Fiber Bragg grating technology fundamentals and overview

Journal of Lightwave Technology

Volumn 15, Issue 8, 1997, Pages 1263-1276

  Hill, Kenneth O ^b   Meltz, Gerald ^a,c  

^a IEEE

^b Industry Canada   (Canada)

^c OFT Associates   (United States)

Author keywords

Bragg gratings; Optical fiber devices; Optical fiber dispersion; Optical fiber filters; Optical fiber sensors; Optical planar waveguides and components; Photosensitivity

Indexed keywords

ELECTROMAGNETIC DISPERSION; FIBER OPTIC SENSORS; GAS LASERS; HISTORY; LIGHT REFLECTION; NONLINEAR OPTICS; OPTICAL COMMUNICATION; OPTICAL DESIGN; OPTICAL FIBERS; OPTICAL FILTERS; OPTICAL WAVEGUIDES; PHOTOSENSITIVITY;

FIBER BRAGG GRATING;

DIFFRACTION GRATINGS;

EID: 0031212257     PISSN: 07338724     EISSN: None     Source Type: Journal    
DOI: 10.1109/50.618320     Document Type: Article

References (102)

1. K. O. Hill, Y. Fujii, D. C. Johnson, and B. S. Kawasaki, "Photosensitivity in optical fiber waveguides: Application to reflection filter fabrication," Appl. Phys. Lett., vol. 32, pp. 647-649, 1978.
2. B. S. Kawasaki, K. O. Hill, D. C. Johnson, and Y. Fujii, "Narrow-band Bragg reflectors in optical fibers," Opt. Lett., vol. 3, pp. 66-68, 1978.
3. D. K. W. Lam and B. K. Garside, "Characterization of single-mode optical fiber filters," Appl. Opt., vol. 20, pp. 440-445, 1981.
4. G. Meltz, W. W. Morey, and W. H. Glenn, "Formation of Bragg gratings in optical fibers by a transverse holographic method," Opt. Lett., vol. 14, pp. 823-825, 1989.
5. I. Bennion, J. A. R. Williams, L. Zhang, S. K., and N. J. Doran, "Tutorial Review, UV-written in-fiber Bragg gratings," Optic. Quantum Electron., vol. 28, pp. 93-135, 1996.
6. 2 preforms: Additional CW experiments and the macroscopic origin of the change in index," J. Phys. D, Appl. Phys., vol. 29, pp. 1842-1856, 1996.
7. A. D. Kersey, "A review of recent developments in fiber optic sensor technology," Optic. Fiber Technol., vol. 2, pp. 291-317, 1996.
8. V. Garino-Canina, " Quelques propriétés optiques de l'oxyde de germanium vitreux dans l'ultraviolet, oxyde pur," Academie des Sciences Comptes Rendus, vol. 237, pp. 593-596, 1958.
9. 2 glasses," Phys. Rev. B, vol. 46, pp. II-445-II-451, 1995.
10. T. Erdogan, V. Mizrahi, P. J. Lemaire, and D. Monroe, "Decay of ultraviolet-induced fiber Bragg gratings," J. Appl. Phys., vol. 76, pp. 73-80, 1994.
11. 2 doped optical fibers," Electron. Lett., vol. 29, pp. 1191-1193, 1993.
12. F. Bilodeau, B. Malo, J. Albert, D. C. Johnson, K. O. Hill, Y. Hibino, M. Abe, and M. Kawachi, "Photosensitization of optical fiber and silica-on-silicon/silica waveguides," Opt. Lett., vol. 18, pp. 953-955, 1993.
13. K. O. Hill, F. Bilodeau, B. Malo, and D. C. Johnson, "Birefringent photosensitivity in monomode optical fiber: Application to the external writing of rocking filters," Electron. Lett., vol. 27, pp. 1548-1550, 1991.
14. 2 fibers," Opt. Lett., vol. 22, pp. 224-226, 1997.
15. 2 preforms," Opt. Mat., vol. 4, pp. 441-449, 1995.
16. K. O. Hill, B. Malo, F. Bilodeau, D. C. Johnson, and J. Albert, "Bragg gratings fabricated in monomode photosensitive optical fiber by UV exposure through a phase mask," Appl. Phys. Lett., vol. 62, pp. 1035-1037, 1993.
17. D. Z. Anderson, V. Mizrahi, T. Erdogan, and A. E. White, "Production of in-fiber gratings using a diffractive optical element," Electron. Lett., vol. 29, pp. 566-568, 1993.
