output power performance is, however, due to the shapes of the AR net gain g net (λ) and the cavity mirror loss α m (λ) spectra and their mutual positioning with respect to the lasing cavity mode during tuning. Although, in the present paper we have demonstrated this point for a 3-section laser, the effect in question is universal and should be observed in TLDs with various designs of tuning sections [44]- [50]. For example, the 40-nm tuning range in both C-and L-band digital supermode DBR (DS-DBR) TLDs has been reported in [44] and [45], and the output power drop was about 30% when the laser is continuously tuned over each supermode (∼7 nm).…”

Design of widely tunable semiconductor lasers and the concept of binary superimposed gratings (BSG's)

“…For that reason, the amplitudes of peaks in the Fourier spectrum are bigger than that of SG for the same length. As noted in [5], they decay with the number of channels as . Using the same criteria as in (6), the number of channels available with SSG may be found approximately from the equation 7Numerical adjustment of the grating phases (or pitch width) of the subsections makes it possible to construct a SSG with highly uniform amplitude of reflection peaks.…”

“…However, technological implementation of the SSG of desirable uniformity requires extremely precise lithography to reproduce the designed ultrafine grating phase shifts of each section correctly. Not surprisingly, the measured transmittance spectrum, as shown in [5], has a nonuniformity of several decibels that corresponds to reflectance peaks nonuniformity of several percents.…”

Design and fabrication of widely tunable sampled grating DFB laser diode integrated with sampled grating distributed Bragg reflector

“…A reconfigurable BSF is proposed with two distinct resonating frequencies [2]. The reconfigurable BPFs with pass-band tuning [3][4][5] are reported. A reconfigurable BPF [6] with separately pass-band edge tuning is presented.…”

Performance of Widely Tunable Multi-Quantum-Well and Bulk Laser Diodes and the Main Limiting Factors

“…In widely tunable TLDs the strongest effect on the output power performance is, however, due to the shapes of the AR net gain g net (λ) and the cavity mirror loss α m (λ) spectra and their mutual positioning with respect to the lasing cavity mode during tuning. Although, in the present paper we have demonstrated this point for a 3-section laser, the effect in question is universal and should be observed in TLDs with various designs of tuning sections [44]- [50]. For example, the 40-nm tuning range in both C-and L-band digital supermode DBR (DS-DBR) TLDs has been reported in [44] and [45], and the output power drop was about 30% when the laser is continuously tuned over each supermode (∼7 nm).…”

Design of widely tunable semiconductor lasers and the concept of binary superimposed gratings (BSG's)

“…For that reason, the amplitudes of peaks in the Fourier spectrum are bigger than that of SG for the same length. As noted in [5], they decay with the number of channels as . Using the same criteria as in (6), the number of channels available with SSG may be found approximately from the equation 7Numerical adjustment of the grating phases (or pitch width) of the subsections makes it possible to construct a SSG with highly uniform amplitude of reflection peaks.…”

“…However, technological implementation of the SSG of desirable uniformity requires extremely precise lithography to reproduce the designed ultrafine grating phase shifts of each section correctly. Not surprisingly, the measured transmittance spectrum, as shown in [5], has a nonuniformity of several decibels that corresponds to reflectance peaks nonuniformity of several percents.…”

Design and fabrication of widely tunable sampled grating DFB laser diode integrated with sampled grating distributed Bragg reflector

“…A reconfigurable BSF is proposed with two distinct resonating frequencies [2]. The reconfigurable BPFs with pass-band tuning [3][4][5] are reported. A reconfigurable BPF [6] with separately pass-band edge tuning is presented.…”

Performance of Widely Tunable Multi-Quantum-Well and Bulk Laser Diodes and the Main Limiting Factors

“…In widely tunable TLDs the strongest effect on the output power performance is, however, due to the shapes of the AR net gain g net (λ) and the cavity mirror loss α m (λ) spectra and their mutual positioning with respect to the lasing cavity mode during tuning. Although, in the present paper we have demonstrated this point for a 3-section laser, the effect in question is universal and should be observed in TLDs with various designs of tuning sections [44]- [50]. For example, the 40-nm tuning range in both C-and L-band digital supermode DBR (DS-DBR) TLDs has been reported in [44] and [45], and the output power drop was about 30% when the laser is continuously tuned over each supermode (∼7 nm).…”

Design of widely tunable semiconductor lasers and the concept of binary superimposed gratings (BSG's)

“…For that reason, the amplitudes of peaks in the Fourier spectrum are bigger than that of SG for the same length. As noted in [5], they decay with the number of channels as . Using the same criteria as in (6), the number of channels available with SSG may be found approximately from the equation 7Numerical adjustment of the grating phases (or pitch width) of the subsections makes it possible to construct a SSG with highly uniform amplitude of reflection peaks.…”

“…However, technological implementation of the SSG of desirable uniformity requires extremely precise lithography to reproduce the designed ultrafine grating phase shifts of each section correctly. Not surprisingly, the measured transmittance spectrum, as shown in [5], has a nonuniformity of several decibels that corresponds to reflectance peaks nonuniformity of several percents.…”

Design and fabrication of widely tunable sampled grating DFB laser diode integrated with sampled grating distributed Bragg reflector

“…A reconfigurable BSF is proposed with two distinct resonating frequencies [2]. The reconfigurable BPFs with pass-band tuning [3][4][5] are reported. A reconfigurable BPF [6] with separately pass-band edge tuning is presented.…”