JIS-C-5933-1993-R2005-ENG.pdf

J I S CX5933 93 4933608 0536880 535 UDC 621.31 6.545.09.001.4:666.189.21:666.192.22 J IS JAPANESE INDUSTRIAL STANDARD . 4 Test methods of optical isolators for fiber optic transmission JIS C 5 9 3 3 - 1 9 9 3 Translated and Published by Japanese Standards Association Printed in Japan 7 s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS Ca5933 93 4733608 05Lb88L 471 In thc cvcnt of any doubt arising, the original Standard in Japancsc is to be final authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS Ca5933 93 = Y933608 0536882 308 UDC 621. 316. 545. 09. 001. 4: 666. 189. 21: 666. 192.22 JAPANESE INDUSTRIAL STANDARD Jrs Test methods of optical isolators C 5933-1993 for fiber optic transmission 1. Scope isolators for use in fiber optic transmission employing silica glass single-mode optical fibers (hereafter referred to as “optical isolators”). This Japanese Industrial Standard specifies test methods of optical I Remarks: The following Standards are cited in this Standard: JIS C O010 JIS C 0040 JIS C 0041 JIS C 5900 JIS C 5901 JIS C 5932 JIS Z 8120 Environmental testing Part 1: General and guidance Basic environmental testing procedures Part 2: Tests, Test Fc and guidance: Vibration (sinusoidal) Basic environmental testing procedures Part 2: Tests, Test Ea: Shock General rules of passive devices for fiber optic transmission Test methods of passive devices for fiber optic transmission General rules of optical isolators for fiber optic transmission Glossary of optical terms 2. Definitions tions specified in JIS C 5900, JIS C 5901, JIS C 5932 and JIS Z 8120, the following definitions shall apply: For the purpose of this Standard, in addition to the defini- (1) principal axis direction The direction corresponding to two planes of polarization at right angles preserved in a polarization-maintaining optical fiber. Such a mode that the electromagnetic field is confined in the cladding and core due to existence of a layer with lower refractive index outside the cladding. An optical element which can rotate the direction of polarization in the output linearly polarized light at least 180” relative to the incident linearly polarized light. (2) cladding mode e (3) polarization rotator 6 3. Test conditions 3.1 Standard conditions Unless otherwise specified, the tests and measure- ments shall be carried out under the conditions specified in 5.3 of JIS C O010 (temperature 15°C to 35OC, relative humidity 25 % to 75 % and air pressure 86 kPa to 106 kPa). If any doubt arises on the decision based on the measured values under the standard conditions or the test conditions are especially re- quested, the test shall be carried out under the conditions of 3.3 or under the requested conditions. The reference conditions when the conversion is individually specified shall be a as stated in 3.2. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 C 5933-1993 If it is difficult to carry out the measurements under the standard conditions, the test and measurements may be carried out under the conditions other than the standard conditions unless any doubt arises on the decision. because the performances changes with the temperature. The temperature in the test conditions shall be clearly stated in the test report 3.2 Reference conditions The reference conditions shall be the conditions specified in 5.1 of JIS C O010 (temperature 20°C and air pressure 101.3 kPa). However, only the temperature may be employed as the reference condition. 3.3 Referee conditions table of 5.2 of JIS C O010 (temperature 20 I 2“C, relative humidity 60 % to The referee conditions shall be the conditions in the 70 % and air pressure 86 kPa to 106 kPa). 3.4 Conditions of test place The test place shall be sufficiently cleaned so that the place is free from dirt and dust. Further, sufficient protective means shall be provided to avoid influence of external magnetic field due to external magnetic substance on the measurements. 4, Test apparatus and equipment Remarks: The joint between the test apparatus and test equipment shall be brought to non reflective state by means of matching oil or the like. 4.1 Light source stabilized output shall be employed as the light source. Unless otherwise specified, the laser stated below with The output light is a linearly polarized light. Its full width half maximum (FWHM) spectral linewidth is so small as not to affect the measurement. Its output optical power does not exceed the maximum incident optical power of the optical isolator under test (specimen). linewidth shall be clearly stated in the test report. The light source shall be stable in its central wavelength, FWHM spectral linewidth and output optical power over a time period sufficiently longer than the duration of measurement. The kind of light source, the central wavelength and the FWHM spectral Optical power meter Unless otherwise specified, an optical power meter with a linearity error not exceeding f 0.2 dB in the measuring range shall be used. If another meter is used, the accuracy shall be clearly stated in the test report. The light detector element shall have polarization independence over all the light receiving plane, shall have uniform sensitivity distribution, and its effective diameter of sensitive area is sufficiently large as compared with the distribution of incident light at the light receiving plane. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S CX5933 93 = 4933608 05Lb884 180 = 3 C 5933-1993 4.3 Measuring optical fiber Optical fibers which satisfy the requirements given below shall be used as the measuring optical fiber. (1) (2) Its cladding mode can be sufficiently stripped. The length of fiber shall be such that the optical loss of the measuring optical fiber itself is negligible as compared with the optical loss of the optical isolator under test. The output light shall be linearly polarized one when a linearly polarized light is launched into the fiber. (3) The parameters which specify the structure of measuring optical fiber shall be clearly stated in the test report. 5. Appearance and marking tests 5.1 Appearance The appearance test shall be made by visual check. 5.2 Marking The marking test shall be carried out by visual check. 6. ODtical Derformance test 6.1 Insertion loss 6.1.1 Equipment The equipment shall be as follows: (1) Light source As specified in 4.1. (2) Optical power meter As specified in 4.2. (3) Measuring optical fiber As specified in 4.3. 