18. M. Matsuhara and K. O. Hill, "Optical-waveguide band-rejection filters: Design," Appl. Opt., vol. 13, pp. 2886-2888, 1974.
19. B. Malo, S. Thériault, D. C. Johnson, F. Bilodeau, J. Albert, and K. O. Hill, "Apodised in-fiber Bragg grating reflectors photoimprinted using a phase mask," Electron. Lett., vol. 31, pp. 223-224, 1995.
20. J. Albert, K. O. Hill, B. Malo, S. Thériault, F. Bilodeau, J. D. C., and L. E. Erickson, "Apodization of the spectral response of fiber Bragg gratings using a phase mask with variable diffraction efficiency," Electron. Lett., vol. 31, pp. 222-223, 1995.
21. T. A. Strasser, P. J. Chandonnet, J. DeMarco, C. E. Soccolich, J. R. Pedrazzani, D. J. DiGiovanni, M. J. Andrejco and D. S. Shenk, "UV-induced fiber grating OADM devices for efficient bandwidth utilization," in Conf. Tech. Dig. Optic. Fiber Commun., OFC'96, 1996, vol. 5, postdeadline paper PD8.
22. K. O. Hill, "Aperiodic distributed-parameter waveguides for integrated optics," Appl. Opt., vol. 13, pp. 1853-1856, 1974.
23. K. O. Hill, B. Malo, K. A. Vineberg, F. Bilodeau, D. C. Johnson, and I. Skinner, "Efficient mode conversion in telecommunication fiber using externally written gratings," Electron. Lett., vol. 26, pp. 1270-1272, 1990.
24. B. Malo, K. O. Hill, F. Bilodeau, D. C. Johnson, and J. Albert, "Point-by-point fabrication of micro-Bragg gratings in photosensitive fiber using single excimer pulse refractive index modification techniques," Electron. Lett., vol. 29, pp. 1668-1669, 1993.
25. A. M. Vengsarkar, P. J. Lemaire, J. B. Judkins, V. Bhatia, T. Erdogan, and J. E. Sipe, "Long-period fiber gratings as band-rejection filters," in Conf. Optic. Fiber Commun., OFC'95, San Diego, CA, 1995.
26. E. M. Dianov, V. I. Karpov, A. S. Kukov, O. I. Medvedkov, A. M. Prokhorov, V. N. Protopopov, and S. A. Vasilév, "Gain spectrum flattening of Erbium-doped fiber amplifier using long-period grating," in Photosensitivity and Quadratic Nonlinearity in Glass Waveguides: Fundamentals and Applications, OSA Tech. Dig. Series, vol. 22, pp. 14-17, 1995.
27. A. M. Vengsarkar, J. R. Pedrazzani, J. B. Judkins, P. J. Lemaire, N. S. Bergano, and C. R. Davidson, "Long-period fiber-grating-based gain equalizers," Opt. Lett., vol. 21, pp. 336-338, 1996.
28. H. Kogelnick, " Filter response of nonuniform almost-periodic gratings," Bell Syst. Tech. J., vol. 55, pp. 109-126, 1976.
29. L. A. Weller-Brophy and D. G. Hall, "Analysis of waveguide gratings: Application of Rouard's method," J. Opt. Soc. Amer. A, vol. 2, pp. 863-871, 1985.
30. M. Yamada and K. Sakuda, " Analysis of almost-periodic distributed feedback slab waveguides via a fundamental matrix approach," Appl. Opt., vol. 26, pp. 3474-3478, 1987.
31. V. Mizrahi and J. E. Sipe, " Optical properties of photosensitive fiber phase gratings," J. Lightwave Technol., vol. 11, pp. 1513-1517, 1993.
32. E. Peral, J. Capmany, and J. Marti, "Iterative solution to the Gel'fand-Levitan-Mar.enko equations and application to synthesis of fiber gratings," IEEE J. Quantum Electron., vol. 32, pp. 2078-2084, 1996.
33. S. J. Hewlett, J. D. Love, G. Meltz, T. J. Bailey, and W. W. Morey, " Coupling characteristics of photo-induced Bragg gratings in depressed and matched cladding fiber," Opt. Quantum Electron., vol. 28, pp. 1641-1654, 1996.
34. W. W. Morey, G. Meltz, J. D. Love and S. J. Hewlett, "Mode-coupling characteristics of UV-written Bragg gratings in depressed-cladding fiber," Electron. Lett., vol. 30, pp. 730-731, 1994.
