Abstract

An optical isolator for semiconductor lasers, consisting of a polarizer and a quarterwave plate, was investigated experimentally. It was assembled in a compact laser-to-fiber coupling module. Experiment showed forward loss of 1.15 dB, backward loss of 24.8 dB, and rotative tolerance of 2.4 deg for 1 dB down. The length of the module is 43.2 mm. The coupling efficiency to a graded-index multimode fiber is 37.5%. The extinction ratio is improved by 6.75 dB. The suppression effect on the influence of reflected light was investigated, using the assembled module.

© 1980 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. C. Risch, C. Voumard, F. K. Reinhart, R. Salathe, IEEE J. Quantum Electron. QE-13, 692 (1977).
    [CrossRef]
  2. A. Shibukawa, A. Katsui, H. Iwamura, S. Hayashi, Electron. Lett. 13, 721 (1977).
    [CrossRef]
  3. M. Seki, A. Ueki, K. Kobayashi, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper WD2.
  4. K. Wakita, M. Fukuda, K. Hori, O. Hasegawa, R. Namazu, Paper of Technical Group on Optics and Quantum Electronics, IECE of Japan, OQE78-107 (1978) (in Japanese).
  5. T. Horimatsu, M. Sasaki (to be published).
  6. Y. Ohguchi, Y. Ueno, S. Samejima, S. Kurokawa, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper TuD2.

1977 (2)

C. Risch, C. Voumard, F. K. Reinhart, R. Salathe, IEEE J. Quantum Electron. QE-13, 692 (1977).
[CrossRef]

A. Shibukawa, A. Katsui, H. Iwamura, S. Hayashi, Electron. Lett. 13, 721 (1977).
[CrossRef]

Fukuda, M.

K. Wakita, M. Fukuda, K. Hori, O. Hasegawa, R. Namazu, Paper of Technical Group on Optics and Quantum Electronics, IECE of Japan, OQE78-107 (1978) (in Japanese).

Hasegawa, O.

K. Wakita, M. Fukuda, K. Hori, O. Hasegawa, R. Namazu, Paper of Technical Group on Optics and Quantum Electronics, IECE of Japan, OQE78-107 (1978) (in Japanese).

Hayashi, S.

A. Shibukawa, A. Katsui, H. Iwamura, S. Hayashi, Electron. Lett. 13, 721 (1977).
[CrossRef]

Hori, K.

K. Wakita, M. Fukuda, K. Hori, O. Hasegawa, R. Namazu, Paper of Technical Group on Optics and Quantum Electronics, IECE of Japan, OQE78-107 (1978) (in Japanese).

Horimatsu, T.

T. Horimatsu, M. Sasaki (to be published).

Iwamura, H.

A. Shibukawa, A. Katsui, H. Iwamura, S. Hayashi, Electron. Lett. 13, 721 (1977).
[CrossRef]

Katsui, A.

A. Shibukawa, A. Katsui, H. Iwamura, S. Hayashi, Electron. Lett. 13, 721 (1977).
[CrossRef]

Kobayashi, K.

M. Seki, A. Ueki, K. Kobayashi, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper WD2.

Kurokawa, S.

Y. Ohguchi, Y. Ueno, S. Samejima, S. Kurokawa, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper TuD2.

Namazu, R.

K. Wakita, M. Fukuda, K. Hori, O. Hasegawa, R. Namazu, Paper of Technical Group on Optics and Quantum Electronics, IECE of Japan, OQE78-107 (1978) (in Japanese).

Ohguchi, Y.

Y. Ohguchi, Y. Ueno, S. Samejima, S. Kurokawa, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper TuD2.

Reinhart, F. K.

C. Risch, C. Voumard, F. K. Reinhart, R. Salathe, IEEE J. Quantum Electron. QE-13, 692 (1977).
[CrossRef]

Risch, C.

C. Risch, C. Voumard, F. K. Reinhart, R. Salathe, IEEE J. Quantum Electron. QE-13, 692 (1977).
[CrossRef]

Salathe, R.

C. Risch, C. Voumard, F. K. Reinhart, R. Salathe, IEEE J. Quantum Electron. QE-13, 692 (1977).
[CrossRef]

Samejima, S.

Y. Ohguchi, Y. Ueno, S. Samejima, S. Kurokawa, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper TuD2.

Sasaki, M.