6.1.2 Preparation expose the specimen to the measuring temperature for 30 min or more. Arrange the measuring system so that the factors which will affect the measurements such as excess ventilation and direct heat radiation from the sunlight or other heat source to the specimen are excluded before and after the measurement. If it is necessary to avoid dispute on the measured results, Keep the optical incident and emergent parts clean without dust. 6.1.3 Test with the method stated below. Measure the insertion loss of an optical isolator in accordance (1) Arrange the measuring system as illustrated in Fig. 1, rotate the polariza- tion direction on the incident side at least through 180“ by the polarization rotator, and measure the incident optical power Pi at each angle of rota- tion. Make the configuration of Fig. 2 by inserting the specimen in forward direction in the configuration of Fig. 1, and measure the output optical power Pa at each angle where Pi was measured. Calculate the insertion loss at each angle from the following formula: (2) (3) e Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*5933 93 m 4733608 0536885 017 m Measuring optical fiber Q v I- Light source Joint 4 C 5933-1993 optical fiber % Polarization rotator v n Joint Li = -10 loglo- Po P i Measuring optical fiber a A Joint where, L i : insertion loss (dB) PI : incident optical power (W) PZ : output optical power (w) optical fiber 4, 3 - =:x Polarization rotator Joint Joint 2 (4) The insertion loss entered in the test report shall be the minimum value of insertion loss at each angle for polarization-dependent optical isolators and the maximum value for polarization-independent optical isolators. Calculate the difference between the maximum value and minimum value of insertion loss at each angle, as the polarization dependence of a polarization-independent optical isolator. Fig. 1. Measurement of incident optical power Fig. 2. Measurement of emergent optical power Remarks: In Fig. 2, the joint state when input and output ports of the specimen are pigtail ports, but there are 9 kinds of joint states corresponding to combination of pigtail, plug and receptacle used as the input and output ports as illustrated in Fig 3. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Cg5933 93 4933608 05Lb8Bb T53 = 5 C 5933-1993 Fig. 3. Joint states of specimen (1) Receptacle to receptacle Specimen Tp (2) Receptacle to plug Specimen (3) Receptacle to pigtail Specimen El-=- (4) Plug to receptacle (5) Plug to plug (6) Plug to pigtail (7) Pigtail to receptacle (8) Pigtail to plug Specimen a Specimen 44 Specimen 44 (9) Pigtail to pigtail Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Cm5733 73 m Y733608 0516887 î î T m 6 C 5933-1993 6.2 Isolation and isolation ratio 6.2.1 Equipment The equipment shall be as follows: (1) Light source As specified in 4.1. (2) Optical power meter As specified in 4.2. (3) Measuring optical fiber As specified in 4.3. 6.2.2 Preparation As specified in 6.1.2, 6.2.3 Test accordance with the method stated below. Measure the isolation and isolation ratio of the optical isolator in (1) Arrange the measuring system as illustrated in Fig. 1, rotate the direction of polarization on the incident side at least through 180“ by polarization rotator, and measure the incident optical power P3 at each angle of rotation. If the tests for isolation and isolation ratio are carried out succes- sively to the insertion loss test, the values of P l may be used as the values of P3. Make the configuration of Fig. 4 by inserting the specimen in reverse direction in the configuration of Fig. 1, and measure the output optical power P d at each angle where P3 was measured. Calculate the isolation at each angle of linearly polarized light from the following formula: (2) (3) L2 = -10 1ogio- P4 P3 where, LZ : isolation (dB) P 3 : incident optical power (W) Pq : output optical power (W) (4) The isolation entered in the test report shall be the minimum value of isolation at each angle for both polarization-dependent optical isolator and polarization-independent optical isolator. When isolation for circularly polarized light is indicated for polarization-dependent optical isolator, clearly state such a fact in the test report. In this case, the sum of the measured value for linearly polarized light plus 3 dB is the value of isola- tion for circularly polarized light. Calculate the isolation ratio from the following formula: (5) L3 = L2 - Li where, L3 : isolation ratio (dB) LI : insertion loss (dB) L2 : isolation (dB) Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S CX5933 93 4933608 0536888 826 optical fiber 0 , , u , Polarization ,I Joint Joint Light source rotator 7 C 5933-1993 optical fiber ) % n Y - E A ' Joint Fig. 4. Measurement of output optical power Remarks: As for the joint states of specimen, there are 9 kinds of joint states same as the case of insertion loss measurement as illustrated in Fig. 3. 6.3 Return loss 6.3.1 Equipment The equipment shall be as follows: Light source As specified in 4.1. (2) Optical power meter As specified in 4.2. (3) Measuring optical fiber As specified in 4.3. (4) Optical directional coupler An optical directional coupler which has such functions that the signal is transmitted from its input port to common port and from common port to output port, but the signal is isolated between its input port and output port, and which has an isolation between input and output ports with sufficient margin against the return loss of the specimen shall be used. If there is not sufficient margin against the return loss of specimen, clearly state the isolation of optical directional coupler in the test report. 6.3.2 Preparation As specified in 6.1.2. 6.3.3 Test the method stated below. Measure the return loss of an optical isolator in accordance with a (1) Arrange the measuring system as illustrated in Fig. 5, rotate the direction of polarization on the incidnet side at least through 180“ by polarization rotator, and measure the total -reflected optical power Pg at each angle. Make the configuration of Fig. 6 by inserting the specimen in forward direction instead of the total reflective termination in Fig. 5, and measure the reflected optical power PS at each angle where P g was measured. Calculate the return loss at each angle from the following formula: (2) (3) L4 = -10 log,op, P6 where, L4 : return loss (dB) PS : total reflected optical power (W) Ps : reflected optical power (W) Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/