35. T. A. Strasser, J. R. Pedrazzani, and M. J. Andrejco, " Reflective-mode conversion UV-induced phase gratings in two-mode fiber," in Conf. Optic. Fiber Commun., OFC'97, 1997, OSA Tech. Dig., paper FB3, vol. 6, pp. 348-349.
36. K. O. Hill, F. Bilodeau, B. Malo, T. Kitagawa, S. Thériault, D. C. Johnson, J. Albert, and K. Takiguchi, "Aperiodic in-fiber Bragg gratings for optical fiber dispersion compensation," in Conf. Optic. Fiber Commun., OFC'94, San Jose, CA, 1994.
37. K. O. Hill, S. Thériault, B. Malo, F. Bilodeau, T. Kitagawa, D. C. Johnson, J. Albert, K. Takiguchi, T. Kataoka, and K. Hagimoto, "Chirped in-fiber Bragg grating dispersion compensators: Linearization of the dispersion characteristic and demonstration of dispersion compensation in a 100 km, 10 Gbit/s optical fiber link," Electron. Lett., vol. 30, pp. 1755-1756, 1994.
38. J. A. R. Williams, I. Bennion, K. Sugden, and N. J. Doran, "Fiber dispersion compensation using a chirped in-fire Bragg grating," Electron. Lett., vol. 30, pp. 985-987, 1994.
39. R. Kashyap, S. V. Chernikov, P. F. McKee, and J. R. Taylor, "30 ps chromatic dispersion compensation of 400 fs pulses at 100 Gbits/s in optical fibers using an all fiber photoinduced chirped reflection grating," Electron. Lett., vol. 30, pp. 1078-1080, 1994.
40. K. O. Hill, F. Bilodeau, B. Malo, T. Kitagawa, S. Thériault, D. C. Johnson, J. Albert, and K. Takiguchi, "Chirped in-fiber Bragg grating for compensation of optical-fiber dispersion," Opt. Lett., vol. 19, pp. 1314-1316, 1994.
41. K. O. Hill, B. Malo, F. Bilodeau, S. Thériault, D. C. Johnson, and J. Albert, "Variable-spectral-response optical waveguide Bragg grating filters for optical signal processing," Opt. Lett., vol. 20, pp. 1438-1440, 1995.
42. K. O. Hill, D. C. Johnson, F. Bilodeau, and S. Faucher, "Narrow-bandwidth optical waveguide transmission filters: A new design concept and applications to optical fiber communications," Electron. Lett., vol. 23, pp. 465-466, 1987.
43. D. C. Johnson, K. O. Hill, F. Bilodeau, and S. Faucher, "New design concept for a narrowband wavelength-selective optical tap and combiner," Electron. Lett., vol. 23, pp. 668-669, 1987.
44. F. Bilodeau, K. O. Hill, B. Malo, D. C. Johnson, and J. Albert, "High-return-loss narrowband all-fiber bandpass Bragg transmission filter," IEEE Photon. Technol. Lett., vol. 6, pp. 80-82, 1994.
45. F. Bilodeau, D. C. Johnson, S. Thériault, B. Malo, J. Albert, and K. O. Hill, "An all-fiber dense-wavelength-division multiplexer/demultiplexer using photoimprinted Bragg gratings," IEEE Photon. Technol. Lett., vol. 7, pp. 388-390, 1995.
46. I. Baumann, J. Seifert, W. Nowak, and M. Sauer, "Compact all-fiber add-drop-multiplexer using fiber Bragg gratings," IEEE Photon. Technol. Lett., vol. 8, pp. 1331-1333, 1996.
47. L. Dong, P. Hua, T. A. Birks, L. Reekie, and P. S. J. Russell, "Novel add/drop filters for wavelength-division-multiplexing optical fiber systems using a Bragg grating assisted mismatched coupler," IEEE Photon. Technol. Lett., vol. 8, pp. 1656-1658, 1996.
48. G. Meltz, W. W. Morey, and W. H. Glenn, "In-fiber Bragg grating tap," in Conf. Optic. Fiber Commun., OFC'90, San Francisco, CA, 1990.
49. R. Kashyap, R. Wyatt, and P. F. McKee, "Wavelength flattened saturated erbium amplifier using multiple side-tap Bragg gratings," Electron. Lett., vol. 29, pp. 1025-1026, 1993.
