“…The most common way of fabricating such a tapered fiber is by heating and stretching a section of standard optical fiber in a flame. [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] The flame can either be stationary, 24,28,33 brushed, [18][19][20][21]23,25,29,31,[34][35][36] or one can use a simulated flame brush, [26][27]32 which relies on a stationary flame but oscillating stages. Most flame setups use either an oxy-butane 33,34 or oxy-hydrogen torch.…”