T. Horimatsu, M. Sasaki (to be published).

Seki, M.

M. Seki, A. Ueki, K. Kobayashi, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper WD2.

Shibukawa, A.

A. Shibukawa, A. Katsui, H. Iwamura, S. Hayashi, Electron. Lett. 13, 721 (1977).
[CrossRef]

Ueki, A.

M. Seki, A. Ueki, K. Kobayashi, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper WD2.

Ueno, Y.

Y. Ohguchi, Y. Ueno, S. Samejima, S. Kurokawa, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper TuD2.

Voumard, C.

C. Risch, C. Voumard, F. K. Reinhart, R. Salathe, IEEE J. Quantum Electron. QE-13, 692 (1977).
[CrossRef]

Wakita, K.

K. Wakita, M. Fukuda, K. Hori, O. Hasegawa, R. Namazu, Paper of Technical Group on Optics and Quantum Electronics, IECE of Japan, OQE78-107 (1978) (in Japanese).

Electron. Lett. (1)

A. Shibukawa, A. Katsui, H. Iwamura, S. Hayashi, Electron. Lett. 13, 721 (1977).
[CrossRef]

IEEE J. Quantum Electron. (1)

C. Risch, C. Voumard, F. K. Reinhart, R. Salathe, IEEE J. Quantum Electron. QE-13, 692 (1977).
[CrossRef]

Other (4)

M. Seki, A. Ueki, K. Kobayashi, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper WD2.

K. Wakita, M. Fukuda, K. Hori, O. Hasegawa, R. Namazu, Paper of Technical Group on Optics and Quantum Electronics, IECE of Japan, OQE78-107 (1978) (in Japanese).

T. Horimatsu, M. Sasaki (to be published).

Y. Ohguchi, Y. Ueno, S. Samejima, S. Kurokawa, in Digest of Topical Meeting on Optical Fiber Communication (Optical Society of America, Washington, D.C., 1979), paper TuD2.

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (7)

Fig. 1
Fig. 1

(a) Schematic configuration of the optical isolator for semiconductor lasers. (b) Optical arrangement for the fundamental experiment of the optical isolator: LD, laser; L, objective lens; P. polarizer (Glan-Thompson prism); Q, quarterwave plate; M1,M2, mirrors.

Fig. 2
Fig. 2

The measurement of the circularity of the circularly polarized wave after the quarterwave plate for different wavelength lasers. The intensity of the output beam is plotted for rotating the angle of the analyzer. The direction of the polarizer is horizontal. (The radius of each curve is not normalized to avoid overhuddling. The quarterwave plate used consists of two plates to cancel the optical activity. The size is 4 × 4 × 3 mm3.)

Fig. 3
Fig. 3

The degradation of the backward loss for the rotative deviation of the quarterwave plate from 45° and for the deviation of the backward loss. The dashed line indicates the experimental result for the rotative deviation.

Fig. 4
Fig. 4

The structure of the laser-to-fiber coupling module with the optical isolator.

Fig. 5
Fig. 5

The current–light output characteristics of the laser output and the fiber output.

Fig. 6
Fig. 6

The laser-to-fiber module including the optical isolator.

Fig. 7
Fig. 7

The current–backward light output characteristics with and without the reflection plug: (a) for the module with the optical isolator (two curves almost coincide in one line); (b) for the module without the isolator. The reduction of the threshold current is observed.

Equations (10)

Equations on this page are rendered with MathJax. Learn more.

( n e - n o ) d o = λ 0 / 4 + m λ 0 ,
E X = E 0 cos ω t ,
E Y = 0 ,
E x = E 0 cos θ cos ( ω t - Γ ) ,
E y = E 0 sin θ cos ω t ,
P B , IN = r E x 2 + r E y 2 = r 2 E 0 2 ,
E r X = r E 0 cos 2 θ cos ( ω t - 2 Γ ) + r E 0 sin 2 θ cos ω t = r E 0 k cos ( ω t - δ ) ,
k = [ ( cos 2 θ cos 2 Γ + sin 2 θ ) 2 + ( cos 2 θ sin 2 Γ ) 2 ] 1 / 2 ,
δ = sin - 1 [ ( cos 2 θ sin 2 Γ ) / k ] .
E r X 2 / P B , IN = k 2 .

Metrics