50. R. Kashyap, R. Wyatt, and R. J. Campbell, "Wideband gain flattened erbium fiber amplifier using a photosensitive fiber blazed grating," Electron. Lett., vol. 29, pp. 154-156, 1993.
51. J. Capmany, D. Pastor, and J. Marti', "EDFA gain equalizer employing linearly chirped apodized fiber gratings," Microwave and Optic. Technol. Lett., vol. 12, pp. 158-160, 1996.
52. C. R. Giles, T. Erdogan, and V. Mizrahi, "Simultaneous wavelength-stabilization of 980-nm pump lasers," IEEE Photon. Technol. Lett., vol. 6, pp. 907-909, 1994.
53. B. F. Ventrudo, G. A. Rogers, G. S. Lick, D. Hargreaves, and T. N. Demayo, "Wavelength and intensity stabilization of 980 nm diode lasers coupled to fiber Bragg gratings," Electron. Lett., vol. 30, pp. 2147-2149, 1994.
54. C. E. Soccolich, V. Mizrahi, T. Erdogan, P. J. LeMaire, and P. Wyscoki, "Gain enhancement in EDFA's by using fiber-grating pump reflectors," in Conf. Optic. Fiber Commun., OFC'94, San Jose, CA, 1994.
55. V. L. da Silva, P. B. Hansen, L. Eskildsen, D. L. Wilson, S. G. Grubb, V. Mizrahi, W. Y. Cheung, T. Erdogan, T. A. Strasser, J. E. J. Alphonsus, S. J. R., and D. J. DiGiovanni, "15.3 dB power budget improvement by remotely pumping an EDFA with a fiber-grating pump reflector," in Conf. Optic. Fiber Commun., OFC'95, San Diego, CA, 1995.
56. K. Hogari, Y. Miyajima, S. Furukawa, N. Tomita, K. Tomiyama, and M. Ohashi, "Wideband and highly reflective step-chirped fiber grating filter embedded in an optical fiber connector," Electron. Lett., vol. 32, pp. 1230-1231, 1996.
57. M. Shigehara, T. Satoh, A. Inoue, and Y. Hattori, "Optical fiber identification system using fiber Bragg gratings," in Conf. Optic. Fiber Commun., OFC'95, San Jose, CA, 1995.
58. C.-K. Chan, F. Tong, L.-K. Chen, J. Song, and D. Lam, "A practical passive surveillance scheme for optically amplified passive branched optical networks," IEEE Photon. Technol. Lett., vol. 9, pp. 526-528, 1997.
59. S. G. Grubb, T. Erdogan, V. Mizrahi, T. Strasser, W. Y. Cheung, W. A. Reed, P. J. Lemaire, A. E. Miller, S. G. Kosinski, G. Nykolak, and P. C. Becker, "1.3 μm cascaded Raman amplifier in germanosilicate fibers," in OSA Topic. Meeting, Optic. Amplifiers and Their Applications, Breckenridge, CO, 1994.
60. 3+ fiber laser utilizing intra-core Bragg reflectors," Electron. Lett., vol. 26, pp. 1829-1830, 1990.
61. 3+ fiber laser," IEEE Photon. Technol. Lett., vol. 3, pp. 1077-1078, 1991.
62. G. A. Ball and W. H. Glenn, "Design of a single-mode linear-cavity erbium fiber laser utilizing Bragg reflectors," J. Lightwave Technol., vol. 10, pp. 1338-1343, 1992.
63. G. A. Ball, W. W. Morey, and W. H. Glenn, "Standing-wave monomode erbium fiber laser," IEEE Photon. Technol. Lett., vol. 3, pp. 613-615, 1991.
64. G. A. Ball, W. H. Glenn, W. W. Morey, and P. K. Cheo, "Modeling of short, single-frequency, fiber lasers in high-gain fiber," IEEE Photon. Technol. Lett., vol. 5, pp. 649-651, 1993.
65. G. A. Ball, G. Hull-Allen, C. Holton, and W. W. Morey, "Low noise single frequency linear fiber laser," Electron. Lett., vol. 29, pp. 1623-1625, 1993.
66. 3+-doped fiber laser," Electronics Letters, vol. 31, pp. 1445-1446, 1995.
67. G. A. Ball and W. W. Morey, "Continuously tunable single-mode erbium fiber laser," Opt. Lett., vol. 17, pp. 420-422, 1992.
68. _, "Compression-tuned single-frequency Bragg fiber laser," Opt. Lett., vol. 19, pp. 1979-1981, 1994.
69. J. D. Minelly, A. Galvanauskas, M. E. Fermann, and D. Haner, "Femtosecond pulse amplification in cladding-pumped fibers," Opt. Lett., vol. 20, pp. 1797-1799, 1995.
70. A. Galvanauskas, P. A. Krug, and D. Harter, "Nanosecond-to-picosecond pulse compression with fiber gratings in a compact fiber-based chirped-pulse-amplification system," Opt. Lett., vol. 21, pp. 1049-1051, 1996.
71. M. E. Fermann, K. Sugden, and I, Bennion, "High-power soliton fiber laser based on pulse width control with chirped fiber Bragg gratings," Opt. Lett., vol. 20, pp. 172-174, 1995.
72. D. M. Bird, J. R. Armitage, R. Kashyap, R. M. A. Fatah, and K. H. Cameron, "Narrow line semiconductor laser using fiber grating," Electron. Lett., vol. 27, pp. 1115-1116, 1991.
73. P. A. Morton, V. Mizrahi, S. G. Kosinski, L. F. Mollenauer, T. Tanbun-Ek, R. A. Logan, D. L. Coblentz, A. M. Sergent, and K. W. Wecht, "Hybrid soliton pulse source with fiber external cavity and Bragg reflector," Electron. Lett., vol. 28, pp. 561-562, 1992.
74. P. A. Morton, V. Mizrahi, P. A. Andrekson, T. Tanbun-Ek, R. A. Logan, P. Lemaire, D. L. Coblentz, A. M. Sergent, K. W. Wecht, and P. R. Sciortino, Jr., "Mode-locked hybrid soliton pulse source with extremely wide operating frequency range," IEEE Photon. Technol. Lett., vol. 5, pp. 28-31, 1993.
75. S. M. Lord, G. W. Switzer, and M. A. Krainak, "Using fiber gratings to stabilise laser diode wavelength under modulation for atmospheric lidar transmitters," Electron. Lett., vol. 32, pp. 561-563, 1996.
76. 02 mode convertors fabricated in photosensitive fiber: Spectral response," Electron. Lett., vol. 27, pp. 682-684, 1991.
77. G. Meltz, W. W. Morey, W. H. Glenn, and J. D. Farina, "In-fiber Bragg-grating sensors," in Proc. OFS'88, 1988.
78. A. Molony, C. Edge, and I. Bennion, "Fiber grating time delay element for phased array antennas," Electron. Lett., vol. 31, pp. 1485-1486, 1995.
79. H. Zmuda, R. A. Soref, P. Payson, S. Johns, and E. N. Toughlian, "Photonic beamformer for phased array antennas using a fiber grating prism," IEEE Photon. Technol. Lett., vol. 9, pp. 241-243, 1997.
80. R. A. Soref, "Fiber grating prism for true time delay beamsteering," Fiber Integr. Opt., pp. 325-333, 1996.
81. J. L. Cruz, B. Ortega, M. V. Andres, B. Gimeno, D. Pastor, J. Capmany, and L. Dong, "Chirped fiber Bragg gratings for phased-array antennas," Electron. Lett., vol. 33, pp. 545-546, 1997.
82. C. M. de Sterke, N. G. R. Broderick, B. J. Eggleton, and M. J. Steel, "Nonlinear optics in fiber gratings," Optic. Fiber Technol., vol. 2, pp. 253-268, 1996.
83. K. P. Koo and A. D. Kersey, "Optical phase amplification technique for interrogating fiber resonator sensors," in Conf. Lasers Electro-Opt. CLEO'94, Anaheim, CA, 1994.
84. T. Erdogan, A. Partovi, V. Mizrahi, P. J. Lemaire, W. L. Wilson, T. A. Strasser, and A. M. Glass, "Volume gratings for holographic storage applications written in high-quality germanosilicate glass," Appl. Opt., vol. 34, pp. 6738-6743, 1995.
85. K. O. Hill, T. Kitagawa, S. Thériault, F. Bilodeau, D. C. Johnson, B. Malo, and J. Albert, "Novel applications of photosensitivity in Gedoped silica: Bragg grating matched filtering for optical fiber dispersion compensation and multilayer optical storage medium," in 7th Annu. Meeting, IEEE Lasers and Electro-Opt. Soc., LEOS'94, Boston, MA, 1994.
86. B. Malo, F. Bilodeau, D. C. Johnson, and K. O. Hill, " Rocking filters written in photosensitive birefringent fiber: Suppression of sidelobes in filter wavelength response," in Conf. Optic. Fiber Commun., OFC'92, 1992, OSA Tech. Dig. vol. 5, postdeadline paper PD23, pp. 404-407.
87. G. Meltz, " Overview of fiber grating-based sensors," in Proc. SPIE, Distributed and Muliplexed Sensors VI, 1996, vol. SPIE-2838, pp. 2-23.
88. A. D. Kersey, M. A. Davis, T. A. Berkoff, D. G. Bellemore, K. P. Koo, and R. T. Jones, "Progress toward the development of practical fiber Bragg grating instrumentation systems," in Proc. SPIE, Fiber Optic and Laser Sensors XIV, 1996, vol. SPIE-2839, pp. 40-64.
89. W. W. Morey, G. Meltz, and J. M. Weiss, " Recent advances in fiber grating sensors for utility industry applications," in Proc. SPIE, Self Calibrated Intelligent Optical Sensors and Systems, 1995, vol. SPIE-2594, pp. 90-98.
90. _, "Evaluation of a fiber Bragg grating hydrostatic pressure sensor," in Proc. 8th Optic. Fiber Sensor Conf., 1992, postdeadline paper PD4.
91. G. Meltz and W. W. Morey, "Photoinduced refractivity in germanosilicate waveguides," in Proc. Integr. Photon. Res. Conf., 1994, postdeadline paper PD6, pp. PD6-1-PD6-4.
92. 3+-doped planar waveguide laser," in Proc. Optic. Fiber Commun. Conf., OFC'94, San Jose, CA, 1994.
93. T. A. Strasser, T. Erdogan, A. E. White, V. Mizrahi, and P. J. Lemaire, "Ultraviolet laser fabrication of strong, nearly polarization-independent Bragg reflectors in germanium-doped silica waveguides on silica substrates," Appl. Phys. Lett., vol. 65, pp. 3308-3310, 1994.
94. G. D. Maxwell, B. J. Ainslie, D. L. Williams, and R. Kashyap, "UV written 13 dB reflection filters in hydrogenated low loss planar silica waveguides," Electron. Lett., vol. 29, pp. 425-426, 1993.
95. D. Bosc, B. Loisel, M. Moisan, N. Devoldere, F. Legall, and A. Rolland, "Temperature and polarization insensitive Bragg gratings realized on silica waveguide on silicon," Electron. Lett., vol. 33, pp. 134-136, 1997.
96. R. Kashyap, G. D. Maxwell, and B. J. Ainslie, "Laser-trimmed four-port bandpass filter fabricated in single-mode photosensitive Ge-doped planar waveguide," IEEE Photon. Technol Lett., vol. 5, pp. 191-194, 1993.
97. M. Svalgaard, C. V. Poulsen, A. Bjarklev, and O. Poulsen, "Direct UV writing of buried singlemode channel waveguides in Ge-doped silica films," Electron. Lett., vol. 30, pp. 1401-1403, 1994.
98. 3+-doped silica-based planar waveguide laser with integrated photo-imprinted Bragg reflectors," Electronics Letters, vol. 30, pp. 1311-1312, 1994.
99. G. E. Kohnke, T. Erdogan, T. A. Strasser, A. E. White, M. A. Milbrodt. C. H. Henry, and E. J. Laskowski, "Planar waveguide Mach-Zender bandpass filter fabricated with single exposure UV-induced gratings," in OFC'96, Optic. Fiber Commun., San Jose, CA, 1996.
100. T. Tanaka, H. Takahashi, M. Oguma, T. Hashimoto, Y. Hibino, Y. Yamada, Y. Itaya, J. Albert, and K. O. Hill, "External cavity laser composed of laser diode and UV written grating integrated on Si," Electron. Lett., vol. 32, pp. 1202-1203, 1996.
101. G. D. Maxwell, R. Kashyap, G. Sherlock, J. V. Collins, and B. J. Ainslie, "Demonstration of a semiconductor external cavity laser using a UV written grating in a planar silica waveguide," Electron. Lett., vol. 30, pp. 1486-1487, 1994.
102. G. D. Maxwell and B. J. Ainslie, "Demonstration of a directly written directional coupler using UV-induced photosensitivity in a planar silica waveguide," Electron. Lett., vol. 31, pp. 95-96, 1995.